江西农业大学学报2018，Vol.40Issue(3)：472-478,7.DOI:10.13836/j.jjau.2018062
高温下猕猴桃光合作用和叶绿素荧光特性的日变化
Diurnal Variation of Photosynthesis and Chlorophyll Fluore?Scence Characteristics in Kiwifruit Under High Temperature Condition
摘要
Abstract
In order to explore the photosynthetic adaption mechanisms of kiwifruit to high?temperature stress,the diurnal variation of photosynthetic parameters and chlorophyll fluorescence characteristics were meas?ured.Some of the kiwifruit cultivars such as Actinidia eriantha 'Ganmi 6',A.chinensis 'HongYang''JinYan',and A.deliciosa 'JinKui' were treated in summer.The results showed that the phenomena of net photosynthetic rate (Pn),stomatal conductance (Gs),transpiration rate (Tr) and concentration of intercellular carbon diox-ide (Ci) decreased under the high temperature stress；simultaneously,the initial fluorescence (Fo) and non-photochemical quenching coefficient (NPQ) increased.Furthermore,the maximum fluorescence (Fm),photo-chemical quenching coefficient (qP),apparent electron transport rates (ETR) and actual photochemical effi- ciency of PSⅡ(Yield) also had a decline at the same conditions.Only the non-regulatory energy dissipation Y(NO) remained stable.These results suggested that the photosynthesis of kiwifruit was very sensitive to heat stress and continuous heat stress could disrupt the normal function of PSⅡ.The Pn(20.76 μmol／ (m2·s) and NPQ of'Ganmin 6'were highest than those of others under the high temperature stress,while the Gs and Tr of it were lower than those of 'HongYang' 'JinYan',and 'JinKui'.The photosynthesis of kiwifruit was mainly limited by stomatal opening under the high temperature stress,kiwifruit could dissipate excessive light energy by thermal dissipation to adapt high temperature conditions.It could be comprehensively concluded that the best cul-tivar with heat resistance in this study was the A.eriantha 'Ganmi 6'.关键词
猕猴桃/光合作用/叶绿素荧光/高温胁迫Key words
kiwifruit/photosynthesis/chlorophyll fluorescence/high⁃temperature stress分类
农业科技引用本文复制引用
钟敏,张文标,邹梁峰,黄清,陈璐,黄春辉,陶俊杰,徐小彪..高温下猕猴桃光合作用和叶绿素荧光特性的日变化[J].江西农业大学学报,2018,40(3):472-478,7.基金项目
国家自然科学基金项目(31760559)、江西省科技厅重大科技专项(20143ACF60015)、江西省猕猴桃产业技术体系建设专项( JXARS?05)和江西省自然科学基金项目( 20151BAB204032) Project supported by the National Natural Science Foundation of China(31760559),Jiangxi Major Science and Technology Project (20143ACF60015),Construction of the Kiwifruit Industry Technical System in Jiangxi (JX?ARS?05) and Natural Science Foundation of Jiangxi( 20151BAB204032) （31760559）
