安徽农业科学2017，Vol.45Issue(19)：3-6,4.
NaCl与Ca(NO3)2等渗胁迫对豇豆新老叶光合特性的影响
Effects of NaCl and Ca(NO3)2 Isotonic Stress on Photosynthetic Characteristics in New Leaves and Old Leaves of Cowpea
摘要
Abstract
[Objective]To discuss the effects of isotonic stress of NaCl and Ca(NO3)2 on photosynthetic characteristics in new leaves and old leaves of cowpea.[Method]Taking nutrient solution culture method,the response of the photosynthesis of cowpea to Ca(NO3)2 and NaCl isotonic stress was studied by measuring the dynamic changes of chlorophyll and chlorophyll fluorescence parameters of cowpea in this study. [Result]Two kinds of salt treatments had no significant effect on the chlorophyll content in old leaves.In the new leaves,chlorophyll content decreased under NaCl stress,and increased slightly under Ca(NO3)2 stress. NaCl stress significantly reduced Fv / Fm and Y(Ⅱ)of the new leaves and old leaves,and caused irreversible photo inhibition to the old and new leaves. qP of the old leaves was significantly reduced,and qPin new leaves was not reduced,indicating that the salt damage degree and the protective mechanism of the new leaves and old leaves might be different.Under the stress of Ca(NO3)2,there was no significant difference in Fv / Fm between the new leaves and old leaves,and qN was significantly increased,indicating that Ca(NO3)2 stress did not cause irreversible photo inhibition of the old leaves and new leaves, and all leaves adapted to the salt stress environment by changing the photosystem Ⅱ excitation energy distribution. Y (Ⅱ)and qP of the old leaves were slightly lower than that of control at late period,while the new leaves had no obvious changes.The old leaves were more severely damaged than the new leaves.[Conclusion]Two kinds of salt stress did not affect the chlorophyll content in the old leaves,but the damage of the PSⅡ of old leaf under salt stress was more serious than that of the new leaf,and the damage of NaCl stress to cowpea seedlings was greater than that of Ca(NO3)2 stress under isotonic conditions.关键词
等渗胁迫/豇豆/光合作用/叶绿素荧光参数Key words
Isotonic stress/Cowpea/Photosynthesis/Chlorophyll fluorescence parameters分类
农业科技引用本文复制引用
曾文静,汪李平,杨静..NaCl与Ca(NO3)2等渗胁迫对豇豆新老叶光合特性的影响[J].安徽农业科学,2017,45(19):3-6,4.基金项目
湖北省现代农业产业技术体系项目. （）
