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Acta Agron Sin ›› 2016, Vol. 42 ›› Issue (04): 574-582.doi: 10.3724/SP.J.1006.2016.00574

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Characteristics of Photosynthesis and Antioxidation in Rice Photo-oxidation Mutant 812HS

XU Jin-Gang1,LÜ Chuan-Gen2,*,LIU Li1,LÜ Chun-Fang1,MA Jing1,XIA Shi-Jian2,CHEN Guo-Xiang1,GAO Zhi-Ping1,*   

  1. 1 College of Life Sciences, Nanjing Normal University, Nanjing 210023, China; 2 Institute of Food Crops, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
  • Received:2015-08-21 Revised:2016-01-11 Online:2016-04-12 Published:2016-01-27
  • Contact: 吕川根, E-mail: lvchuangen@sina.com; 高志萍, E-mail: 08295@njnu.edu.cn E-mail:jingang_0317@163.com
  • Supported by:

    The study was supported by the National Natural Science Foundation of China (31271621), Natural Science Research of Jiangsu Higher Education Institutions (14KJB180011), the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), Natural Science Foundation of Jiangsu Province (BK20140916), and Jiangsu Collaborative Innovation Center for Modern Crop Production.

Abstract:

To reveal the physiological mechanism of leaf photo-oxidation in a rice mutant 812HS, we compared and analyzed differences of photochemical activity, antioxidative enzyme activities between 812HS and its wild type 812S grown in the field.  Results showed that chlorophyll content, PSII activity, photophosphorylation activity, net photosynthetic rate (Pn) and antioxidative enzymes activities as well as active oxygen contents in 812HS were similar to those in 812S before exposed to high intensity of sunlight. However, all above indexes were affected by a period of high intensity of sunlight. The decreased degree of chlorophyll content, PSII activity, non-cyclic photophosphorylation (NCPS) activity and Pn in 812HS were significantly higher than those in 812S. Besides, high intensity of sunlight led to a lower increase rate of POD and CAT activities in 812HS. Therefore, the contents of O2?, H2O2, and MDA in 812HS became higher than those in 812S. The result implied that the leaf photo-oxidation of mutant 812HS mainly results from higher sensitivity of PSII activities and lower CAT, POD activities under high intensity of sunlight.

Key words: Photo-oxidation, Photochemical activity, Antioxidative enzyme activity

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