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NAC (NAM, ATAF1/2, and CUC2) proteins play critical roles in many plant biological processes and environmental stress. However, NAC proteins from  Tamarix hispida  have not been functionally characterized. Here, we studied a  NAC  gene from  T .  hispida, ThNAC13 , in response to salt and osmotic stresses. ThNAC13 is a nuclear protein with a C-terminal transactivation domain. ThNAC13 can bind to NAC recognized sites and calmodulin-binding NAC (CBNAC) binding element. Overexpression of  ThNAC13  in  Arabidopsis  improved seed germination rate and increased root growth and fresh weight gain under salt or osmotic stress. Transgenic  T .  hispida  plants transiently overexpressing  ThNAC13  and with RNAi-silenced  ThNAC13  were generated for gain- and loss-of-function experiments. Following exposure to salt or osmotic stress, overexpression of  ThNAC13  induced superoxide dismutase (SOD) and peroxidase (POD) activities, chlorophyll and proline contents; decreased the reactive oxygen species (ROS) and malondialdehyde levels; and reduced electrolyte leakage rates in both transgenic  Tamarix  and  Arabidopsis  plants. In contrast, RNAi-silenced  ThNAC13  showed the opposite results in transgenic  Tamarix . Furthermore,  ThNAC13  induced the expression of  SOD s and  POD s in transgenic  Arabidopsis . These results suggest that ThNAC13 improves salt and osmotic tolerance by enhancing the ROS-scavenging capability and adjusting osmotic potential.

ThNAC13, a NAC Transcription Factor from Tamarix hispida, Confers Salt and Osmotic Stress Tolerance to Transgenic Tamarix and Arabidopsis