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Effect of Osmotic Stress on Photosynthctic Pigment and Level of Menbranc-Lipid Pcroxidation in Rice Seedlings

Jiang Mingyi' Jing Jiahai Wang Shaotang(Department of Basic Course)  
Drought resistant paddy rice cullivar Xiang NO. 1 and drought sensitive upland rice cultivar 763612 were used in conducting PEG 6000 osmotic strcss.Thc experiment results showed that in the case of treatment under osmotic strcss(-0.5MPa),thc permeability of plasma mcmbrancc and malondialdchydc (MDA) contents of two cultivars incrcascd.whilc Chi. and Car contents of two cultivars decreased to a certain extent with the ratio between chl a/ b and Chi / Car remained almost unchanged; and that in the case of treatment under osmotic stress (-0.8MPa),thc permeability of plasma mcmbrancc and malondialdchydc (MDA) contents of two cultivars increased greatly, while Chl. and Car ccntcnts of two cultivars dropped drastically. The ratio between Chl a / b and Chl / Car tends to rise/There also appeared to have sonic certain difference anong rice cultivars with different drought rcsistancc.Undcr osmotic strcss.thcrc seemed to have a certain negative correlation between the content of phytosynthctic pigment in plant and level of mcmbranc-lipid pcroxidation.but ethane was not released in the experiment.
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