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緑の藻類における高濃度のCO2で1000世代に渡る選択のフェノタイプ的な結果

Sinéad Collins¹, Graham Bell

¹Biology Department, McGill University, Montreal, Quebec H3A 1B1, Canada.

|October 1, 2004

まとめ

世界的な植物生産の見積もりは,大気中の二酸化炭素 (CO2) の上昇への適応によって偏りがある可能性があります. 長期的な実験では,いくつかの藻類が,通常のCO2レベルでの成長に有害な特性を進化させたことが示されています.

科学分野:

植物生理学植物生理学
進化生物学の進化生物学について
気候変動科学気候変動科学

背景:

将来の世界の植物生産の見積もりは,大気中のCO2濃度の上昇に対する植物反応に依存する.
植物集団は,変化する大気条件に適応し,遺伝的に異なる将来のコミュニティにつながる可能性があります.
これらの進化したコミュニティの性質は不明であり,炭素プールダイナミクスの予測をバイアスさせる可能性があります.

研究の目的:

増加したCO2濃度での成長のための長期的な選択の現象的影響を調査する.
植物集団が将来の大気条件にどのように適応するかを理解する.
グローバルな炭素サイクルモデルに対する適応の潜在的な影響を評価する.

主な方法:

単細胞の緑藻クラミドモナスを用いて長期選択実験を行った.
選別ラインは,約1,000世代にわたって,高濃度のCO2 (百万分1050) に曝された.
光合成,呼吸,クロロフィール含有量,細胞サイズを含むフェノタイプの特徴が測定されました.

主要な成果:

クラミドモナスの選択線は,高濃度のCO2に特異的な適応を進化させることができなかった.
いくつかの線は,高光合成と呼吸率,クロロフィール含有量増加,細胞サイズ減少によって特徴づけられるシンドロームを進化させた.
これらの進化した線は,周囲のCO2濃度で低い成長を示した.

結論:

観察されたフェノタイプの変化は,炭素濃度メカニズムに関連する遺伝子の条件性中性変異の蓄積に起因する可能性があります.
CO2の増加への適応は,トレードオフにつながり,異なる環境条件下でプラントの性能に影響を与える可能性があります.
これらの発見は,気候変動に対する植物コミュニティの反応と,その影響が世界の炭素循環に及ぼす影響を予測する際の複雑さを強調しています.

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