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Acta Agron Sin ›› 2008, Vol. 34 ›› Issue (05): 823-830.doi: 10.3724/SP.J.1006.2008.00823

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

Effect of AsA-GSH Cycle on Hg2+-Tolerance in Rice Mutant

ZENG Bin1,WANG Fei-Juan1,ZHU Cheng1*,SUN Zong-Xiu2   

  1. 1 State Key Laboratory of Plant Physiology & Biochemistry, College of Life Science, Zhejiang University, Hangzhou 310058, Zhejiang; 2 State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou 310006, Zhejiang, China
  • Received:2007-09-23 Revised:1900-01-01 Online:2008-05-12 Published:2008-05-12
  • Contact: ZHU Cheng

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Abstract: Mercury (Hg) toxicity is an in rice growth problem throughout the world. In the present study, Zhonghua 11 and a Hg2+-tolerant rice mutant (MT) were used in a solution culture to investigate the effect of 0.4 mmol L-1 Hg2+ treatment on reactive
oxygen species (ROS) metabolism and dynamic change of ascorbate-glutathione (AsA-GSH) cycle. The results indicated that the
H2O2 content, evolution rate, MDA content, GSSG and DHAcontents of the leaves were higher in the wild type than in the
mutant; both the ratio of GSH to GSSG and the ratio of AsA to DHA were higher in the mutant than in the wild type, while the accumulation of Hg2+ in roots and stems of the mutant was more than that of the wild type. The results reveal that AsA-GSH cycle was less inhibited in the mutant than in the wild type, thus the mutant was able to scavenge ROS more. An effective AsA-GSH cycle is important for the mercury resistance of mutant.

Key words: Hg2+, Rice, Mutant, Reactive oxygen species, AsA-GSH cycle

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