セミナー情報

セミナー情報

Seasonal Flowering in Annual and Perennial Plants

演題 Seasonal Flowering in Annual and Perennial Plants
講演者 Prof. George Coupland (Max Planck Institute for Plant Breeding Research)
使用言語 English
日時 平成22年11月19日(金曜日) 13:00~
場所 バイオサイエンス研究科 大セミナー室
内容

We are comparing the biochemical mechanisms by which plants synchronise their life cycles to the changing seasons. Arabidopsis thaliana is a model annual plant, which flowers only once in a life cycle that typically lasts for a few months. We have studied the regulation of transcription factors that promote flowering specifically in response to the long day lengths of summer. We have shown that this response depends on two layers of regulation involving circadian-clock control of transcription and protein degradation that is controlled by light. As a perennial species, we have used Arabis alpina, which is a close relative of A. thaliana. This species lives for many years, flowers each year and absolutely requires exposure to winter temperatures for flowering. We have shown how specific transcription factors involved in temperature response are differently regulated between these annual and perennial species, and that this enables the perennial species to flower each year. Evolution of the regulation of these genes involves changes in chromatin regulation. We are exploring natural variation in this process in Arabis alpina and how vernalization response intersects with the age of the shoot to influence flowering time. I will discuss the mechanisms that confer these seasonal patterns of flowering and how they have evolved.

問合せ先 植物分子遺伝学
島本 功 (simamoto@bs.naist.jp)

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