新疆主栽杏品种的光响应曲线

Light-response curves of different apricot cultivars in Xinjiang

为了探究新疆主栽杏品种的光合能力,以新疆10个主栽杏品种为试材,用Li-6400型便携式光合作用测定系统,测定了其不同光合参数,并绘制相应响应曲线。结果表明:当光照强度增加时,各品种叶片净光合速率、气孔导度、蒸腾速率均随之增加,而胞间CO2浓度随之下降,上述光合指标在个别品种间存在显著差异,其中小白杏对光照强度反应较为敏感,随着光照强度的增加,净光合速率迅速增加。在不同光照强度下,小白杏的光合速率均最高,在光照强度为1 800μmol/(m2·s)时光合速率达到最大值,8.66μmol/(m2·s)。说明小白杏的光合能力最强,洪特克的光合速率较低,其它品种的光合速率居中。

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 ~tmol/（m2os）. 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.