In order to study the effect of high temperature stress on the photosynthesis rate,fluorescence characteristics,antioxidant enzyme activities and cell injury rates of Camellia sinensis in south region of the Yangtze River,four varieties of tea trees such as Fuding dabaicha,Jiukeng,Longjing 43 and Wuniuzao were investigated under different high temperature stress（35℃ and 40℃,with 25℃ as control）in artificial climate box for 6,12,18,24,48 hours,then recovered for 9 days.The results showed that high temperature stress inhibited the maximum net photosynthetic rate of tea and maximal photochemical efficiency（Fv/Fm） significantly,the maximum net photosynthetic rate and Fv/Fm declined faster when the processing was longer and the temperature was higher.In addition to Fuding dabaicha under 35℃,other varieties of tea could not be recovered to the normal level during a recovery.The SOD activities of Camellia sinensis leaves rose rapidly at the first 12 hours,and then decreased.The average of MDA contents achieved maximum when the temperature were conducted for 48 hours,the leaf cell injury rates increased with high temperature and processing time.The order of the heat resistance among four Camellia sinensis was Fuding dabaichaWuniuzaJiukengLongjing 43.The study provided a basis for scientific research of Camellia sinensis.
Chinese Journal of Agrometeorology
High temperature stress
Antioxidant enzyme activity
Cell injury rates