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Int. J. Mol. Sci. 2016, 17(9), 1472; doi:10.3390/ijms17091472

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

1
The Samuel Roberts Noble Foundation, Plant Biology Division, 2510 Sam Noble Parkway, Ardmore, OK 73401, USA
2
Kafkas University–Faculty of Engineering and Architecture, Central Campus, Kars 36100, Turkey
3
Shanghai Center for Plant Stress Biology, Shanghai Institutes of Biological Sciences, Chinese Academy of Sciences, 3888 Chenhua Road, Shanghai 201602, China
*
Author to whom correspondence should be addressed.
Academic Editor: Marcello Iriti
Received: 14 July 2016 / Revised: 21 August 2016 / Accepted: 23 August 2016 / Published: 8 September 2016
(This article belongs to the Special Issue Pulses)
View Full-Text   |   Download PDF [3016 KB, uploaded 8 September 2016]   |  

Abstract

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. View Full-Text
Keywords: legume grains; abscisic acid; auxin; cell division; embryogenesis; Medicago truncatula; seed size legume grains; abscisic acid; auxin; cell division; embryogenesis; Medicago truncatula; seed size
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Bandyopadhyay, K.; Uluçay, O.; Şakiroğlu, M.; Udvardi, M.K.; Verdier, J. Analysis of Large Seeds from Three Different Medicago truncatula Ecotypes Reveals a Potential Role of Hormonal Balance in Final Size Determination of Legume Grains. Int. J. Mol. Sci. 2016, 17, 1472.

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