Being one of the largest families of transcriptional regulators in plants, WRKY transcription factors (TFs) have been suggested to play significant roles in regulation of various abiotic and biotic stress responses and several developmental and physiological processes. Modification and analyses of its expression patterns contribute to the elaboration of the complex signaling pathways and regulatory networks. Here, we describe the role of a WRKY TF (MdWRKY13) from apple (Malus domestica) in transgenic Arabidopsis thaliana. Overexpression of this gene in Arabidopsis resulted in drought tolerance decrease when compared to wild type plants. This result indicated that MdWRKY13 seems to be a negative regulator in drought stress response.
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