Journal
PLANT GROWTH REGULATION
Volume 69, Issue 2, Pages 139-148Publisher
SPRINGER
DOI: 10.1007/s10725-012-9757-4
Keywords
Glucose-6-phosphate dehydrogenase; NAPDH/NADP(+) ratio; NADPH Oxidase; Redox balance; Rice suspension cell; Salt stress
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Funding
- National Natural Science Foundation of China [31170225]
- Major Project of Cultivating New Varieties of Transgenic Organisms [2009ZX08009-029B]
- Project of the National Eleventh-Five Year Research Program of China [2007BAC30B04]
- Doctoral Program of Higher Education of China [20100211110009]
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The reduced coenzyme nicotinamide-adenine dinucleotide phosphate (NADPH) is an important molecule in cellular redox balance. Glucose-6-phosphate dehydrogenase (G6PDH) is a key enzyme in the pentose phosphate pathway, the most important NADPH-generating pathway. In this study, roles of G6PDH in maintaining cell redox balance in rice suspension cells under salt stress were investigated. Results showed that the G6PDH activity decreased in the presence of 80 mM NaCl on day 2. Application of exogenous glucose stimulated the activity of G6PDH and NADPH oxidase under salt stress. Exogenous glucose also increased the ion leakage, thiobarbituric acid reactive substances and hydrogen peroxide (H2O2) contents in the presence of 80 mM NaCl on day 2, implying that the reduction of the G6PDH activity was necessary to avoid serious damage caused by salt stress. The NAPDH/NADP(+) ratio increased on day 2 but decreased on day 4 under 80 mM NaCl plus glucose treatment. Diphenyleneiodonium, an NADPH oxidase inhibitor, decreased the H2O2 content under 80 mM NaCl treatment on day 2. These results imply that the H2O2 accumulation induced by glucose treatment under salt stress on day 2 was related to the NADPH oxidase. Western-blot analysis showed that the G6PDH expression was slightly induced by glucose and was obviously blocked by DPI on day 2 under salt stress. In conclusion, G6PDH plays a key role in maintaining the cell redox balance in rice suspension cells under salt stress. The coordination of G6PDH and NADPH oxidase is required in maintaining cell redox balance in salt tolerance.
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