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The OsbZIP23 transcription factor,a close homolog of Arabidopsis ABI5,has been characterized for its essential role in drought resistance in rice,but the regulatory mechanism is unknown.We first investigated the transcriptional activation of OsbZIP23.A homolog of SnRK2 protein kinase SAPK2 was found to interact with and phosphorylate OsbZIP23 for its transcriptional activation.