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强光及外源活性氧对莴苣叶绿素荧光的影响

摘要

莴苣叶绿体在强光处理下发生光抑制,主要表现为叶绿素荧光参数Fv/Fm和#PHI#PSII降低;外源活性氧H_(2)O_(2)、O~(.)_(2)、·OH和~(1)O_(2)均能引起叶绿体PSII光化学效率Fv/Fm不同程度的下降,其中以~(1)O_(2)影响最明显;H_(2)O_(2)在诱导叶绿体荧光猝灭过程中,引起荧光产量降低,而使q_(P)、q_(N)、#PHI#PSII、K_(D)上升;在H_(2O_(2)诱导的叶绿体荧光猝灭过程中,Fe~(2+)能使q_(N)和K_(D)低于对照;由于~(1)O_(2)的产生对PSII反应中心造成了损伤,引起q_(P)和#PHI#PSII下降。

关键词： 外源活性氧; 光抑制; 强光; 叶绿素荧光; 叶绿体

Effects of strong light and exogenous active oxygen species on chlorophyll fluorescence in lettuece

Abstract

The relationship between active oxygen species and photoinhibition in chloroplasts by using chlorophyll fluorescence technique has been studied.

Key words: Exogenous active oxygen species;Photoinhibition;Strong light;Chlorophyll fluorescence;Chloroplasts

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引用本文：

. 强光及外源活性氧对莴苣叶绿素荧光的影响[J]. 生理学报 1998; 50 (3): .

. Effects of strong light and exogenous active oxygen species on chlorophyll fluorescence in lettuece. Acta Physiol Sin 1998; 50 (3): (in Chinese with English abstract).