Light-response curves of different apricot cultivars in Xinjiang

In order to research photosynthetic capacity of main apricot cultivars in Xinjiang,taking ten main apricot cultivars in Xinjiang as materials,different photosynthetic parameters were determined by using Li-6400 portable photosynthesis system,and the light response curves were drawed.The results showed that when light intensity increased,net photosynthetic rate,stomatal conductance and transpiration rate in all varieties were increased,but intercellular CO2 concentration was decreased.The photosynthetic indexes existed significant differences among some cultivars,and Xiaobaixing cultivar had more sensitive response to light intensity,with light intensity increasing,it's net photosynthetic rate was increased rapidly.In different light intensities,the photosynthetic rate of Xiaobaixing cultivar was the highest.It's net photosynthetic rat reached the maximum value of 8.66 μmol/(m2·s) when light intensity was 1 800 μmol/(m2·s).The results indicated that Xiaobaixing cultivar was the strongest photosynthetic capacity,photosynthetic rate of Hongteke cultivar was the lowest,and the other cultivars at the middle.