关键词: 茶树, 引进品种, 净光合速率, 光补偿点, 光饱和点, 光合日变化

Abstract: Photosynthetic physiology index and diurnal change of photosynthesis, in 11 tea cultivars in Sichuan, which were introduced form Zhejiang and Fujian, such as Pingyangtezao, Wuniuzao and Yuanxiaocha, were studied. The photosynthetic light-response curve of different cultivars was also simulated. The results show that net photosynthetic rate(Pn), transpiration rate(Tr), stomatal conductance(Gs), intracellular concentration of CO₂(Ci), water use efficiency of cultivars and the light saturation point in leaves of 11 cultivars are different[430.61~1738.39 μmol/(m²·s)] and had obvious differences. respectively, the light compensation point is similar[9.4256~37.3298 μmol/(m²·s)]. Diurnal change of net photosynthetic rate among cultivars are different, seven cultivars show twin-peaked curve with an obvious midday-depress, others show single peak curves. Pingyangtezao, Yuanxiaocha, Wuniuzao, Chunbolv and Longjingchangye have high net photosynthetic rate(Pn), transpiration rate(Tr) and stomatal conductance(Gs) show high photosynthetic and potential productivity, they also have low light compensation point and high light saturation point, show high capacity of using light. In a word, based on photosynthetic characteristics, the five tea cultivars are adapt to growing in Sichuan and need to extend growing areas.

Key words: tea plant, introducing tea breed, net photosynthetic rate, light compensation point, light saturation point, diurnal change of photosynthesis