Differential Expressions of Two Cytosolic Ascorbate Peroxidase and Two Superoxide Dismutase Genes in Response to Abiotic Stress in Rice

摘要/Abstract

摘要： Superoxide dismutase (SOD) and ascorbate peroxidase (APX) play central roles in the pathway for scavenging reactive oxygen species in plants, thereby contributing to the tolerance against abiotic stress. Here we report the responses of cytosolic SOD (cSOD; sodCc1 and sodCc2) and cytosolic APX (cAPX; OsAPX1 and OsAPX2) genes to oxidative and abiotic stress in rice. RNA blot analyses revealed that methyl viologen treatment caused a more prominent induction of cAPXs compared with cSODs, and hydrogen peroxide treatment induced the expression of cAPXs whereas cSODs were not affected. These results suggest that cAPXs play more important roles in defense against oxidative stress compared with cSODs. It is noted that cSODs and cAPXs showed coordinate response to abscisic acid treatment which induced both sodCc1 and OsAPX2. However, cSODs and cAPXs responded differentially to drought, salt and chilling stress, which indicates that cSOD and cAPX genes are expressed differentially in response to oxidative and abiotic stress in rice.

关键词: ascorbate peroxidase, superoxide dismutase, reactive oxygen species, abiotic stress

Shigeto MORITA, Shinya NAKATANI, Tomokazu KOSHIBA, Takehiro MASUMURA, Yasunari OGIHARA, Kunisuke TANAKA. Differential Expressions of Two Cytosolic Ascorbate Peroxidase and Two Superoxide Dismutase Genes in Response to Abiotic Stress in Rice[J]. RICE SCIENCE.

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