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Effects of water stress on activated oxygen metabolism in loquat leaves

Luo Huajian; Liu Xinghui; Xie Houcai(Department of Horticulture, Fujian Agricultural University, Fuzhou 350002)  
Grafted seedlings of two lequat varieties (Jiefangzhong and Changhong No. 3 ) were used in this study. Under water stress, the relative water content (RWC) and water potential (ψL) in leaves decreased. the generation rate of O, lipid peroxidation and the contents of malondialdehyde (MDA) increased, so cells were damaged. Meanwhile, the activities of superoxide dismutase (SOD) and peroxidase (POD) increased; the activities of catalase (CAT), the contents of reduced glutathione (GSH) and ascrobate (AsA) different between two varieties. The activities of CAT in Jiefangzhong's leaves increased under light water stress, but decreased markedly than those in the control under moderate or severe water stress, while those in Changhong No. 3 kept much higher level than those in the control under water stress. The contents of GSH and AsA in Jiefangzhong's leaves decreased markedly under water stress, but those in Changhong No. 3's increased much under light or moderate water stress. Under severe water stress, the contents of GSH in Changhong No. 3's decreased, but the contents of AsA were still higher than those in the control.
【CateGory Index】: S667.3
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