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C_4 Photosynthetic Enzymes and Antioxidant Enzymes Activities in Two Photosynthetic Subtypes of C_4 Desert Plants under Soil Drought Stress

WEN Zhibin;ZHANG Mingli;Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Key Laboratory of Biogeography and Bioresource in Arid Land;Institute of Botany,Chinese Academy of Sciences;  
Two photosynthetic subtypes of C4 desert plants,including NADP-malic enzyme(NADP-ME)Salsola rosacea and NAD-malic enzyme(NAD-ME)S.subcrassa,were used to investigate the adaptive mechanism of C4 photosynthetic enzymes and antioxidant enzymes in respond to soil drought stress.The results showed that:(1)leaf water content decreased as increasing of drought stress;(2)the phosphoenolpyruvate carboxylase(PEPC)activity increased markedly under moderate drought stress and decreased sig-nificantly under severe drought stress;the NAD-ME activity of S.rosaceaand NADP-ME activity of S.subcrassa were very low,and their activities were almost not affected by drought stress;the NADP-ME activity of S.rosacea was declined with increasing of drought stress,but the NAD-ME activity of S.subcrassaincreased firstly and then decreased significantly under severe drought stress;(3)the superoxide dismutases(SOD)activity was declined with increasing of drought stress,and the peroxidase(POD)activity increased under drought stress;the catalase(CAT)activity increased under moderate drought stress,but under severe drought stress,CAT activity of S.rosacea was declined,and that of S.subcrassaincreased significantly;the malondialdehyde(MDA)content arose in different degrees as increasing of drought stress,and MDA content under severe drought stress was significantly lower than that under moderate drought stress.These results have showed that PEPC activity increased under a certain degree of drought stress;decarboxylase(NADP-ME and NAD-ME)belonging to two photosynthetic subtypes showed significant differences in response to drought stress;POD and CAT are the major antioxidant enzymes,but CAT for S.rosacea does not remove H2O2 efficiently under severe drought stress.
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