69.高休眠性シロイヌナズナ・アクセッションにおける胚休眠性調節機構の解析(口頭発表)

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Seed dormancy, defined as the failure of intact seed to germinate in the presence of water and light, is thought to be an important adaptive trait that determines geographical distribution of many plant species. In Arabidopsis and many crop species, seed dormancy is imposed during seed maturation and released by various environmental factors, such as after-ripening (dry storage of matured seed), cold stratification, and nitrate treatment. It is thought that these signals control seed dormancy and germination by regulating sensitivity and metabolism of phytohormones, such as abscisic acid and gibberellins. In this study, we assessed the effect of various environmental factors on seed dormancy, especially embryo dormancy, using hyper-dormant accessions of Arabidopsis. Interestingly, it was found that strong embryonic seed dormancy, which can be released by application of a specific bioactive compound, is imposed under certain conditions. In the next meeting, we will discuss about the role of phytohormone metabolisms in the embryo dormancy induction in these dormant accessions.
2009-10-06