棉花学报2025，Vol.37Issue(2)：141-152,12.DOI:10.11963/cs20250015
干旱与下部遮阴对棉花上部叶片光能利用能力的影响
Effect of drought and lower canopy shading on the light energy utilization capacity of upper leaves in cotton
摘要
Abstract
[Objective]This study aimed to explore the impact of drought stress,lower canopy shading,and their interaction on the light energy utilization capacity of cotton leaves.[Methods]The photosynthetic physiological indexes,such as plant height,leaf area,leaf thickness,chlorophyll content,and chlorophyll fluorescence parameters,were measured in an artificial climate chamber under drought stress and lower canopy shading conditions using the cotton variety Xinluzao 80 as the material.[Results]Under moderate and severe drought stress,the shading treatment of the lower canopy in cotton significantly increased the plant height and leaf area of lower leaves,significantly decreased the leaf area of upper leaves and leaf thickness of lower leaves,and simultaneously increased the chlorophyll content of upper and lower leaves,which were conducive to the enhancement of the light energy capture capacity,compared with those under the non-shading treatment.Under moderate and severe drought stresses,the actual quantum efficiency of photosystem Ⅱ(ΦPSⅡ),electron transport rate(ETR),photochemical quenching coefficient(qP),and non-photochemical quenching(NPQ)of the lower leaves under the shading treatment were reduced compared with those under the non-shading treatment.ΦPSⅡ of upper leaves under the shading treatment was increased by 19.4％and 31.4％,respectively;ETR was increased by 19.5％and 31.4％,respectively;and qP was increased by 26.2％and 34.7％,respectively.When shading treatment was applied to the lower leaves,the photochemical reaction in the upper leaves was enhanced under both moderate and severe drought stress.Meanwhile,the heat dissipation capacity of the upper leaves decreased under moderate drought stress but increased under severe drought stress.[Conclusion]The effects of shading treatment on the photosynthetic apparatus of upper leaves were different under different drought stress conditions.Under moderate drought stress,systemic regulation helped to improve the light energy utilization capacity of upper leaves in cotton.关键词
干旱胁迫/棉花/遮阴/系统信号/光能利用能力/叶绿素荧光参数/光保护Key words
drought stress/cotton/shading/system signal/light energy utilization ability/chlorophyll fluorescence parameters/light protection引用本文复制引用
简金金,崔宁,刘天阳,张旺锋,张亚黎..干旱与下部遮阴对棉花上部叶片光能利用能力的影响[J].棉花学报,2025,37(2):141-152,12.基金项目
新疆维吾尔自治区"天山英才"培养计划科技创新人才项目 （）
新疆维吾尔自治区现代农业产业技术体系棉花产业技术体系智慧栽培岗位专家(XJARS-03) （XJARS-03）
