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《Acta Botanica Boreali-Occidentalia Sinica》 2010-02
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Effects of Exogenous Proline on the Ascorbat-glutahione Cycle and Photosynthetic Fluorescence Characteristics in Leaves of Cucumber Seedlings under High Temperature Stress

LIU Shu-ren,GUO Shi-rong*,CHENG Yu-jing,LIU Chao-jie,WANG Li-ping,SHU Sheng(College of Horticulture,Nanjing Agricultural University/Key Laboratory of Southern Vegetable Crop Genetic Improvement,Ministry of Agriculture,Nanjing 210095,China)  
The experiment was carried out by cucumber cultivar 'Xintai Mici' with weak heat resistance in climate chambers and hydroponics to investigate the negative effects of high temperature on AsA-GSH cycle and photosynthetic fluorescence characteristics of seedling leaves and the positive effects of exogenous proline pretreatment.The results showed that:(1)compared with the water treatment,under high temperature stress(treat 4 h,8 h).The activities of MDAR,the ratio of GSH/GSSG,and the content of GSH in leaves of cucumber seedlings were significantly increased in proline pretreatment.(2)Under high temperature stress(treat 8 h),proline pretreatment significantly increased Pn,Gs,Fv/Fm and qP in leaves of cucumber seedlings,but Tr and NPQ decreased.The results indicated that exogenous praline pretreatment significantly enhanced scavenging activity on H2O2 of AsA-GSH cycle and photosynthetic capacity in leaves of cucumber seedlings,and efficiently alleviated the injury of cucumber seedlings to antioxidant system and photosynthetic system under high temperature stress.Therefore,exogenous proline could enhance heat resistance of cucumber seedlings to high temperature stress.
【Fund】: 国家973计划(2009CB119000);; 现代农业产业技术体系建设专项资金;; 国家科技支撑计划(2008BADA6B00);; 江苏省农业三项工程项目[SX(2008)026]
【CateGory Index】: S642.2
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