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Plant function and evolutionary biology
REVIEW

Hormonal regulation of cereal endosperm development with a focus on rice (Oryza sativa)

Mafroz A. Basunia A and Heather M. Nonhebel https://orcid.org/0000-0001-9055-3095 A B
+ Author Affiliations
- Author Affiliations

A School of Science and Technology, University of New England, Armidale, NSW 2350, Australia.

B Corresponding author. Email: hnonheb2@une.edu.au

Functional Plant Biology 46(6) 493-506 https://doi.org/10.1071/FP18323
Submitted: 12 December 2018  Accepted: 13 February 2019   Published: 8 April 2019

Abstract

The endosperm of cereal grain forms the staple diet for most of the world’s population, and feeds much of their stock. Grain size and quality are determined largely by events taking place during coenocytic nuclear division, endosperm cellularisation and cell differentiation, and the production of storage molecules. Thus, understanding the complex signalling processes occurring at each of these steps is essential for maintaining and improving our food supply. Here, we critically review evidence for the effects of phytohormones on grain size, as well as hormone homeostasis, signalling and crosstalk. We focus on rice endosperm due to the importance of rice as a food crop and a model grass, as well as its relative neglect in recent reviews; however, data from other cereals are also discussed due to strong evidence for conserved signalling networks operating during grain development. Discussion is restricted to auxin, cytokinin, ethylene, abscisic acid and gibberellin. Our review highlights the need for accurate hormone determinations combined with information on gene expression. We present evidence for separate, localised signalling roles for auxin at different stages of grain development and highlight key research questions for other hormones where much less data are available.

Additional keywords: grain development, grain fill, hormone mutants, hormone crosstalk, plant hormones, TGW6.


References

Abu-Zaitoon YM, Bennett K, Normanly J, Nonhebel HM (2012) A large increase in IAA during development of rice grains correlates with the expression of tryptophan aminotransferase OsTAR1 and a grain‐specific YUCCA. Physiologia Plantarum 146, 487–499.
A large increase in IAA during development of rice grains correlates with the expression of tryptophan aminotransferase OsTAR1 and a grain‐specific YUCCA.Crossref | GoogleScholarGoogle Scholar | 22582989PubMed |

Bai AN, Lu XD, Li DQ, Liu JX, Liu CM (2016) NF-YB1-regulated expression of sucrose transporters in aleurone facilitates sugar loading to rice endosperm. Cell Research 26, 384–388.
NF-YB1-regulated expression of sucrose transporters in aleurone facilitates sugar loading to rice endosperm.Crossref | GoogleScholarGoogle Scholar | 26403192PubMed |

Balzan S, Johal GS, Carraro N (2014) The role of auxin transporters in monocots development. Frontiers of Plant Science 5, 393
The role of auxin transporters in monocots development.Crossref | GoogleScholarGoogle Scholar |

Bandurski RS, Schulze A (1977) Concentration of indole-3-acetic acid and its derivatives in plants. Plant Physiology 60, 211–213.
Concentration of indole-3-acetic acid and its derivatives in plants.Crossref | GoogleScholarGoogle Scholar | 16660061PubMed |

Becraft PW, Yi G (2011) Regulation of aleurone development in cereal grains. Journal of Experimental Botany 62, 1669–1675.
Regulation of aleurone development in cereal grains.Crossref | GoogleScholarGoogle Scholar | 21109580PubMed |

Bernardi J, Lanubile A, Li QB, Kumar D, Kladnik A, Cook SD, Ross JJ, Marocco A, Chourey PS (2012) Impaired auxin biosynthesis in the defective endosperm18 mutant is due to mutational loss of expression in the ZmYuc1 gene encoding endosperm-specific YUCCA1 protein in maize. Plant Physiology 160, 1318–1328.
Impaired auxin biosynthesis in the defective endosperm18 mutant is due to mutational loss of expression in the ZmYuc1 gene encoding endosperm-specific YUCCA1 protein in maize.Crossref | GoogleScholarGoogle Scholar | 22961134PubMed |

Bernardi J, Li QB, Gao Y, Zhao Y, Battaglia R, Marocco A, Chourey PS (2016) The auxin-deficient defective kernel18 (dek18) mutation alters the expression of seed-specific biosynthetic genes in maize. Journal of Plant Growth Regulation 35, 770–777.
The auxin-deficient defective kernel18 (dek18) mutation alters the expression of seed-specific biosynthetic genes in maize.Crossref | GoogleScholarGoogle Scholar |

Bianchetti RE, Cruz AB, Oliveira BS, Demarco D, Purgatto E, Peres LE, Rossi M, Freschi L (2017) Phytochromobilin deficiency impairs sugar metabolism through the regulation of cytokinin and auxin signalling in tomato fruits. Scientific Reports 7, 7822
Phytochromobilin deficiency impairs sugar metabolism through the regulation of cytokinin and auxin signalling in tomato fruits.Crossref | GoogleScholarGoogle Scholar | 28798491PubMed |

Brugière N, Jiao S, Hantke S, Zinselmeier C, Roessler JA, Niu X, Jones RJ, Habben JE (2003) Cytokinin oxidase gene expression in maize is localized to the vasculature, and is induced by cytokinins, abscisic acid, and abiotic stress. Plant Physiology 132, 1228–1240.
Cytokinin oxidase gene expression in maize is localized to the vasculature, and is induced by cytokinins, abscisic acid, and abiotic stress.Crossref | GoogleScholarGoogle Scholar | 12857805PubMed |

Brugière N, Humbert S, Rizzo N, Bohn J, Habben JE (2008) A member of the maize isopentenyl transferase gene family, Zea mays isopentenyl transferase 2 (ZmIPT2), encodes a cytokinin biosynthetic enzyme expressed during kernel development. Plant Molecular Biology 67, 215–229.
A member of the maize isopentenyl transferase gene family, Zea mays isopentenyl transferase 2 (ZmIPT2), encodes a cytokinin biosynthetic enzyme expressed during kernel development.Crossref | GoogleScholarGoogle Scholar | 18311542PubMed |

Calderon Villalobos LI, Lee S, De Oliveira C, Ivetac A, Brandt W, Armitage L, Sheard LB, Tan X, Parry G, Mao HB, Zheng N, Napier R, Kepinski S, Estelle M (2012) A combinatorial TIR1/AFB-Aux/IAA co-receptor system for differential sensing of auxin. Nature Chemical Biology 8, 477–485.
A combinatorial TIR1/AFB-Aux/IAA co-receptor system for differential sensing of auxin.Crossref | GoogleScholarGoogle Scholar | 22466420PubMed |

