サーカディアンクロックの自然発生の変動によって与えられるフィットネスの向上
Todd P Michael1, Patrice A Salomé, Hannah J Yu
1Dartmouth College, Department of Biological Sciences, Hanover, NH 03755, USA.
Science (New York, N.Y.)
|November 8, 2003
まとめ
植物の生理時時計のタイミングの自然な変動は,適応に不可欠です. 研究者らは,アラビドプシス植物間の期間,相,振幅の違いが,その起源と相関していることを発見しました.
科学分野:
- 植物生物学 植物生物学
- 遺伝学 遺伝学とは
- クロノバイオロジー クロノバイオロジー
背景:
- 日常時計は,生物の毎日のリズムを調節する.
- これらのリズムにおける自然な変動は,多様な環境への適応に不可欠である.
- アラビドプシス・タリアナは,昼間の時計のメカニズムを研究するためのモデル生物として機能します.
研究 の 目的:
- アラビドプシスの加入における昼間の時計のパラメータ (周期,相,振幅) の自然な変動の範囲を調査する.
- 地理的起源と昼間の長さとの関係における昼間の時計の変動の適応的意義を探求する.
- シルカディアン・クロックの特徴の変動を元にした遺伝的位置を特定する.
主な方法:
- 150種のアラビドプシスの加入における昼間の時計のパラメータのフェノタイプ分析.
- 時計のパラメータと起源の緯度/日の長さの相関分析.
- リコンビナント・インブレッド・ラインにおける定量特質ロシ (QTL) 分析.
- アラビドープシスの擬似反応調節器 (APR) 遺伝子の機能喪失分析.
主要な成果:
- アラビドプシスのアセシオンにおける昼間の時計の周期,相,振幅において,自然に顕著な変化が観察されました.
- 周期の長さは,起源の緯度における昼間の長さとの相関を示し,適応的意義を示唆した.
- QTL分析は,複数の相互作用するロシがこれらのクロックパラメータを制御していることを明らかにしました.
- APR遺伝子の機能喪失変異は,それらを時計QTLの潜在的な候補として関与させた.
結論:
- シルカディアン・クロック・タイミングの自然な変動は,異なる地理的な場所での植物フィットネスの重要な要因です.
- シルカディアンクロック遺伝子は,特にAPRファミリーのメンバーは,期間,相,振幅の決定に重要な役割を果たします.
- これらの遺伝的基盤を理解することで,作物の適応と改良のための戦略を策定することができます.
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