Study on Photosynthetic Characteristics of Three Main Tea Varieties in Western Sichuan Tea Plantation

In this paper,taking Fuding dabaicha as CK,the physiological indexes of photosynthetic,diurnal change of photosynthesis and fitting light response curve of three varieties of the main cultivated tea(mingshan dabaihao,mingshan213 and fuxuan No.9)in western Sichuan,were studied and compared with CK.The results showed that there were significant difference among chlorophyll content,net photosynthesis rate,transpiration rate,stomatal conductance,intercellular CO2 concentration,water using efficiency,respiratory rate,light compensation point,light saturation point between the different varieties.The fuxuan No.9 and mingshan dabaihao indicated higher photosynthetic performance and production potential,excellent photosynthetic characteristics because of their higher chlorophyll content,net photosynthesis rate and stomatal conductance.The diurnal change of photosynthesis of each variety was a single peak curve.The light compensation point of each variety was no more than 25-50 μmol/(m2.s) so that the weak light also could be used.From the perspective of photosynthetic characteristics,all the three varieties could be further promoted in western Sichuan.