COOLAIR発現のフィードバック制御は,種子の休眠期と開花期を制御する
1Department of Crop Genetics, John Innes Centre, Norwich Research Park, Norwich NR4 7UH, UK.
まとめ
植物はFLOWERING LOCUS C (FLC) とFLOWERING LOCUS T (FT) のタンパク質を使用して,種子の休眠期と開花時間を制御します. これらの遺伝子はアラビドプシスの 季節的な発達変異を制御するために 反対の方法で機能します
科学分野:
- 植物生物学
- 分子遺伝学
- 発達生物学
背景:
- 植物は気温や昼間の長さといった 季節的適応のシグナルを利用します
- フラワーロカスC (FLC) とフラワーロカスT (FT) は,植物の発達を調節する重要なタンパク質です.
- これらのタンパク質は,開花時間と種子の休眠期に影響することが知られている.
研究 の 目的:
- 温度に応じて子孫の種子の休眠状態を調節するFLCとFTの役割を調査する.
- FLCとFTが種子の休眠状態を調節する分子メカニズムを解明する.
- 種子の休眠期と開花期におけるFLCとFTの制御機能を比較する.
主な方法:
- FLCとFTの遺伝子発現パターンの分析
- クロマチン状態の変化の調査
- アラビドプシスをモデル生物として利用する.
主要な成果:
- FLCとFTは,種子休眠期と開花期に比べ,対極的な規制役割を示しています.
- FTは,FLC遺伝子発現を調節することによって,種子の休眠状態に影響を与えます.
- FTは反意味のFLC転写を活性化し,クロマチンの状態を変化させます.
結論:
- 同じ遺伝子であるFLCとFTは アラビドプシスの開花時間と種子休眠期の両方を制御する.
- これらの遺伝子はそれぞれのプロセスに対して 逆の構成で動作し 季節的な温度変化に適応できます
- これは植物における季節的な 発達的な可塑性の 洗練された遺伝的メカニズムを示しています
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