| The photosynthetic properties of grapevine cultivar Cabernet Franc that were planted in the plastic pots on August,2004 were studied at certain stages under water stress with different soil relative water concentrations(50%,40% and 30%).The photosynthetic indexes and the content of photosynthetic pigments were detected.The results indicated that with the prolonging of water stress,the net photosynthetic rate(Pn),transpiration rate(Tr),stomatal conductance (Gs) and intercellular CO2 concentration(Ci) declined without exception,and the photosynthetic efficiency of grapevine declined with the aggravating of stress degree.The content of photosynthetic pigments was also reduced with the prolonging of stress time and the aggravating of stress degree.The ratio of Chl.a/Chl.b was comparatively stable,and the changing range of carotenoid was limited. |