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Pathogen-induced MdWRKY1 in ‘Qinguan’ Apple Enhances Disease Resistance
Hongke Fan,Fei Wang,Hua Gao,Leicun Wang,Jihua Xu,Zhengyang Zhao 한국식물학회 2011 Journal of Plant Biology Vol.54 No.3
The WRKY transcription factors have important functions in plant-defense signalling networks. We isolated MdWRKY1 from the Chinese ‘Qinguan’ apple, which is resistant to Alternaria blotch or leaf spot. The MdWRKY1protein was targeted to the nucleus and activated the expression of a reporter gene, consistent with the functioning of a transcription factor. When plants were infected with the pathogen Alternaria alternata f. sp. mali, MdWRKY1 was induced dramatically. Similarly, treatment with hormones SA and MeJA increased transcription significantly. Overexpression in tobacco also enhanced resistance to Phytophthora parasitica var. nicotianae Tucker. These results suggest that MdWRKY1 is a positive regulator of the defense response in higher plants.