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Abstract
The plant-specific NAC (NAM, ATAF1/2, CUC2) transcription factors play diverse roles
in plant development and stress responses. In this study, a rice NAC gene, ONAC045,
was functionally characterized, especially with regard to its role in abiotic stress
resistance. Expression analysis revealed that ONAC045 was induced by drought, high
salt, and low temperature stresses, and abscisic acid (ABA) treatment in leaves and
roots. Transcriptional activation assay in yeast indicated that ONAC045 functioned
as a transcriptional activator. Transient expression of GFP-ONAC045 in onion epidermal
cells revealed that ONAC045 protein was localized in the nucleus. Transgenic rice
plants overexpressing ONAC045 showed enhanced tolerance to drought and salt treatments.
Two stress-responsive genes were upregulated in transgenic rice. Together, these results
suggest that ONAC045 encodes a novel stress-responsive NAC transcription factor and
is potential useful for engineering drought and salt tolerant rice.