摘要
本研究以韭菜为试材,研究了外源水杨酸(Salicylic acid,SA)对高温胁迫下韭菜硝酸盐含量及PSⅡ光能吸收利用的影响。结果表明,高温胁迫会抑制韭菜叶片中氮代谢关键酶硝酸还原酶(Nitratereductase,NR)活性,造成韭菜叶片硝酸盐累积加剧。而高温胁迫下喷施SA,韭菜叶片NR活性显著升高,硝酸盐含量明显降低;叶绿素含量、PSⅡ原初光化学效率[Fv/Fm和Y(Ⅱ)]、光化学淬灭系数(qP)、PSⅡ电子传递能力(Q和ETRmax)均显著提高,非光化学淬灭系数(NPQ)显著下降。由此证明,高温胁迫下外源SA能够促进硝态氮的还原同化,同时减轻高温胁迫对PSⅡ反应中心造成的伤害,保持韭菜叶片较高的光能吸收利用效率,从而保证硝酸盐还原同化过程的顺利进行。
Effects of exogenous salicylic acid(SA) on nitrate accumulation and light absorption and utilization of photosystem Ⅱ(PSⅡ) in the leaves of Chinese chive under high temperature stress were studied. The activity of nitrate reductase(NR) in nitrogenous metabolism was depressed under high temperature and the nitrate content was increased. The activity of NR was significantly increased and the nitrate content was decreased obviously by spraying exogenous SA than comparison. At the same time,the chlorophyll content,PS Ⅱ maximal photochemical(Fv/Fm ) ,PSⅡ effective quantum yield [Y(Ⅱ) ],photochemical quenching(qP) ,original quantum efficiencies(Q ) and maximum electron transfer rate(ETR max) significantly increased,but nonphotochemical quenching(NPQ ) decreased obviously. Therefore,exogenous SA showed a positive role in reduction and assimilation of nitrate nitrogen,meanwhile it relieved the damage in the photosynthetic system under high temperature stress,improved the light use efficiency of the Chinese chive's leave,in order to assure the process of nitrate assimilation smooth going.
出处
《中国农学通报》
CSCD
北大核心
2011年第6期133-137,共5页
Chinese Agricultural Science Bulletin
基金
河北省自然科学基金项目"外源水杨酸降低韭菜硝酸盐累积的调控机制研究"(C2009000625)
关键词
水杨酸
高温胁迫
氮代谢
叶绿素荧光
光能吸收利用
salicylic acid
high temperature stress
nitrogenous metabolism
chlorophyll fluorescence
light absorption and utilization
作者简介
霍捷,女,1986年出生,在读硕士,主要从事蔬菜产品质量安全与营养研究。通信地址:071000河北省保定市河北农业大学西校区园艺学院2009级研,Tel:0312—7528325,E—mail:hujie1986@163.com。
通讯作者:高志奎,男,1963年出生,教授,博士生导师,博士,主要从事蔬菜光合生理研究。通信地址:071000河北省保定市河北农业大学西校区园艺学院,Tel:0312—7528332,E-mail:gaozhikui2005@163.com。