干旱地区农业研究2016，Vol.34Issue(6)：209-214,6.DOI:10.7606/j.issn.1000-7601.2016.06.32
干旱复水对棉花苗期抗氧化系统及光合荧光参数的影响
Effects of drought and rewatering on antioxidant system and photosynthetic fluorescence parameters of cotton seedling
摘要
Abstract
In order to study the effects of water stress on photosynthesis and associated physiological characteristics of cotton,and to reveal the relationships between photosynthetic traits,physiological indexes and drought tolerance,drought and rewatering treatments were employed on Xinluzao 19 by weighting the pot to control water amount.The treatmeres included drought for 0,2,4,6,8 d and rewatering for 2 d,then the changes in MDA content,H2O2 content,SOD,POD,and CAT indexes and photosynthetic fluorescence parameters of cotton were measured.Reactive oxygen,conductivity and MDA content of cotton leaf were increased with the enhancement of drought stress.Except for H2O2 content,the others were reduced to the control values after rewatering.SOD and CAT of antioxidant enzymes reached the highest activities to clear the excessive reactive oxygen species when the active oxygen content was the highest in cotton leaf.The photosynthesis,stomatal conductance and transpiration rate of cotton function leaf became decreased with the increase of drought stress,and reached the lowest at the 8 th day after drought,then rebounded after rewatering.Photochemical quenching (qP) and yield were reduced with the severity of drought stress,and could not become rebounded after rehydration.Obviously,excessive reactive oxygen species were cleared by increasing the antioxidant activity of cotton under water stress through controlling the stomatal conductance to inhibit photosynthesis and transpiration rate of cotton under water stress.关键词
干旱胁迫/复水/棉花/活性氧/抗氧化酶/光合参数/叶绿素荧光参数Key words
drought stress/rewatering/cotton/reactive oxygen/antioxidant enzymes/photosynthetic/chlorophyll fluorescence parameters分类
农业科技引用本文复制引用
田又升,谢宗铭,张建新,董永梅,李有忠,于航,王志军,张成双..干旱复水对棉花苗期抗氧化系统及光合荧光参数的影响[J].干旱地区农业研究,2016,34(6):209-214,6.基金项目
国家国际科技合作专项(2011DFA32800) （2011DFA32800）
新疆农垦科学院青年基金(YQJ201302) （YQJ201302）
