摘要
The gaseous pollutant SO_2 impacts deleteriously on crop growth and development. To identify genes required for SO_2 stress response in maize(Zea mays. L), one highly induced m RNA encoding a D1 protein of photosystem II(ZmpsbA) was isolated by mRNA differential display. Real-time PCR analysis indicated that the transcript levels of ZmpsbA were higher in leaves and were markedly up-regulated by SO_2 stress. Overexpression of ZmpsbA enhanced SO_2 stress tolerance in tobacco; showing much less damage upon SO_2 exposure. The transgenic tobacco lines had higher proline accumulation, but lower levels of malondialdehyde(MDA) when compared with the wild-type plants under SO_2 stress. Further investigation showed that ZmpsbA transgenic plants displayed higher SOD and CAT activities, increased SOD and CAT transcript levels, and decreased reactive oxygen species(ROS) accumulation under SO_2 stress. Taken together, our results demonstrate that ZmpsbA confers SO_2 stress tolerance in transgenic tobacco by reducing ROS accumulation and membrane damage through enhancing the antioxidant system. ZmpsbA might serve as a candidate gene in genetic improvement for environmental pollutants(SO_2 and acid rain, etc) tolerance engineering in crop plants.
The gaseous pollutant SO_2 impacts deleteriously on crop growth and development. To identify genes required for SO_2 stress response in maize(Zea mays. L), one highly induced m RNA encoding a D1 protein of photosystem II(ZmpsbA) was isolated by mRNA differential display. Real-time PCR analysis indicated that the transcript levels of ZmpsbA were higher in leaves and were markedly up-regulated by SO_2 stress. Overexpression of ZmpsbA enhanced SO_2 stress tolerance in tobacco; showing much less damage upon SO_2 exposure. The transgenic tobacco lines had higher proline accumulation, but lower levels of malondialdehyde(MDA) when compared with the wild-type plants under SO_2 stress. Further investigation showed that ZmpsbA transgenic plants displayed higher SOD and CAT activities, increased SOD and CAT transcript levels, and decreased reactive oxygen species(ROS) accumulation under SO_2 stress. Taken together, our results demonstrate that ZmpsbA confers SO_2 stress tolerance in transgenic tobacco by reducing ROS accumulation and membrane damage through enhancing the antioxidant system. ZmpsbA might serve as a candidate gene in genetic improvement for environmental pollutants(SO_2 and acid rain, etc) tolerance engineering in crop plants.
引文
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