Photosynthetic Characteristics and Leaf Photosynthesis Response to Fruit of 'katy'and '9803' Apricots in Greenhouse
Photosynthetic characteristics of two apricot cultivars 'katy' and '9803' were studied comparatively with the LI-6400 photosynthetic instrument in greenhouse. The results were as follows : In greenhouse, the curve of diurnal change of net photosynthetic rate in leaves of 'katy' showed single peak. The diurnal change of net photosynthetic rate in leaves of ' 9803' was a bimodal curve regulated by stomatal conductance. The responsive curve of photosynthesis in two apricot cultivars' leaves to the change of photosynthetic active radiation,concentration of CO2 could be described with quadratic equation. The light compensation point and light saturation point of '9803' were lower than those of 'katy',and its apparent quantum yield was higher. The CO2 compensation point and CO2 saturation point of 'katy' were lower than those of '9803', and its carboxylation efficiency and maximal net photosynthetic rate were higher. This showed that there was diffent predominance in two apricot cultivars in greenhouse. The effect of de-fruiting on net photosynthetic rate of source leaf at upper new shoot was greater than that of source leaf at lower new shoot. The effect of defruiting on net photosynthetic rate of source leaf at seventh and eighth node of upper new shoot was greatest.
NETL
NSTL
万方数据
维普
