Abstract
An endosperm culture of Haskap (Lonicera caerulea var. emphyllocalyx) was established to develop polyploid plants and investigate the regeneration ability of the endosperm. Based on histological analysis of embryo and endosperm development, endosperms at the globular to early torpedo-stages of developing embryos were used to initiate an endosperm culture. Formation of shoot primordia was observed on Murashige and Skoog (MS) medium (Physiol Plant 15:473–497, 1962) containing benzyladenine and indole-3-butyric acid. Shoot primordium formation was confirmed in some genotypes with regeneration frequencies ranging between 1.9 and 10.0%. These proliferated on ½ MS medium containing 2.89 μM gibberellic acid (GA3), and then elongated and rooted on MS medium containing 0.44 μM BA and 2.89 μM GA3. These shoots developed into plantlets on ½ MS medium. Plantlets maintained ploidy of the endosperm following flow cytometric analysis, thus confirming that these were derived from the endosperm. These results indicated that endosperms were capable of regeneration.
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Abbreviations
- BA:
-
6-Benzyladenine
- CH:
-
Casein hydrolysate
- DAP:
-
Days after pollination
- DAPI:
-
4′,6-Diamidino-2-phenylindole
- GA3 :
-
Gibberellic acid
- IBA:
-
Indole-3-butyric acid
- MS:
-
Murashige and Skoog (1962) medium
- NAA:
-
1-Naphthaleneacetic acid
- PGR:
-
Plant growth regulator
- TDZ:
-
Thidiazuron
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Acknowledgments
Authors thank Dr. K. Sahara for valuable suggestions on chromosome observation. We are grateful to Professor H. Nakashima for the supports of plant managements. We also gratefully acknowledge H. Hori, H. Tamura, M. Ikuta, H. Nakano and S. Takamushi for the technical assistances on the University farms. This work was supported in part by grants from Inamori Foundation, Takeda Scientific foundation, and a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports Science and Technology, Japan.
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Miyashita, T., Ohashi, T., Shibata, F. et al. Plant regeneration with maintenance of the endosperm ploidy level by endosperm culture in Lonicera caerulea var. emphyllocalyx . Plant Cell Tiss Organ Cult 98, 291–301 (2009). https://doi.org/10.1007/s11240-009-9562-6
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DOI: https://doi.org/10.1007/s11240-009-9562-6