Effects of Leaf-to-fruit Ratio on Photosynthetic Characteristics of'Xinxin2'Walnut Leaves
The source-sink relationship coordinates fruit tree yield through the transport and distribution of assim-ilates and the capture of light energy.In response to the widespread issue of an unreasonable leaf-to-fruit ratio in early-bearing walnut trees in Xinjiang,this study investigated the photosynthetic characteristics of walnut leaves under different leaf-to-fruit ratios using the'Xinxin2'walnut as the research subject.Measurements were taken at 30,60,90,and 120 days after flowering.The study found that when the number of leaves per fruit-bearing branch was 1～2,the values of Pn(photosynthetic rate)and Gs(stomatal conductance)increased with the increase in leaf-to-fruit ratio.When the number of leaves was 3～4,the Pn value was higher and peaked,with no significant dif-ference in Pn between branches bearing 2 and 3 fruits.When the number of leaves was 5,there was a significant negative correlation between the leaf-to-fruit ratio and the values of Pn and Gs.The results indicate that when the leaf-to-fruit ratio is(1～2)L:(2～3)F,the photosynthetic capacity of the leaves is weaker,while a leaf-to-fruit ratio of(3～5)L:(1～2)F results in stronger photosynthetic capacity.Within an appropriate leaf-to-fruit ratio range,i.e.,a cer-tain number of fruits and 3～5 leaves,changes in the leaf-to-fruit ratio do not significantly affect leaf photosynthe-sis.This study provides a reference for determining a reasonable leaf-to-fruit ratio in walnuts and offers a theoreti-cal basis for walnut tree pruning and load determination.
NETL
NSTL
万方数据
