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水分胁迫下苹果叶片的H_(2)O_(2)代谢

贾虎森, 李德全

山东农业大学生命科学学院.山东,泰安 271018

摘要

轻度水分胁迫下苹果叶片Pr迅速升高,CAT活性变化不大,NaHSO_(3)处理能显著降低叶内H_(2)O_(2)含量,表明光呼吸的加强促进了H_(2)O_(2)产生可能是叶内H_(2)O_(2)大量积累的主要原因;中度水分胁迫下叶片AsA含量的下降和Mehler反应的增强都非常明显,DDTC和AsA处理都能有效降低叶内H_(2)O_(2)积累,但MV处理的作用不大,说明叶片H_(2)O_(2)主要来源于Mehler反应,AsA降解造成叶片对H_(2)O_(2)清除能力的下降是其积累的根本原因;严重水分胁迫时,NaHSO_(3)和DDTC都不能效地减轻叶内H_(2)O_(2)积累,光呼吸和Mehler反应都可能不是H_(2)O_(2)的主要来源。

关键词： 水分胁迫; H2O2代谢; 光呼吸; Mehler反应

H_(2)O_(2) metabolism of apple leaves under water stress

Jia Husen, Li Dequan

College of Life Sciences,Shandong Agricultural University.Taian 271018,Shandong

Abstract

Under slight water stress, rate of photorespiration rapidly rose but CAT activity faintly changed in apple leaves, H_(2)O_(2) content could be decreased obviously when leaves treated with NaHSO_(3).

Key words: Water stress;H_(2)O_(2) metabolism;Photorespiration;Mehler reaction

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引用本文：

贾虎森, 李德全. 水分胁迫下苹果叶片的H_(2)O_(2)代谢[J]. 生理学报 2001; 53 (4): .

Jia Husen, Li Dequan. H_(2)O_(2) metabolism of apple leaves under water stress. Acta Physiol Sin 2001; 53 (4): (in Chinese with English abstract).