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The NAC proteins form one of the largest families of plant-specific transcription factors (TFs) and play essential roles in developmental processes and stress responses. In this study, we characterized a NAC domain transcription factor,  OoNAC72 , from a legume  Oxytropis ochrocephala . OoNAC72 was proved to be localized in the nuclei in tobacco lower epidermal cells and had transcriptional activation activity in yeast, confirming its transcription activity.  OoNAC72  expression could be induced by drought, salinity and exogenous abscisic acid (ABA) in  O. ochrocephala  seedlings. Furthermore, over-expression of  OoNAC72  driven by CaMV35S promoter in  Arabidopsis  resulted in ABA hypersensitivity and enhanced tolerance to drought and salt stresses during seed germination and post-germinative growth periods. In addition, over-expression of  OoNAC72  enhanced the expression of stress-responsive genes such as  RD29A ,  RD29B ,  RD26 ,  LEA14 ,  ANACOR19 ,  ZAT10 ,  PP2CA , and  NCED3 . These results highlight the important regulatory role of  OoNAC72  in multiple abiotic stress tolerance, and may provide an underlying reason for the spread of  O. ochrocephala .

OoNAC72, a NAC-Type Oxytropis ochrocephala Transcription Factor, Conferring Enhanced Drought and Salt Stress Tolerance in Arabidopsis