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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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Citing This Article：

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).