Cao YY, Chen YH, Chen MX, Wang ZQ, Wu CF, Bian XC, Yang JC, Zhang JH (2016) Growth characteristics and endosperm structure of superior and inferior spikelets of indica rice under high-temperature stress. Biologia Plantarum 60, 532–542.
Growth characteristics and endosperm structure of superior and inferior spikelets of indica rice under high-temperature stress.Crossref | GoogleScholarGoogle Scholar |

Chai C, Subudhi PK (2016) Comprehensive analysis and expression profiling of the OsLAX and OsABCB auxin transporter gene families in rice (Oryza sativa) under phytohormone stimuli and abiotic stresses. Frontiers of Plant Science 7, 593
Comprehensive analysis and expression profiling of the OsLAX and OsABCB auxin transporter gene families in rice (Oryza sativa) under phytohormone stimuli and abiotic stresses.Crossref | GoogleScholarGoogle Scholar |

Chen PW, Chiang CM, Tseng TH, Yu SM (2006) Interaction between rice MYBGA and the gibberellin response element controls tissue-specific sugar sensitivity of α-amylase genes. The Plant Cell 18, 2326–2340.
Interaction between rice MYBGA and the gibberellin response element controls tissue-specific sugar sensitivity of α-amylase genes.Crossref | GoogleScholarGoogle Scholar | 16905658PubMed |

Chen C, Letnik I, Hacham Y, Dobrev P, Ben-Daniel BH, Vanková R, Amir R, Miller G (2014a) Ascorbate peroxidase 6 protects Arabidopsis thaliana desiccating and germinating seeds from stress and mediates crosstalk between ROS, ABA and auxin. Plant Physiology 166, 370–383.
Ascorbate peroxidase 6 protects Arabidopsis thaliana desiccating and germinating seeds from stress and mediates crosstalk between ROS, ABA and auxin.Crossref | GoogleScholarGoogle Scholar | 25049361PubMed |

Chen J, Lausser A, Dresselhaus T (2014b) Hormonal responses during early embryogenesis in maize. Biochemical Society Transactions 42, 325–331.
Hormonal responses during early embryogenesis in maize.Crossref | GoogleScholarGoogle Scholar | 24646239PubMed |

Chen Y, Liu L, Shen Y, Liu S, Huang J, Long Q, Wu W, Yang C, Chen H, Guo X, Cheng Z, Jiang L, Wan J (2015) Loss of function of the cytochrome P450 gene CYP78B5 causes giant embryos in rice. Plant Molecular Biology Reporter 33, 69–83.
Loss of function of the cytochrome P450 gene CYP78B5 causes giant embryos in rice.Crossref | GoogleScholarGoogle Scholar |

Chen C, Begcy K, Liu K, Folsom JJ, Wang Z, Zhang C, Walia H (2016) Heat stress yields a unique MADS box transcription factor in determining seed size and thermal sensitivity. Plant Physiology 171, 606–622.
Heat stress yields a unique MADS box transcription factor in determining seed size and thermal sensitivity.Crossref | GoogleScholarGoogle Scholar | 26936896PubMed |

Choi MS, Koh EB, Woo MO, Piao R, Oh CS, Koh HJ (2012) Tiller formation in rice is altered by overexpression of OsIAGLU gene encoding an IAA-conjugating enzyme or exogenous treatment of free IAA. Journal of Plant Biology 55, 429–435.
Tiller formation in rice is altered by overexpression of OsIAGLU gene encoding an IAA-conjugating enzyme or exogenous treatment of free IAA.Crossref | GoogleScholarGoogle Scholar |

Ciarkowska A, Ostrowski M, Jakubowska A (2018) A serine carboxypeptidase-like acyltransferase catalyzes synthesis of indole-3-acetic (IAA) ester conjugate in rice (Oryza sativa). Plant Physiology and Biochemistry 125, 126–135.
A serine carboxypeptidase-like acyltransferase catalyzes synthesis of indole-3-acetic (IAA) ester conjugate in rice (Oryza sativa).Crossref | GoogleScholarGoogle Scholar | 29448154PubMed |

Daskalova S, McCormac A, Scott N, Van Onckelen H, Elliott M (2007) Effect of seed-specific expression of the ipt gene on Nicotiana tabacum L. seed composition. Plant Growth Regulation 51, 217–229.
Effect of seed-specific expression of the ipt gene on Nicotiana tabacum L. seed composition.Crossref | GoogleScholarGoogle Scholar |

Diaz I, Vicente‐Carbajosa J, Abraham Z, Martínez M, Moneda IL, Carbonero P (2002) The GAMYB protein from barley interacts with the DOF transcription factor BPBF and activates endosperm‐specific genes during seed development. The Plant Journal 29, 453–464.
The GAMYB protein from barley interacts with the DOF transcription factor BPBF and activates endosperm‐specific genes during seed development.Crossref | GoogleScholarGoogle Scholar | 11846878PubMed |

El-Showk S, Ruonala R, Helariutta Y (2013) Crossing paths: cytokinin signalling and crosstalk. Development 140, 1373–1383.
Crossing paths: cytokinin signalling and crosstalk.Crossref | GoogleScholarGoogle Scholar | 23482484PubMed |

Epstein E, Cohen JD, Bandurski RS (1980) Concentration and metabolic turnover of indoles in germinating kernels of Zea mays L. Plant Physiology 65, 415–421.
Concentration and metabolic turnover of indoles in germinating kernels of Zea mays L.Crossref | GoogleScholarGoogle Scholar | 16661204PubMed |

Faix B, Radchuk V, Nerlich A, Hümmer C, Radchuk R, Emery RJN, Keller H, Götz KP, Weschke W, Geigenberger P, Weber H (2012) Barley grains, deficient in cytosolic small subunit of ADP‐glucose pyrophosphorylase, reveal coordinate adjustment of C : N metabolism mediated by an overlapping metabolic‐hormonal control. The Plant Journal 69, 1077–1093.
Barley grains, deficient in cytosolic small subunit of ADP‐glucose pyrophosphorylase, reveal coordinate adjustment of C : N metabolism mediated by an overlapping metabolic‐hormonal control.Crossref | GoogleScholarGoogle Scholar | 22098161PubMed |

Figueiredo DD, Köhler C (2018) Auxin: a molecular trigger of seed development. Genes & Development 32, 479–490.
Auxin: a molecular trigger of seed development.Crossref | GoogleScholarGoogle Scholar |

