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KMID : 0368420150580050327
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Journal of Plant Biology
2015 Volume.58 No. 5 p.327 ~ p.332
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Down-regulation of rice serpin gene OsSRP-LRS exaggerates stress-induced cell death
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Bhattacharjee Lipika
Singh Praveen Kumar
Singh Subaran
Nandi Ashis Kumar
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Abstract
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Serine protease inhibitors (serpins) and their cognate proteases control diverse physiological processes, including program cell death and immune response, in insects and mammals. Arabidopsis AtSerpin1 inhibits pro-cell-death proteases and protects cells from excessive cell death induced by pathogens. The rice genome contains at least 14 serpin coding genes, but a biological role is not known for any of them. We show here that expression of rice serpin1 (OsSRP-LRS; the closest homolog of AtSerpin1 in rice) is induced by necrotrophic fungal pathogen Rhizoctonia solani inoculation, UV and salt treatment. The transgenic RNAi lines having reduced expression of OsSRP-LRS are morphologically unaffected under the stress-free condition, but show exaggerated cell death upon pathogen, UV or salt treatment. Our results suggest that OsSRP-LRS negatively regulates stress-induced cell death in rice.
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KEYWORD
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Cell-death, Rhizoctonia solani, Rice, RNAi, Salt, Serpin, UV
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