叶果比对'新新2号'核桃叶片光合特征的影响
Effects of Leaf-to-fruit Ratio on Photosynthetic Characteristics of'Xinxin2'Walnut Leaves
陈虹 1孙守霞 1张述斌 1吕威 1周光辉 1杨丽 1潘存德1
作者信息
- 1. 新疆农业大学林学与风景园林学院,新疆教育厅干旱区林业生态与产业技术重点试验室,乌鲁木齐,830052
- 折叠
摘要
源库关系通过对光合同化物的运输、分配及光能的捕获协调果树产量,针对新疆早实核桃普遍存在叶果比不合理的现象,本研究以'新新2号'核桃为研究对象,分别于花后30、60、90、120d进行不同叶果比下核桃叶片光合特性测定.研究发现,结果枝叶片数目为1～2片时,叶片Pn、Gs值随着叶果比的增大而增大;叶片数目为3～4片时,叶片的Pn值较高并出现峰值且2果和3果结果枝上叶片Pn之间差异不显著;叶片数目为5片时,叶果比与Pn、Gs值呈显著负相关.结果表明,核桃叶果比为(1～2)L:(2～3)F时,叶片的光合能力较弱,叶果比为(3～5)L:(1～2)F时叶片的光合能力较强.合适的叶果比范围内,即果实数量一定,叶片数量为3～5时,叶果比的改变对叶片光合作用无显著影响.本研究为核桃合理的叶果比提供参考,为核桃树整形修剪、确定合理负载量提供理论依据.
Abstract
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.
关键词
核桃/叶果比/叶片/光合特征Key words
Walnut/Leaf-to-fruit ratio/Leaves/Photosynthetic characteristics引用本文复制引用
基金项目
国家自然科学基金项目(31760219)
国家自然科学基金项目(31960325)
2018年自治区天山青年计划项目(2018Q020)
2017年自治区高校科研计划(重大项目)(XJEDU2017I006)
2021年自治区天山英才计划项目()
新疆农业大学博士后流动站()
出版年
2024
NETL
NSTL
万方数据