Forestan C, Meda S, Varotto S (2010) ZmPIN1-mediated auxin transport is related to cellular differentiation during maize embryogenesis and endosperm development. Plant Physiology 152, 1373–1390.
ZmPIN1-mediated auxin transport is related to cellular differentiation during maize embryogenesis and endosperm development.Crossref | GoogleScholarGoogle Scholar | 20044449PubMed |

Gao S, Fang J, Xu F, Wang W, Sun X, Chu J, Cai B, Feng Y, Chu C (2014) A cytokinin oxidase/dehydrogenase gene OsCKX4 integrates cytokinin and auxin signalling to control rice crown root formation. Plant Physiology 165, 1035–1046.
A cytokinin oxidase/dehydrogenase gene OsCKX4 integrates cytokinin and auxin signalling to control rice crown root formation.Crossref | GoogleScholarGoogle Scholar | 24808099PubMed |

Ghorbani Javid M, Sorooshzadeh A, Sanavy S, Allahdadi I, Moradi F (2011) Effects of the exogenous application of auxin and cytokinin on carbohydrate accumulation in grains of rice under salt stress. Plant Growth Regulation 65, 305–313.
Effects of the exogenous application of auxin and cytokinin on carbohydrate accumulation in grains of rice under salt stress.Crossref | GoogleScholarGoogle Scholar |

Goetz M, Vivian-Smith A, Johnson SD, Koltunow AM (2006) AUXIN RESPONSE FACTOR8 is a negative regulator of fruit initiation in Arabidopsis. The Plant Cell 18, 1873–1886.
AUXIN RESPONSE FACTOR8 is a negative regulator of fruit initiation in Arabidopsis.Crossref | GoogleScholarGoogle Scholar | 16829592PubMed |

Habben JE, Bao X, Bate NJ, DeBruin JL, Dolan D, Hasegawa D, Helentjaris TG, Lafitte RH, Lovan N, Mo H, Reimann K, Schussler JR (2014) Transgenic alteration of ethylene biosynthesis increases grain yield in maize under field drought‐stress conditions. Plant Biotechnology Journal 12, 685–693.
Transgenic alteration of ethylene biosynthesis increases grain yield in maize under field drought‐stress conditions.Crossref | GoogleScholarGoogle Scholar | 24618117PubMed |

Hands P, Kourmpetli S, Sharples D, Harris RG, Drea S (2012) Analysis of grain characters in temperate grasses reveals distinctive patterns of endosperm organization associated with grain shape. Journal of Experimental Botany 63, 6253–6266.
Analysis of grain characters in temperate grasses reveals distinctive patterns of endosperm organization associated with grain shape.Crossref | GoogleScholarGoogle Scholar | 23081982PubMed |

Hoshikawa K (1990) Anthesis, fertilization and development of caryopsis. In ‘Science of the Rice Plant, Vol. 1 Morphology’ (Eds T Matsuo, S Shimizu, K Hoshikawa, E Maeda, K Yamazaki) pp. 273–306. (Nobunkyo Press, Tokyo)

Hu YF, Li YP, Zhang J, Liu H, Tian M, Huang Y (2012) Binding of ABI4 to a CACCG motif mediates the ABA-induced expression of the ZmSSI gene in maize (Zea mays L.) endosperm. Journal of Experimental Botany 63, 5979–5989.
Binding of ABI4 to a CACCG motif mediates the ABA-induced expression of the ZmSSI gene in maize (Zea mays L.) endosperm.Crossref | GoogleScholarGoogle Scholar | 23048129PubMed |

Huang H, Xie S, Xiao Q, Wei B, Zheng L, Wang Y, Cao Y, Zhang X, Long T, Li Y, Hu Y, Yu G, Liu H, Liu Y, Huang Z, Zhang J, Huang Y (2016a) Sucrose and ABA regulate starch biosynthesis in maize through a novel transcription factor, ZmEREB156. Scientific Reports 6, 27590
Sucrose and ABA regulate starch biosynthesis in maize through a novel transcription factor, ZmEREB156.Crossref | GoogleScholarGoogle Scholar | 27282997PubMed |

Huang J, Li Z, Zhao D (2016b) Deregulation of the OsmiR160 target gene OsARF18 causes growth and developmental defects with an alteration of auxin signalling in rice. Scientific Reports 6, 29938
Deregulation of the OsmiR160 target gene OsARF18 causes growth and developmental defects with an alteration of auxin signalling in rice.Crossref | GoogleScholarGoogle Scholar | 27444058PubMed |

Ishimaru K, Hirotsu N, Madoka Y, Murakami N, Hara N, Onodera H, Kashiwagi T, Ujiie K, Shimizu BI, Onishi A, Miyagawa H, Katoh E (2013) Loss of function of the IAA-glucose hydrolase gene TGW6 enhances rice grain weight and increases yield. Nature Genetics 45, 707–711.
Loss of function of the IAA-glucose hydrolase gene TGW6 enhances rice grain weight and increases yield.Crossref | GoogleScholarGoogle Scholar | 23583977PubMed |

Itoh JI, Sato Y, Sato Y, Hibara KI, Shimizu-Sato S, Kobayashi H, Takehisa H, Sanguinet KA, Namiki N, Nagamura Y (2016) Genome-wide analysis of spatiotemporal gene expression patterns during early embryogenesis in rice. Development 143, 1217–1227.
Genome-wide analysis of spatiotemporal gene expression patterns during early embryogenesis in rice.Crossref | GoogleScholarGoogle Scholar |

Jain M, Khurana JP (2009) Transcript profiling reveals diverse roles of auxin‐responsive genes during reproductive development and abiotic stress in rice. FEBS Journal 276, 3148–3162.
Transcript profiling reveals diverse roles of auxin‐responsive genes during reproductive development and abiotic stress in rice.Crossref | GoogleScholarGoogle Scholar | 19490115PubMed |

Jain M, Kaur N, Garg R, Thakur JK, Tyagi AK, Khurana JP (2006) Structure and expression analysis of early auxin-responsive Aux/IAA gene family in rice (Oryza sativa). Functional & Integrative Genomics 6, 47–59.
Structure and expression analysis of early auxin-responsive Aux/IAA gene family in rice (Oryza sativa).Crossref | GoogleScholarGoogle Scholar |

Jameson PE, Song J (2016) Cytokinin: a key driver of seed yield. Journal of Experimental Botany 67, 593–606.
Cytokinin: a key driver of seed yield.Crossref | GoogleScholarGoogle Scholar | 26525061PubMed |

