Analysis of Large Seeds from Three Different Medicago truncatula Ecotypes Reveals a Potential Role of Hormonal Balance in Final Size Determination of Legume Grains

Autor: Orhan Uluçay, Kaustav Bandyopadhyay, Jerome Verdier, Michael K. Udvardi, Muhammet Sakiroglu
Přispěvatelé: Plant Biology Division, The Samuel Roberts Noble Foundation, Faculty of Engineering and Architecture, Central Campus, Kafkas University, Shanghai Institutes of Biological Sciences,Shanghai Center for Plant Stress Biology, Chinese Academy of Agricultural Sciences (CAAS), Verdier, Jérôme
Jazyk: angličtina
Rok vydání: 2016
Předmět:
Zdroj: International Journal of Molecular Sciences
International Journal of Molecular Sciences, MDPI, 2016, 17 (9), pp.1472. ⟨10.3390/ijms17091472⟩
International Journal of Molecular Sciences; Volume 17; Issue 9; Pages: 1472
International Journal of Molecular Sciences, Vol 17, Iss 9, p 1472 (2016)
International Journal of Molecular Sciences 9 (17), 1472. (2016)
ISSN: 1661-6596
1422-0067
DOI: 10.3390/ijms17091472⟩
Popis: Legume seeds are important as protein and oil source for human diet. Understanding how their final seed size is determined is crucial to improve crop yield. In this study, we analyzed seed development of three accessions of the model legume, Medicago truncatula, displaying contrasted seed size. By comparing two large seed accessions to the reference accession A17, we described mechanisms associated with large seed size determination and potential factors modulating the final seed size. We observed that early events during embryogenesis had a major impact on final seed size and a delayed heart stage embryo development resulted to large seeds. We also observed that the difference in seed growth rate was mainly due to a difference in embryo cell number, implicating a role of cell division rate. Large seed accessions could be explained by an extended period of cell division due to a longer embryogenesis phase. According to our observations and recent reports, we observed that auxin (IAA) and abscisic acid (ABA) ratio could be a key determinant of cell division regulation at the end of embryogenesis. Overall, our study highlights that timing of events occurring during early seed development play decisive role for final seed size determination.
Databáze: OpenAIRE