Abstract
Cicer anatolicum, a perennial species, has ascochyta blight resistance superior to that found in the cultivated chickpea. However, hybridization barriers during early stages of embryo development curtail access to this trait. Since hormones play an essential role in early embryo development, we have determined the hormone profiles of 4-, 8-, and 12-day old seeds from a Canadian chickpea (Cicer arietinum L.) cv. CDC Xena, from Indian cvs. Swetha and Bharati, and from a perennial accession of C. anatolicum (PI 383626). Indole-3-acetic acid content peaked on day 4 in CDC Xena, on day 8 in both Indian cultivars but only on day 12 in C. anatolicum. The cytokinins, isopentenyladenosine (iPA) and trans zeatin riboside (tZR) were predominant in CDC Xena and Swetha seeds on day 4, whereas cis zeatin riboside was the major component in Bharati. In C. anatolicum, iPA maxed out on day 4 and tZR on day 12. The bioactive gibberellin GA1 spiked on day 4 in CDC Xena and Bharati, on day 8 in Swetha but only on day 12 in C. anatolicum. Eight-day old seeds had the highest abscisic acid content in the cultivars but spiked on day 12 in the perennial species. The hormone profiles of the perennial species showed delayed spikes in all four hormone groups indicating that there is a mismatch in the hormone requirements of the different embryos. Improving synchronization of early seed hormone profiles of cultivated and perennial chickpea should improve interspecific hybrid production.




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Abbreviations
- ABA:
-
Abscisic acid
- ABA-GE:
-
ABA-glucose ester
- 7′OH-ABA:
-
7′-Hydroxy-ABA
- DAA:
-
Days after anthesis
- DPA:
-
Dihydrophaseic acid
- GA1–53 :
-
Gibberellins 1–53
- IAA:
-
Indole-3-acetic acid
- IAA-Ala:
-
N-(indole-3-yl-acetyl)-alanine
- IAA-Asp:
-
N-(indole-3-yl-acetyl)-aspartic acid
- IAA-Glu:
-
N-(indole-3-yl-acetyl)-glutamic acid
- IAA-Leu:
-
N-(indole-3-yl-acetyl)-leucine
- 2iP:
-
Isopentenyladenine
- iPA:
-
Isopentenyladenosine
- PA:
-
Phaseic acid
- Z:
-
Zeatin
- ZOG:
-
Zeatin-O-glucoside
- dhZ:
-
Dihydro-zeatin
- ZR:
-
Zeatin riboside
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Acknowledgments
Financial support for this project was provided by the Saskatchewan Pulse Growers Association. Many thanks to C. Coyne and F. Muehlbauer from USDA (USA) for providing the wild Cicer seeds and to N. Mallikarjuna and P. Gaur from ICRISAT (India) for providing the seeds from the Indian cultivars. We also wish to thank T. Ament, J. Chow, R. Grewal, S. B. Mudiyanselage, S. Tschirren and J. Walsh for their endless hours of dissection. We also thank V. Cekic and M. Lafond (NRCC SK) for hormone profiling sample preparation.
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Lulsdorf, M.M., Yuan, H.Y., Slater, S.M.H. et al. Endogenous hormone profiles during early seed development of C. arietinum and C. anatolicum . Plant Growth Regul 71, 191–198 (2013). https://doi.org/10.1007/s10725-013-9819-2
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DOI: https://doi.org/10.1007/s10725-013-9819-2