Jensen PJ, Bandurski RS (1994) Metabolism and synthesis of indole-3-acetic acid (IAA) in Zea mays (levels of IAA during kernel development and the use of in vitro endosperm systems for studying IAA biosynthesis). Plant Physiology 106, 343–351.
Metabolism and synthesis of indole-3-acetic acid (IAA) in Zea mays (levels of IAA during kernel development and the use of in vitro endosperm systems for studying IAA biosynthesis).Crossref | GoogleScholarGoogle Scholar | 12232333PubMed |

Kobayashi H (2019) Variations of endoreduplication and its potential contribution to endosperm development in rice (Oryza sativa L.). Plant Production Science
Variations of endoreduplication and its potential contribution to endosperm development in rice (Oryza sativa L.).Crossref | GoogleScholarGoogle Scholar |

Kuwano M, Masumura T, Yoshida KT (2011) A novel endosperm transfer cell-containing region-specific gene and its promoter in rice. Plant Molecular Biology 76, 47–56.
A novel endosperm transfer cell-containing region-specific gene and its promoter in rice.Crossref | GoogleScholarGoogle Scholar | 21409497PubMed |

LeClere S, Schmelz EA, Chourey PS (2010) Sugar levels regulate tryptophan-dependent auxin biosynthesis in developing maize kernels. Plant Physiology 153, 306–318.
Sugar levels regulate tryptophan-dependent auxin biosynthesis in developing maize kernels.Crossref | GoogleScholarGoogle Scholar | 20237017PubMed |

Li M, Singh R, Bazanova N, Milligan AS, Shirley N, Langridge P, Lopato S (2008) Spatial and temporal expression of endosperm transfer cell‐specific promoters in transgenic rice and barley. Plant Biotechnology Journal 6, 465–476.
Spatial and temporal expression of endosperm transfer cell‐specific promoters in transgenic rice and barley.Crossref | GoogleScholarGoogle Scholar | 18422887PubMed |

Li Y, Yu G, Lv Y, Long T, Li P, Hu Y, Liu H, Zhang J, Liu Y, Li WC, Huang Y (2018) Combinatorial interaction of two adjacent cis-active promoter regions mediates the synergistic induction of Bt2 gene by sucrose and ABA in maize endosperm. Plant Science 274, 332–340.
Combinatorial interaction of two adjacent cis-active promoter regions mediates the synergistic induction of Bt2 gene by sucrose and ABA in maize endosperm.Crossref | GoogleScholarGoogle Scholar | 30080620PubMed |

Liu L, Tong H, Xiao Y, Che R, Xu F, Hu B, Liang C, Chu J, Li J, Chu C (2015) Activation of Big Grain1 significantly improves grain size by regulating auxin transport in rice. Proceedings of the National Academy of Sciences of the United States of America 112, 11102–11107.
Activation of Big Grain1 significantly improves grain size by regulating auxin transport in rice.Crossref | GoogleScholarGoogle Scholar | 26283354PubMed |

Liu J, Moore S, Chen C, Lindsey K (2017) Crosstalk complexities between auxin, cytokinin and ethylene in Arabidopsis root development: from experiments to systems modelling, and back again. Molecular Plant 10, 1480–1496.
Crosstalk complexities between auxin, cytokinin and ethylene in Arabidopsis root development: from experiments to systems modelling, and back again.Crossref | GoogleScholarGoogle Scholar | 29162416PubMed |

Locascio A, Roig-Villanova I, Bernardi J, Varotto S (2014) Current perspectives on the hormonal control of seed development in Arabidopsis and maize: a focus on auxin. Frontiers of Plant Science 5, 412
Current perspectives on the hormonal control of seed development in Arabidopsis and maize: a focus on auxin.Crossref | GoogleScholarGoogle Scholar |

Luo M, Taylor JM, Spriggs A, Zhang H, Wu X, Russell S, Singh M, Koltunow A (2011) A genome-wide survey of imprinted genes in rice seeds reveals imprinting primarily occurs in the endosperm. PLOS Genetics 7, e1002125
A genome-wide survey of imprinted genes in rice seeds reveals imprinting primarily occurs in the endosperm.Crossref | GoogleScholarGoogle Scholar | 21731498PubMed |

Lur HS, Setter TL (1993) Role of auxin in maize endosperm development (timing of nuclear DNA endoreduplication, zein expression, and cytokinin). Plant Physiology 103, 273–280.
Role of auxin in maize endosperm development (timing of nuclear DNA endoreduplication, zein expression, and cytokinin).Crossref | GoogleScholarGoogle Scholar | 12231934PubMed |

Ma B, He SJ, Duan KX, Yin CC, Chen H, Yang C, Xiong Q, Song QX, Lu X, Chen HW, Zhang WK, Lu TG, Chen SY, Zhang JS (2013) Identification of rice ethylene-response mutants and characterization of MHZ7/OsEIN2 in distinct ethylene response and yield trait regulation. Molecular Plant 6, 1830–1848.
Identification of rice ethylene-response mutants and characterization of MHZ7/OsEIN2 in distinct ethylene response and yield trait regulation.Crossref | GoogleScholarGoogle Scholar | 23718947PubMed |

Matsuda F, Miyazawa H, Wakasa K, Miyagawa H (2005) Quantification of indole-3-acetic acid and amino acid conjugates in rice by liquid chromatography-electrospray ionization-tandem mass spectrometry. Bioscience, Biotechnology, and Biochemistry 69, 778–783.
Quantification of indole-3-acetic acid and amino acid conjugates in rice by liquid chromatography-electrospray ionization-tandem mass spectrometry.Crossref | GoogleScholarGoogle Scholar | 15849417PubMed |

McAdam EL, Meitzel T, Quittenden LJ, Davidson SE, Dalmais M, Bendahmane AI, Thompson R, Smith JJ, Nichols DS, Urquhart S, Gélinas-Marion A, Aubert G, Ross JJ (2017) Evidence that auxin is required for normal seed size and starch synthesis in pea. New Phytologist 216, 193–204.
Evidence that auxin is required for normal seed size and starch synthesis in pea.Crossref | GoogleScholarGoogle Scholar | 28748561PubMed |

Meng Y, Chen D, Ma X, Mao C, Cao J, Wu P, Chen M (2010) Mechanisms of microRNA-mediated auxin signalling inferred from the rice mutant osaxr. Plant Signaling & Behavior 5, 252–254.
Mechanisms of microRNA-mediated auxin signalling inferred from the rice mutant osaxr.Crossref | GoogleScholarGoogle Scholar |

