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Effect of Na~+ on photosynthetic characteristics of Zygophyllum xanthonylom seedlings under osmotic stress

MA Qing,LOU Jie-qiong,WANG Suo-min (School of Pastoral Agriculture Science and Technology,Lanzhou University,Lanzhou 730020,China)  
The effect of Na+ on the photosynthetic characteristics of seedlings of the succulent xerophyte Zygophyllum xanthoxylum were investigated under-0.5 MPa osmotic stress.Under this stress,the leaf area,chlorophyll (a+b) content,net photosynthetic rate (Pn),stomatal conductance (Gs) and phosphoenolpyruvate carboxylase (PEPCase) activity were significantly elevated by 105%,33%,115%,90%,and 180% respectively at 50 mmol/L NaCl,but the intercellular CO2 concentration (Ci) was significantly reduced by 17%.In addition,the potential photosynthetic activity (Fv/F0),primary light energy conversion efficiency (Fv/Fm),and photosynthetic electron transport rate (ETR) of PSⅡ were enhanced by 15%,5%,and 11% respectively.These results indicate that,under-0.5 MPa osmotic stress,Na+ can improve the photosynthesis of Z.xanthoxylum seedlings and enhance the osmotic stress resistance of plants.
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