Investigations are made into the changes of the semilethal temperature and membrane protective system of the leaves of Rhododendran Foetunei Linell. As temperature falls, the results show that the semilethal temperature decreases. The activity of SOD and CAT increases, thus strengthening the ability of the membrane's protective system to scavenge free radicles. In this way, the level of O2-and the content of MDA decreases. The decline of the semilethal temperature caused by the membrane protective system is...
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