Michalczuk L, Bandurski RS (1980) UDP-glucose: indoleacetic acid glucosyl transferase and indoleacetyl-glucose: myo-inositol indoleacetyl transferase. Biochemical and Biophysical Research Communications 93, 588–592.
UDP-glucose: indoleacetic acid glucosyl transferase and indoleacetyl-glucose: myo-inositol indoleacetyl transferase.Crossref | GoogleScholarGoogle Scholar | 6446303PubMed |

Miller CO (1961) A kinetin-like compound in maize. Proceedings of the National Academy of Sciences of the United States of America 47, 170–174.
A kinetin-like compound in maize.Crossref | GoogleScholarGoogle Scholar | 16590814PubMed |

Miyazawa Y, Sakai A, Miyagishima SY, Takano H, Kawano S, Kuroiwa T (1999) Auxin and cytokinin have opposite effects on amyloplast development and the expression of starch synthesis genes in cultured bright yellow-2 tobacco cells. Plant Physiology 121, 461–470.
Auxin and cytokinin have opposite effects on amyloplast development and the expression of starch synthesis genes in cultured bright yellow-2 tobacco cells.Crossref | GoogleScholarGoogle Scholar | 10517837PubMed |

Morris RO, Blevins DG, Dietrich JT, Durley RC, Gelvin SB, Gray J, Hommes NG, Kaminek M, Mathews LJ, Meilan R, Reinbott TM, Sayavedra-Soto L (1993) Cytokinins in plant pathogenic bacteria and developing cereal grains. Functional Plant Biology 20, 621–637.
Cytokinins in plant pathogenic bacteria and developing cereal grains.Crossref | GoogleScholarGoogle Scholar |

Muñiz LM, Royo J, Gómez E, Baudot G, Paul W, Hueros G (2010) Atypical response regulators expressed in the maize endosperm transfer cells link canonical two component systems and seed biology. BMC Plant Biology 10, 84
Atypical response regulators expressed in the maize endosperm transfer cells link canonical two component systems and seed biology.Crossref | GoogleScholarGoogle Scholar | 20459670PubMed |

Naik PK, Mohapatra PK (2000) Ethylene inhibitors enhanced sucrose synthase activity and promoted grain filling of basal rice kernels. Functional Plant Biology 27, 997–1008.
Ethylene inhibitors enhanced sucrose synthase activity and promoted grain filling of basal rice kernels.Crossref | GoogleScholarGoogle Scholar |

Nitsch JP (1950) Growth and morphogenesis of the strawberry as related to auxin. American Journal of Botany 37, 211–215.
Growth and morphogenesis of the strawberry as related to auxin.Crossref | GoogleScholarGoogle Scholar |

Nordström A, Tarkowski P, Tarkowska D, Norbaek R, Åstot C, Dolezal K, Sandberg G (2004) Auxin regulation of cytokinin biosynthesis in Arabidopsis thaliana: a factor of potential importance for auxin–cytokinin-regulated development. Proceedings of the National Academy of Sciences of the United States of America 101, 8039–8044.
Auxin regulation of cytokinin biosynthesis in Arabidopsis thaliana: a factor of potential importance for auxin–cytokinin-regulated development.Crossref | GoogleScholarGoogle Scholar | 15146070PubMed |

Panda BB, Badoghar AK, Sekhar S, Shaw BP, Mohapatra PK (2016) 1-MCP treatment enhanced expression of genes controlling endosperm cell division and starch biosynthesis for improvement of grain filling in a dense-panicle rice cultivar. Plant Science 246, 11–25.
1-MCP treatment enhanced expression of genes controlling endosperm cell division and starch biosynthesis for improvement of grain filling in a dense-panicle rice cultivar.Crossref | GoogleScholarGoogle Scholar | 26993232PubMed |

Panda BB, Sekhar S, Dash SK, Behera L, Shaw BP (2018) Biochemical and molecular characterisation of exogenous cytokinin application on grain filling in rice. BMC Plant Biology 18, 89
Biochemical and molecular characterisation of exogenous cytokinin application on grain filling in rice.Crossref | GoogleScholarGoogle Scholar | 29783938PubMed |

Peng T, Sun H, Qiao M, Zhao Y, Du Y, Zhang J, Li J, Tang G, Zhao Q (2014) Differentially expressed microRNA cohorts in seed development may contribute to poor grain filling of inferior spikelets in rice. BMC Plant Biology 14, 196
Differentially expressed microRNA cohorts in seed development may contribute to poor grain filling of inferior spikelets in rice.Crossref | GoogleScholarGoogle Scholar | 25052585PubMed |

Rijavec T, Kovač M, Kladnik A, Chourey PS, Dermastia M (2009) A comparative study on the role of cytokinins in caryopsis development in the maize miniature1 seed mutant and its wild type. Journal of Integrative Plant Biology 51, 840–849.
A comparative study on the role of cytokinins in caryopsis development in the maize miniature1 seed mutant and its wild type.Crossref | GoogleScholarGoogle Scholar | 19723243PubMed |

Russell French S, Abu-Zaitoon Y, Uddin MM, Bennett K, Nonhebel HM (2014) Auxin and cell wall invertase related signalling during rice grain development. Plants 3, 95–112.
Auxin and cell wall invertase related signalling during rice grain development.Crossref | GoogleScholarGoogle Scholar |

Sabelli PA, Larkins BA (2009) The development of endosperm in grasses. Plant Physiology 149, 14–26.
The development of endosperm in grasses.Crossref | GoogleScholarGoogle Scholar | 19126691PubMed |

Sakamoto T, Morinaka Y, Ishiyama K, Kobayashi M, Itoh H, Kayano T, Iwahori S, Matsuoka M, Tanaka H (2003) Genetic manipulation of gibberellin metabolism in transgenic rice. Nature Biotechnology 21, 909–913.
Genetic manipulation of gibberellin metabolism in transgenic rice.Crossref | GoogleScholarGoogle Scholar | 12858182PubMed |

Seiler C, Harshavardhan VT, Rajesh K, Reddy PS, Strickert M, Rolletschek H, Scholz U, Wobus U, Sreenivasulu N (2011) ABA biosynthesis and degradation contributing to ABA homeostasis during barley seed development under control and terminal drought-stress conditions. Journal of Experimental Botany 62, 2615–2632.
ABA biosynthesis and degradation contributing to ABA homeostasis during barley seed development under control and terminal drought-stress conditions.Crossref | GoogleScholarGoogle Scholar | 21289079PubMed |

