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Transcriptional expression of signaling and transcription factor genes in leaf and root under drought stress. RNA was extracted from 10-day stressed leaves and roots and reverse-transcribed to synthesize cDNA, which was used for qPCR analysis with primers specific for four genes AREB (A), NAC1 (B), DREB2 (C), and CDPK2 (D). Data represented means ± SE of three biological replicates. Bar indicates SE. **t-test, with P < 0.01; *t-test, with P < 0.05.
