西北农业学报2025，Vol.34Issue(10)：1801-1812,12.DOI:10.7606/j.issn.1004-1389.2025.10.004
灌溉定额对早熟棉品种叶片光合与叶绿素荧光参数的影响
Effects of Irrigation Quotas on Leaf Photosynthetic and Chlorophyll Fluorescence Parameters of Early-maturing Cotton Varieties
摘要
Abstract
To clarify the effects of different irrigation quotas on the photosynthetic and fluorescence parameters of early-maturing cotton varieties,a plot experiment was conducted in 2023 using a split-plot design with five irrigation treatments:W1(2 700 m3·hm-2),W2(3 600 m3·hm-2),W3(CK,4 500 m3·hm-2),W4(5 400 m3·hm-2),W5(6 300 m3·hm-2).The subplot included two early-maturing upland cotton varieties(V1:'Xinluzao 61',V2:'Jinken 1775').The responses of gas ex-change parameters,chlorophyll fluorescence parameters,photosynthetic pigment content and canopy leaf temperature to different irrigation quotas were systematically explored to provide a theoretical ba-sis for systematic water management during the cotton growth period.The results showed that(1)the net photosynthetic rate(Pn),stomatal conductance(Gs)and transpiration rate(Tr)of the cotton leaves remained high at the budding stage under the different treatments,and those under the W1 treatment decreased first and then increased from the initial flowering stage to the full boll stage,while those under the W2-W5 treatments showed a decreasing trend overall.Leaf water use efficiency(WUEins)and the stomatal restriction value(Ls)first increased and then decreased with cotton growth and decreased with increasing irrigation quota.The diurnal variation in Pn,Tr and Gs de-creased significantly under the W1 treatment,the photosynthetic"lunch break"phenomenon occurred at approximately 12:00,the diurnal variation in WUEins showed a downward trend,and the lower the irrigation quota was,the greater the observed diurnal variation.The decrease in Pn in the W1 treat-ment was accompanied by an increase in Ls,which was mainly affected by stomatal restriction fac-tors.(2)The maximum photochemical efficiency(Fv/Fm)and actual quantum yield(ΦPSⅡ)of leaf photosystem Ⅱ(PS Ⅱ)from the bud stage to the boll stage first increased and then decreased,and those in the W1 treatment decreased significantly,but no photoinhibition occurred.The non-photo-chemical quenching coefficient(NPQ)increased over the growth period and increased significantly un-der the W1 treatment,and heat dissipation increased.(3)The contents of chlorophyll Chl(a+b)and carotenoids(Caro)first increased and then decreased with growth,while those in the W1 and W2 treatments increased significantly,and their overall content in V2 was greater than that in V1 under the same irrigation quota.(4)The leaf temperature(Tleaf)of the cotton canopy increased significantly with decreasing irrigation quota.In conclusion,under drought stress,the photosynthetic performance of cotton decreases,V2 is more sensitive to water shortage,and an appropriate water deficit can in-duce water retention in cotton leaves,alter stomatal conductance without significantly reducing the photosynthetic rate,reduce transpiration and water consumption in plant leaves,and improve the wa-ter use efficiency of leaves.关键词
灌溉定额/早熟棉品种/光合参数/叶绿素荧光参数/冠层叶片温度Key words
Irrigation quotas/Early-maturing cotton varieties/Photosynthesis parameters/Chloro-phyll fluorescence parameters/Canopy leaf temperature引用本文复制引用
周天江,王芳圆,韩焕勇,余渝,傅积海,陈伟明,汤秋香,王方永..灌溉定额对早熟棉品种叶片光合与叶绿素荧光参数的影响[J].西北农业学报,2025,34(10):1801-1812,12.基金项目
国家自然科学基金(32260540) （32260540）
兵团科技创新人才计划(2023CB007-05) （2023CB007-05）
科技创新团队(天山创新团队)项目. National Natural Science Foundation of China(No.32260540) （天山创新团队）
Science and Tech-nology Innovation Talent Program of Xinjiang Production and Construction Corp(No.2023CB007-05) （No.2023CB007-05）
Science and Technology Innovation Team(Tianshan Innovation Team)Project. （Tianshan Innovation Team）
