アラビドプシスの過剰な興奮エネルギーに対する反応として,全身のシグナル伝達と適応

S Karpinski¹, H Reynolds, B Karpinska

¹Department of Forest Genetics and Plant Physiology, Faculty of Forestry, Swedish University of Agricultural Sciences, SE-901 83 Umeâ, Sweden. stanislaw.karpinski@genfys.slu.se

Science (New York, N.Y.)

|April 24, 1999

まとめ

植物は,過剰な光のストレスを非暴露の葉にシステム的に伝達し,保護的な抗酸化防御を誘発することができます. この全身的に得られた適応は,植物が将来の光酸化的損傷から防御するのを助けます.

科学分野:

植物生理学植物生理学
分子生物学は分子生物学である.
環境ストレス反応環境ストレス反応

背景:

陸上の植物は,環境の変化に対する洗練された適応メカニズムを示しています.
光合成は余分な光に弱いので,光酸化ストレスが発生します.
植物におけるシステミック・シグナリングは,反応の調整に極めて重要です.

研究の目的:

アラビドプシスの過度の光ストレスによる全身的伝達を調査する.
体系的に習得された適応に関与する重要な要素を特定する.
露出していない葉が,植物の他の部分のストレスにどのように警告されるかを理解するために.

主な方法:

アラビドプシスの植物は,部分的に過剰な光にさらされた.
光学系IIの近くの酸化還元状態の全身的変化をモニタリングした.
酸化水素濃度と抗酸化物質の遺伝子発現は,未暴露の葉で分析されました.

主要な成果:

部分的な過度の照明曝露は,未曝露の葉の全身的適応を誘発した.
系統的リドックス変化と過酸化水素の蓄積が観察されました.
遠隔の未暴露の組織で抗酸化防御のアップレギュレーションが発生しました.

結論:

植物には,過剰な興奮エネルギーのシステム通信のためのメカニズムがあります.
このシグナル伝達は,光酸化ストレスに対する予防的防御を可能にします.
システム的に獲得された慣習は,リドックス信号と抗酸化物質誘導によって媒介されます.

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