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植物におけるストレスのトランスジェネレーション記憶
Jean Molinier1, Gerhard Ries, Cyril Zipfel
1Friedrich Miescher Institute for Biomedical Research, Maulbeerstrasse 66, CH-4058 Basel, Switzerland.
Nature
|August 8, 2006
まとめ
環境的ストレスが植物に恒久的なゲノム変化を引き起こす可能性があります. 強化された同類再結合を含むこれらの変化は,継続的なストレスなしに子孫に受け継がれ,潜在的に適応を助けます.
科学分野:
- 植物生物学 植物生物学
- 遺伝学 遺伝学とは
- 環境科学 環境科学
背景:
- 植物は,光,水,塩,温度,病原菌などの環境的ストレスに直面しています.
- ストレスは植物生理学とゲノムを変化させることができますが,ゲノム変化の世代間継承は不明でした.
研究 の 目的:
- 植物におけるストレス誘発のゲノム変化が世代を超えて遺伝するかどうかを調査する.
- 環境要因が後の未治療世代でゲノムの柔軟性を高めることができるかどうかを判断する.
主な方法:
- アラビドプシス・タリアナは紫外線C放射線またはフラゲリンで治療された.
- トランスジェニックのレポーターにおけるソマティック・ホモロゴス・リコンビネーションを測定した.
- 母系と父系経由による再結合変化の遺伝性は評価された.
主要な成果:
- 紫外線Cまたはフラゲリンの治療により,体内の同類性再結合が増加しました.
- 増えた再結合レベルは,治療を受けていない後の世代でも持続した.
- この表遺伝的特徴は,母と父から受け継がれ,支配的であった.
結論:
- 環境要因は,世代を超えて持続するゲノムの柔軟性を誘発します.
- この遺伝性ハイパー再結合状態は,植物の適応可能性を高める可能性があります.
- ゲノムの変化は,ストレスの継続的存在やトランスジェニックアレルの存在に依存しません.
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