PEP1は,アラビス・アルピーナ (Arabis alpina) の多年生開花を調節する
Renhou Wang1, Sara Farrona, Coral Vincent
1Max Planck Institute for Plant Breeding Research, Carl von Linne Weg 10, D-50829 Cologne, Germany.
Nature
|April 17, 2009
まとめ
アラビス・アルピーナ (Arabis alpina) のような多年生植物は,永久開花1 (pep1) 遺伝子により季節的に開花する. この遺伝子は,この遺伝子を
科学分野:
- 植物生物学 植物生物学
- 分子遺伝学 分子遺伝学
- 進化的な植物学
背景:
- 一年生植物は1年でライフサイクルを完了するが,多年生植物は長生きし,繰り返し花を咲かせる.
- 季節的な開花を含む多年生植物のライフサイクルを駆動するメカニズムは,一年生植物のメカニズムよりも理解されている.
- アラビドプシス・サリアナ (Arabidopsis thaliana) は1年生で,その親類であるアラビス・アルピーナ (Arabis alpina) は多年生である.
研究 の 目的:
- アラビス・アルピーナ (Arabis alpina) の多年生花の遺伝的基礎を調査する.
- 多年生植物が,季節と同期した繰り返し開花サイクルをどのように調節するかを理解する.
- 多年生と一年生種の花期調節メカニズムを比較する.
主な方法:
- アラビス・アルピーナの永久開花1 (pep1) 変異体の識別と特徴付け.
- アラビス・アルピーナ (Arabis alpina) のPEP1と,アラビドプシス・サリアナ (Arabidopsis thaliana) のFLC (FLOWERING LOCUS C) の比較分析
- 遺伝子発現パターンとクロマチンの改変の検査.
主要な成果:
- pep1変異体は,開花期間や枝分かれなど,多年生植物の特徴が変化している.
- PEP1はアラビドプシスFLCの正体であり,季節的な開花反応を調節する.
- PEP1は寒さによる一時的な抑制を示し,FLCの安定した抑制とは異なり,周期的な開花を可能にします.
- 異なるクロマチンの改変パターンは,PEP1とFLCの異なる発現と相関しています.
結論:
- PEP1は,季節的な開花を含む,多年生植物生命史の特徴の重要な調節因子です.
- PEP1とFLCの染色体調節の違いは,多年生と一年生種の間での開花制御の違いを説明する.
- この研究は,多年生植物の生命周期の進化の基礎となる重要なメカニズムを明らかにしています.
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