Abstract
WRKY transcription factors (TFs) play important roles in many plant processes, including responses to biotic and abiotic stresses. In the present study, Muscadinia rotundifolia MrWRKY30 dramatically accumulated in grapevine leaves in response to inoculation of Plasmopara viticola, a pathogen causing grapevine downy mildew disease. Similar responses were also found on grapevines treated with exogenous SA/JA/ET. Ectopic expression of MrWRKY30 in Arabidopsis thaliana “COL0” enhanced its resistance to downy mildew pathogen Peronospora parasitica. Pathogenesis-related (PR) genes, including AtPR1, AtPR4, AtPR5, and AtPDF1.2, were significantly upregulated in transgenic A. thaliana after P. parasitica inoculation. In the mean time, two critical genes in SA and JA signaling pathways, AtEDS5 and AtJAR1, were abundantly expressed as well, indicating that MrWRKY30 may enhance disease resistance of A. thaliana through SA and JA defense system. The transgenic A. thaliana plants also enhanced tolerance to cold stress accompanied with upregulation of AtCBF1, AtCBF3, AtICE1, and AtCOR47. MrWRKY30 might protect A. thaliana from cold damage by activating the AtCBF-mediated signaling pathway to induce the downstream AtCOR47 gene. Interestingly, the transgenic seedlings had a negative effect on salt tolerance. Reverse transcription PCR (RT-PCR) analysis revealed that antioxidant enzyme genes AtAPX (ascorbate peroxidase), AtCAT (catalase), and AtGST (glutathione-S-transferase) were suppressed in transgenic plants, which may lead to reactive oxygen species (ROS)-mediated sensitivity to salt stress.
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This work was supported by the Chinese Universities Scientific Fund (Grant No. 2012RC019) and earmarked fund for Modern Agro-industry Technology Research System (CARS-30-yz-2).
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Handling Editor: Hanns H. Kassemeyer
Wenming Jiang and Jiao Wu contributed equally to this work.
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Jiang, W., Wu, J., Zhang, Y. et al. Isolation of a WRKY30 gene from Muscadinia rotundifolia (Michx) and validation of its function under biotic and abiotic stresses. Protoplasma 252, 1361–1374 (2015). https://doi.org/10.1007/s00709-015-0769-6
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DOI: https://doi.org/10.1007/s00709-015-0769-6