Sekhar S, Panda BB, Mohapatra T, Das K, Shaw BP, Kariali E, Mohapatra PK (2015) Spikelet-specific variation in ethylene production and constitutive expression of ethylene receptors and signal transducers during grain filling of compact-and lax-panicle rice (Oryza sativa) cultivars. Journal of Plant Physiology 179, 21–34.
Spikelet-specific variation in ethylene production and constitutive expression of ethylene receptors and signal transducers during grain filling of compact-and lax-panicle rice (Oryza sativa) cultivars.Crossref | GoogleScholarGoogle Scholar | 25817414PubMed |

Shang XL, Xie RR, Tian H, Wang QL, Guo FQ (2016) Putative zeatin O‐glucosyltransferase OscZOG1 regulates root and shoot development and formation of agronomic traits in rice. Journal of Integrative Plant Biology 58, 627–641.
Putative zeatin O‐glucosyltransferase OscZOG1 regulates root and shoot development and formation of agronomic traits in rice.Crossref | GoogleScholarGoogle Scholar | 26507364PubMed |

Shen C, Wang S, Bai Y, Wu Y, Zhang S, Chen M, Guilfoyle TJ, Wu P, Qi Y (2010) Functional analysis of the structural domain of ARF proteins in rice (Oryza sativa L.). Journal of Experimental Botany 61, 3971–3981.
Functional analysis of the structural domain of ARF proteins in rice (Oryza sativa L.).Crossref | GoogleScholarGoogle Scholar | 20693412PubMed |

Šimášková M, O’Brien JA, Khan M, Van Noorden G, Ötvös K, Vieten A, De Clercq I, Van Haperen JMA, Cuesta C, Hoyerová K, Vanneste S, Marhavý P, Wabnik K, Van Breusegem F, Nowack M, Murphy A, Friml J, Weijers D, Beeckman T, Benková E (2015) Cytokinin response factors regulate PIN-FORMED auxin transporters. Nature Communications 6, 8717
Cytokinin response factors regulate PIN-FORMED auxin transporters.Crossref | GoogleScholarGoogle Scholar | 26541513PubMed |

Singh DP, Jermakow AM, Swain SM (2002) Gibberellins are required for seed development and pollen tube growth in Arabidopsis. The Plant Cell 14, 3133–3147.
Gibberellins are required for seed development and pollen tube growth in Arabidopsis.Crossref | GoogleScholarGoogle Scholar | 12468732PubMed |

Song Y, Wang L, Xiong L (2009) Comprehensive expression profiling analysis of OsIAA gene family in developmental processes and in response to phytohormone and stress treatments. Planta 229, 577–591.
Comprehensive expression profiling analysis of OsIAA gene family in developmental processes and in response to phytohormone and stress treatments.Crossref | GoogleScholarGoogle Scholar | 19034497PubMed |

Song J, Jiang L, Jameson PE (2012) Co-ordinate regulation of cytokinin gene family members during flag leaf and reproductive development in wheat. BMC Plant Biology 12, 78
Co-ordinate regulation of cytokinin gene family members during flag leaf and reproductive development in wheat.Crossref | GoogleScholarGoogle Scholar | 22672647PubMed |

Sreenivasulu N, Wobus U (2013) Seed-development programs: a systems biology-based comparison between dicots and monocots. Annual Review of Plant Biology 64, 189–217.
Seed-development programs: a systems biology-based comparison between dicots and monocots.Crossref | GoogleScholarGoogle Scholar | 23451786PubMed |

Sreenivasulu N, Altschmied L, Radchuk V, Gubatz S, Wobus U, Weschke W (2004) Transcript profiles and deduced changes of metabolic pathways in maternal and filial tissues of developing barley grains. The Plant Journal 37, 539–553.
Transcript profiles and deduced changes of metabolic pathways in maternal and filial tissues of developing barley grains.Crossref | GoogleScholarGoogle Scholar | 14756762PubMed |

Sreenivasulu N, Borisjuk L, Junker BH, Mock H-P, Rolletschek H, Seiffert U, Weschke W, Wobus U (2010) Barley grain development: toward an integrative view. International Review of Cell and Molecular Biology 281, 49–89.
Barley grain development: toward an integrative view.Crossref | GoogleScholarGoogle Scholar | 20460183PubMed |

Sreenivasulu N, Butardo Jr VM, Misra G, Cuevas RP, Anacleto R, Kavi Kishor PB (2015) Designing climate-resilient rice with ideal grain quality suited for high-temperature stress. Journal of Experimental Botany 66, 1737–1748.
Designing climate-resilient rice with ideal grain quality suited for high-temperature stress.Crossref | GoogleScholarGoogle Scholar | 25662847PubMed |

Swain SM, Ross JJ, Reid JB, Kamiya Y (1995) Gibberellins and pea seed development. Planta 195, 426–433.
Gibberellins and pea seed development.Crossref | GoogleScholarGoogle Scholar |

Takatsuka H, Umeda M (2014) Hormonal control of cell division and elongation along differentiation trajectories in roots. Journal of Experimental Botany 65, 2633–2643.
Hormonal control of cell division and elongation along differentiation trajectories in roots.Crossref | GoogleScholarGoogle Scholar | 24474807PubMed |

Tamaki H, Reguera M, Abdel-Tawab YM, Takebayashi Y, Kasahara H, Blumwald E (2015) Targeting hormone-related pathways to improve grain yield in rice: a chemical approach. PLoS One 10, e0131213
Targeting hormone-related pathways to improve grain yield in rice: a chemical approach.Crossref | GoogleScholarGoogle Scholar | 26133989PubMed |

Tan BC, Joseph LM, Deng WT, Liu L, Li QB, Cline K, McCarty DR (2003) Molecular characterization of the Arabidopsis 9‐cis epoxycarotenoid dioxygenase gene family. The Plant Journal 35, 44–56.
Molecular characterization of the Arabidopsis 9‐cis epoxycarotenoid dioxygenase gene family.Crossref | GoogleScholarGoogle Scholar | 12834401PubMed |

Tang T, Xie H, Wang Y, Lu B, Liang J (2009) The effect of sucrose and abscisic acid interaction on sucrose synthase and its relationship to grain filling of rice (Oryza sativa L.). Journal of Experimental Botany 60, 2641–2652.
The effect of sucrose and abscisic acid interaction on sucrose synthase and its relationship to grain filling of rice (Oryza sativa L.).Crossref | GoogleScholarGoogle Scholar | 19401410PubMed |

