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NACs are one of the largest transcription factor families in plants and are involved in the response to abiotic stress.  BoNAC019 , a homologue of  AtNAC019 , was isolated from cabbage ( Brassica oleracea ). BoNAC019 was localized in the nucleus and functioned as a transcriptional activator. The expression of  BoNAC019  was induced by dehydration, salt, abscisic acid (ABA), and H 2 O 2  treatments.  BoNAC019  overexpressing plants were generated to explore the function of  BoNAC019  in response to drought stress. Overexpression (OE) of  BoNAC019  reduced drought tolerance with lower survival rate, higher water loss rate, lower proline content and ABA content. The seed germination and root length assays of  BoNAC019 -OE plants showed decreased sensitivity to ABA. Under drought condition, antioxidant enzymes and anthocyanin content decreased in  BoNAC019  -OE plants, resulting in the accumulation of more reactive oxygen species (ROS), which cause damage to plants. Several stress-responsive genes, antioxidant enzymatic genes, anthocyanin biosynthetic genes and ABA signaling genes were down-regulated under drought condition while the ABA catabolism genes were induced in  BoNAC019 -OE plants under both normal and drought conditions. Our results demonstrated that  BoNAC019  might participated in regulating drought tolerance by inducing ABA catabolism genes and decreasing ABA content.

scientific reports

Overexpression of BoNAC019, a NAC transcription factor from Brassica oleracea, negatively regulates the dehydration response and anthocyanin biosynthesis in Arabidopsis