Effects of Triacontanol on Photosynthesis of Apricot Trees

Apricot trees were used in this experiment to study the effects of different concentrations of triacontanol(TA) on photosynthesis of the trees.The results showed that there were two peaks in the diurnal variations of net photosynthetic rate(Pn),stomatal conductance(Gs),transpiration rate(Tr) and intercellular carbon dioxide concentration(Ci),the sequence of Pn,Gs and Tr was 1.0 mg·L-1 0.5 mg·L-1 0.3 mg·L-1 0.1 mg·L-1 CK 3.0 mg·L-1,while the sequence of Ci was 3.0 mg·L-1 1 mg·L-1 0.5 mg·L-1 0.3 mg·L-1 0.1 mg·L-1 CK.With the increase of TA concentration,water use efficiency(WUE) and stomatal limitation value(Ls) increased.Different concentration of TA had different results to chlorophyll content,only 3.0 mg·L-1 was significant.The suitable concentration for spraying was 1.0 mg·L-1.