Thiel J (2014) Development of endosperm transfer cells in barley. Frontiers of Plant Science 5, 108
Development of endosperm transfer cells in barley.Crossref | GoogleScholarGoogle Scholar |

Thiel J, Hollmann J, Rutten T, Weber H, Scholz U, Weschke W (2012) 454 Transcriptome sequencing suggests a role for two-component signalling in cellularization and differentiation of barley endosperm transfer cells. PLoS One 7, e41867
454 Transcriptome sequencing suggests a role for two-component signalling in cellularization and differentiation of barley endosperm transfer cells.Crossref | GoogleScholarGoogle Scholar | 22848641PubMed |

Uchiumi T, Okamoto T (2010) Rice fruit development is associated with an increased IAA content in pollinated ovaries. Planta 232, 579–592.
Rice fruit development is associated with an increased IAA content in pollinated ovaries.Crossref | GoogleScholarGoogle Scholar | 20512651PubMed |

Wang E, Wang J, Zhu X, Hao W, Wang L, Li Q, Zhang L, He W, Lu B, Lin H, Ma H, Zhang G, He Z (2008) Control of rice grain-filling and yield by a gene with a potential signature of domestication. Nature Genetics 40, 1370–1374.
Control of rice grain-filling and yield by a gene with a potential signature of domestication.Crossref | GoogleScholarGoogle Scholar | 18820698PubMed |

Wang Z, Xu Y, Chen T, Zhang H, Yang J, Zhang J (2015) Abscisic acid and the key enzymes and genes in sucrose-to-starch conversion in rice spikelets in response to soil drying during grain filling. Planta 241, 1091–1107.
Abscisic acid and the key enzymes and genes in sucrose-to-starch conversion in rice spikelets in response to soil drying during grain filling.Crossref | GoogleScholarGoogle Scholar | 25589060PubMed |

Wang Y, Zhang T, Wang R, Zhao Y (2018) Recent advances in auxin research in rice and their implications for crop improvement. Journal of Experimental Botany 69, 255–263.
Recent advances in auxin research in rice and their implications for crop improvement.Crossref | GoogleScholarGoogle Scholar | 28992208PubMed |

Waters AJ, Bilinski P, Eichten SR, Vaughn MW, Ross-Ibarra J, Gehring M, Springer NM (2013) Comprehensive analysis of imprinted genes in maize reveals allelic variation for imprinting and limited conservation with other species. Proceedings of the National Academy of Sciences of the United States of America 110, 19639–19644.
Comprehensive analysis of imprinted genes in maize reveals allelic variation for imprinting and limited conservation with other species.Crossref | GoogleScholarGoogle Scholar | 24218619PubMed |

Weier D, Thiel J, Kohl S, Tarkowská D, Strnad M, Schaarschmidt S, Weschke W, Weber H, Hause B (2014) Gibberellin-to-abscisic acid balances govern development and differentiation of the nucellar projection of barley grains. Journal of Experimental Botany 65, 5291–5304.
Gibberellin-to-abscisic acid balances govern development and differentiation of the nucellar projection of barley grains.Crossref | GoogleScholarGoogle Scholar | 25024168PubMed |

Weng J, Li B, Liu C, Yang X, Wang H, Hao Z, Li M, Zhang D, Ci X, Li X, Zhang S (2013) A non-synonymous SNP within the isopentenyl transferase 2 locus is associated with kernel weight in Chinese maize inbreds (Zea mays L.). BMC Plant Biology 13, 98
A non-synonymous SNP within the isopentenyl transferase 2 locus is associated with kernel weight in Chinese maize inbreds (Zea mays L.).Crossref | GoogleScholarGoogle Scholar | 23826856PubMed |

Weston DE, Reid JB, Ross JJ (2009) Auxin regulation of gibberellin biosynthesis in the roots of pea (Pisum sativum). Functional Plant Biology 36, 362–369.
Auxin regulation of gibberellin biosynthesis in the roots of pea (Pisum sativum).Crossref | GoogleScholarGoogle Scholar |

Wu X, Liu J, Li D, Liu CM (2016) Rice caryopsis development II: Dynamic changes in the endosperm. Journal of Integrative Plant Biology 58, 786–798.
Rice caryopsis development II: Dynamic changes in the endosperm.Crossref | GoogleScholarGoogle Scholar | 27449987PubMed |

Wuriyanghan H, Zhang B, Cao WH, Ma B, Lei G, Liu YF, Wei W, Wu HJ, Chen LJ, Chen HW, Cao YR, He SJ, Zhang WK, Wang XJ, Chen SY, Zhang JS (2009) The ethylene receptor ETR2 delays floral transition and affects starch accumulation in rice. The Plant Cell 21, 1473–1494.
The ethylene receptor ETR2 delays floral transition and affects starch accumulation in rice.Crossref | GoogleScholarGoogle Scholar | 19417056PubMed |

Xiao Y, Liu D, Zhang G, Gao S, Liu L, Xu F, Che R, Wang Y, Tong H, Chu C (2018) Big Grain3, encoding a purine permease, regulates grain size via modulating cytokinin transport in rice. Journal of Integrative Plant Biology
Big Grain3, encoding a purine permease, regulates grain size via modulating cytokinin transport in rice.Crossref | GoogleScholarGoogle Scholar | 30267474PubMed |

Xie Z, Zhang ZL, Zou X, Yang G, Komatsu S, Shen QJ (2006) Interactions of two abscisic-acid induced WRKY genes in repressing gibberellin signalling in aleurone cells. The Plant Journal 46, 231–242.
Interactions of two abscisic-acid induced WRKY genes in repressing gibberellin signalling in aleurone cells.Crossref | GoogleScholarGoogle Scholar | 16623886PubMed |

Xu SB, Li T, Deng ZY, Chong K, Xue Y, Wang T (2008) Dynamic proteomic analysis reveals a switch between central carbon metabolism and alcoholic fermentation in rice filling grains. Plant Physiology 148, 908–925.
Dynamic proteomic analysis reveals a switch between central carbon metabolism and alcoholic fermentation in rice filling grains.Crossref | GoogleScholarGoogle Scholar | 18753281PubMed |

Yamamoto MP, Onodera Y, Touno SM, Takaiwa F (2006) Synergism between RPBF Dof and RISBZ1 bZIP activators in the regulation of rice seed expression genes. Plant Physiology 141, 1694–1707.
Synergism between RPBF Dof and RISBZ1 bZIP activators in the regulation of rice seed expression genes.Crossref | GoogleScholarGoogle Scholar | 16798940PubMed |

