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Molecular Biology Reports 2012-Aug

Overexpressing MhNPR1 in transgenic Fuji apples enhances resistance to apple powdery mildew.

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Xiu-Kong Chen
Ji-Yu Zhang
Zhen Zhang
Xiao-Li Du
Bei-Bei Du
Shen-Chun Qu

Nøgleord

Abstrakt

Fuji is susceptible to fungal diseases like apple powdery mildew. Non-expressor of pathogenesis-related gene 1 (NPR1) plays a key role in regulating salicylic acid (SA)-mediated systemic acquired resistance (SAR). Previous studies show that overexpressing the Malus hupehensis-derived NPR1 (MhNPR1) gene in tobacco induces the transcript expression of pathogenesis-related genes (PRs) and resistance to the fungus Botrytis cinerea. In this study we introduced the MhNPR1 gene into the 'Fuji' apple via Agrobacterium-mediated transformation. Four transgenic apple lines were verified by PCR and RT-PCR. The semi-quantitative RT-PCR results showed that transcript overexpression of the MhNPR1 gene induced the expression of MdPRs and MdMLO genes known to interact with powdery mildew. Furthermore, the transgenic apple plants resisted infection by apple powdery mildew better than the wild-type plants. As a result, transcript overexpression of the MhNPR1 gene induced SAR and enhanced the Fuji apple's resistance to fungal disease.

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