Photosynthetic characteristics and chlorophy II fluorescence parameters of different populations of Pinellia ternata.

Objective: To study the photosynthetic characteristics and chlorophyll fluorescence parameters of Pinellia ternate from different sources,in order to provide basis for cultivation and breeding.Method: Pigment contents were compared among different sources by the Lichtenthaler method.The light-response and diurnal photosynthesis course of P.ternata from different sources were analyzed by LI-6400 system,and chlorophll fluorescence parameters were analyzed by PAM-2100 system.Result: The difference of photosynthetic characteristics among the sources were remarkable.The light compensation point(LCP) of P.ternate from different sources were 11.57-17.88 μmol·m-2·s-1,the light saturation point(LSP) were 1 000-1 300 μmol·m-2·s-1.All the sources have obvious "midday depression".P.ternate cultivated in Xinjiang showed a higher light saturation point(LSP) and better chlorophyll fluorescence parameters.Conclusion: P.ternata cultivated in Xinjiang showed better photosynthetic characteristics and chlorophyll fluorescence parameters than the others.