Yang J, Zhang J (2010) Grain-filling problem in ‘super’ rice. Journal of Experimental Botany 61, 1–5.
Grain-filling problem in ‘super’ rice.Crossref | GoogleScholarGoogle Scholar | 19959608PubMed |

Yang J, Zhang J, Liu K, Wang Z, Liu L (2006a) Abscisic acid and ethylene interact in wheat grains in response to soil drying during grain filling. New Phytologist 171, 293–303.
Abscisic acid and ethylene interact in wheat grains in response to soil drying during grain filling.Crossref | GoogleScholarGoogle Scholar | 16866937PubMed |

Yang J, Zhang J, Wang Z, Liu K, Wang P (2006b) Post-anthesis development of inferior and superior spikelets in rice in relation to abscisic acid and ethylene. Journal of Experimental Botany 57, 149–160.
Post-anthesis development of inferior and superior spikelets in rice in relation to abscisic acid and ethylene.Crossref | GoogleScholarGoogle Scholar | 16330527PubMed |

Yang JH, Han SJ, Yoon EK, Lee WS (2006c) Evidence of an auxin signal pathway, microRNA167-ARF8-GH3, and its response to exogenous auxin in cultured rice cells. Nucleic Acids Research 34, 1892–1899.
Evidence of an auxin signal pathway, microRNA167-ARF8-GH3, and its response to exogenous auxin in cultured rice cells.Crossref | GoogleScholarGoogle Scholar | 16598073PubMed |

Yang D, Li Y, Shi Y, Cui Z, Luo Y, Zheng M, Chen J, Li Y, Yin Y, Wang Z (2016) Exogenous cytokinins increase grain yield of winter wheat cultivars by improving stay-green characteristics under heat stress. PLoS One 11, e0155437
Exogenous cytokinins increase grain yield of winter wheat cultivars by improving stay-green characteristics under heat stress.Crossref | GoogleScholarGoogle Scholar | 27907165PubMed |

Yeh SY, Chen HW, Ng CY, Lin CY, Tseng TH, Li WH, Ku MS (2015) Down-regulation of cytokinin oxidase 2 expression increases tiller number and improves rice yield. Rice 8, 36
Down-regulation of cytokinin oxidase 2 expression increases tiller number and improves rice yield.Crossref | GoogleScholarGoogle Scholar | 26643073PubMed |

Yin LL, Xue HW (2012) The MADS29 transcription factor regulates the degradation of the nucellus and the nucellar projection during rice seed development. The Plant Cell 24, 1049–1065.
The MADS29 transcription factor regulates the degradation of the nucellus and the nucellar projection during rice seed development.Crossref | GoogleScholarGoogle Scholar | 22408076PubMed |

Yoshikawa T, Ito M, Sumikura T, Nakayama A, Nishimura T, Kitano H, Yamaguchi I, Koshiba T, Hibara KI, Nagato Y, Itoh JI (2014) The rice FISH BONE gene encodes a tryptophan aminotransferase, which affects pleiotropic auxin-related processes. The Plant Journal 78, 927–936.
The rice FISH BONE gene encodes a tryptophan aminotransferase, which affects pleiotropic auxin-related processes.Crossref | GoogleScholarGoogle Scholar | 24654985PubMed |

You C, Zhu H, Xu B, Huang W, Wang S, Ding Y, Liu Z, Li G, Chen L, Ding C, Tang S (2016) Effect of removing superior spikelets on grain filling of inferior spikelets in rice. Frontiers of Plant Science 7, 1161
Effect of removing superior spikelets on grain filling of inferior spikelets in rice.Crossref | GoogleScholarGoogle Scholar |

Zhang ZL, Xie Z, Zou X, Casaretto J, Ho THD, Shen QJ (2004) A rice WRKY gene encodes a transcriptional repressor of the gibberellin signalling pathway in aleurone cells. Plant Physiology 134, 1500–1513.
A rice WRKY gene encodes a transcriptional repressor of the gibberellin signalling pathway in aleurone cells.Crossref | GoogleScholarGoogle Scholar | 15047897PubMed |

Zhang H, Tan G, Yang L, Yang J, Zhang J, Zhao B (2009) Hormones in the grains and roots in relation to post-anthesis development of inferior and superior spikelets in japonica/indica hybrid rice. Plant Physiology and Biochemistry 47, 195–204.
Hormones in the grains and roots in relation to post-anthesis development of inferior and superior spikelets in japonica/indica hybrid rice.Crossref | GoogleScholarGoogle Scholar | 19117763PubMed |

Zhang L, Li XH, Gao Z, Shen S, Liang XG, Zhao X, Lin S, Zhou SL (2017) Regulation of maize kernel weight and carbohydrate metabolism by abscisic acid applied at the early and middle post-pollination stages in vitro. Journal of Plant Physiology 216, 1–10.
Regulation of maize kernel weight and carbohydrate metabolism by abscisic acid applied at the early and middle post-pollination stages in vitro.Crossref | GoogleScholarGoogle Scholar | 28544894PubMed |

Zhao Y (2008) The role of local biosynthesis of auxin and cytokinin in plant development. Current Opinion in Plant Biology 11, 16–22.
The role of local biosynthesis of auxin and cytokinin in plant development.Crossref | GoogleScholarGoogle Scholar | 18409210PubMed |

Zhao Z, Zhang Y, Liu X, Zhang X, Liu S, Yu X, Ren Y, Zheng X, Zhou K, Jiang L, Guo X, Gai Y, Wu C, Zhai H, Wang H, Wan J (2013) A role for a dioxygenase in auxin metabolism and reproductive development in rice. Developmental Cell 27, 113–122.
A role for a dioxygenase in auxin metabolism and reproductive development in rice.Crossref | GoogleScholarGoogle Scholar | 24094741PubMed |

Zhou Y, Andriunas F, Offler CE, McCurdy DW, Patrick JW (2010) An epidermal‐specific ethylene signal cascade regulates trans‐differentiation of transfer cells in Vicia faba cotyledons. New Phytologist 185, 931–943.
An epidermal‐specific ethylene signal cascade regulates trans‐differentiation of transfer cells in Vicia faba cotyledons.Crossref | GoogleScholarGoogle Scholar | 20085619PubMed |

Zürcher E, Liu J, di Donato M, Geisler M, Müller B (2016) Plant development regulated by cytokinin sinks. Science 353, 1027–1030.
Plant development regulated by cytokinin sinks.Crossref | GoogleScholarGoogle Scholar | 27701112PubMed |