排灌机械工程学报2025，Vol.43Issue(8)：826-832,7.DOI:10.3969/j.issn.1674-8530.24.0077
水分胁迫对茶树幼苗光合特性与叶绿素荧光参数的影响
Effects of water stress on photosynthetic characteristics and chlorophyll fluorescence parameters of tea seedlings
摘要
Abstract
To achieve water-saving irrigation and effective evaluation of water stress in greenhouse tea seedlings,one-year-old″Suchazao″tea plants were selected as experimental material.Non-stressed con-trol(NS),mild(LS),moderate(MS)and severe(SS)water stress treatments were established.The changes in gas exchange parameters,chlorophyll fluorescence parameters,water potential(ψw),and leaf relative water content(RWC)are systematically investigated under different water conditions.The results show that as water stress intensifies,significant decreases were observed in net photosynthetic rate(Pn),stomatal conductance(Gs),and transpiration rate(Tr),while intercellular CO2 concen-tration(Ci)remains stable.Water potential(ψw)decreases significantly with increasing stress levels.No significant difference is detected in the actual quantum yield of PSⅡ(YⅡ)between NS and LS treatments.However,significant reductions are observed under MS and SS treatments.The maximum photochemical efficiency of PSⅡ(Fv/Fm)gradually decreases with stress severity,with no significant difference between LS and MS treatments.The photochemical quenching coefficient(qP)and quantum yield of non-regulated energy dissipation Y(NO)initially increase and then decrease with stress pro-gression.In contrast,the non-photochemical quenching coefficient(qN)and quantum yield of regulated energy dissipation Y(NPQ)first decrease and then increase.All parameters except Y(NO)and Ci show significant positive correlations with water availability.Among different stress le-vels,water potential(ψw)is identified as the most sensitive indicator.Other parameters exhibit varying sen-sitivity:Pn,Y(NPQ)and qNare most responsive to mild stress,Tr,Pn and Gs show higher sensitivi-ty to moderate stress,while Tr and Gs demonstrate the strongest response to severe stress.These indica-tors can serve as diagnostic criteria for different water stress levels.关键词
茶树幼苗/水分亏缺/气体交换参数/叶绿素荧光参数Key words
tea seedlings/water deficit/gas exchange parameters/chlorophyll fluorescence parameters分类
农业科技引用本文复制引用
胡永光,郑家椋,潘庆民,金矿,李友勇..水分胁迫对茶树幼苗光合特性与叶绿素荧光参数的影响[J].排灌机械工程学报,2025,43(8):826-832,7.基金项目
江苏省重点研发计划项目(BE2021340) （BE2021340）
