期刊
ACTA PHYSIOLOGIAE PLANTARUM
卷 35, 期 3, 页码 891-900出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11738-012-1132-6
关键词
Antioxidant enzymes; Cross-adaptation; Hydrogen peroxide; Rice; Salt stress
资金
- National Natural Science Foundation of China [31170225, 31201145]
- National High Technology Research and Development Program [2007AA021401]
- Foundation of Science and Technology Program of Gansu Province [1107RJYA005]
- Fundamental Research Funds for the Central Universities [lzujbky-2012-104]
- Chunhuijihua Foundation [Z2008-1-62015]
In the present study, we investigated the salt tolerance mechanism of two rice cultivars (Zhenghan-2 and Yujing-6), which show different tolerance to drought and disease. NaCl induced higher extent of lipid peroxide and ion leakage in Yujing-6 roots than those in Zhenghan-2 roots. H2O2 accumulation in Zhenghan-2 roots was lower than that in Yujing-6 roots under salt stress. Comparatively, NaCl treatment did not increase O-2 (-) contents in both rice roots, however, O-2 (-) level in Yujing-6 roots was higher than that in Zhenghan-2 roots under both control and salt stress conditions. Ascorbate peroxidases (APX) activity increased more significantly in Zhenghan-2 roots than that in Yujing-6 roots. The activity of catalase (CAT), peroxidase (POD), superoxide dismutase (SOD), and glucose-6-phosphate dehydrogenase (G6PDH) was similarly enhanced in both rice roots under salt stress; however, they showed higher levels in Zhenghan-2 roots than in Yujing-6 roots. Exogenous H2O2 could enhance APX, CAT, POD, SOD and G6PDH activities in a concentration-dependent manner in both rice roots. Diphenylene iodonium (DPI), a plasma membrane (PM) NADPH oxidase inhibitor, which counteracted the NaCl-induced H2O2 accumulation, markedly decreased the activity of above enzymes. Moreover, ion leakage increased dramatically in Zhenghan-2 roots and reached to the similar level of Yujing-6 roots under NaCl+DPI treatment. Taken together, H2O2, which is mainly generated from PM NADPH oxidase, is involved in Zhenghan-2 rice tolerance to salt stress by enhancing the cellular antioxidant level.
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