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NaCl胁迫对甘薯叶片叶绿体超微结构及一些酶活性的影响

柯玉琴, 潘廷国

福建农业大学基础部.福建,福州 350002

摘要

随NaCl胁迫浓度的提高,甘薯叶片叶绿体数目逐渐减少,类囊体膜片层松散、扭曲、破裂并逐渐解体,叶绿素含量下降。与此同时,H_(2)O_(2)、MDA含量增加,ASP、SOD活性表现出先上升后下降的趋势。耐盐品种在NaCl胁迫下能维持较强的H_(2)O_(2)清除能力和较低的MDA水平。

关键词： NaCl胁迫; 甘薯; 叶绿体超微结构; ASP; SOD; H_(2)O_(2); MDA

Effects of salt stress on the ultrastructure of chloroplast and the activities of some protective enzymes in leaves of sweet potato

Ke Yuqin, Pan Tingguo

Department of Fundamental Subjects,Fujian Agricultural University.Fuzhou 350002,Fujian

Abstract

With the increase of NaCl concentration, the number of chloroplasts of sweet potato leaves decreased, the lamellae were loosened, twisted, ripped and disintegrated gradually, the content of chlorophyll declined, the activities of ASP and POD increased first and then decreased, H_(2)O_(2) accumulated, and MDA content rose, which resulted from the peroxidation of the cell membrane. Under high NaCl stress, the salt-tolerant cultivar Xushu 18 was harmed less seriously which could be explained by the fact that its ASP and SOD activities were still high enough to scavenge H_(2)O_(2), resulting in lower H_(2)O_(2) and MDA contents and higher chlorophyll content than in the salt-sensitive one.

Key words: NaCl stress;Sweet potato;Ultrastructure of chloroplasts;Ascorbate peroxidase;Superoxide dismutase;Hydrogen peroxide;Malondialdehyde

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引用本文：

柯玉琴, 潘廷国. NaCl胁迫对甘薯叶片叶绿体超微结构及一些酶活性的影响[J]. 生理学报 1999; 51 (3): .

Ke Yuqin, Pan Tingguo. Effects of salt stress on the ultrastructure of chloroplast and the activities of some protective enzymes in leaves of sweet potato. Acta Physiol Sin 1999; 51 (3): (in Chinese with English abstract).