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GRAS transcription factors play important roles in plant abiotic stress response, but their characteristics and functions in cotton have not been fully investigated. A cotton SCL4/7 subgroup gene in the GRAS family,  GhSCL4 , was found to be induced by NaCl treatments. Nuclear localization and transactivation activity of  GhSCL4  indicate its potential role in transcriptional regulation. Transgenic  Arabidopsis thaliana  over-expressing  GhSCL4  showed enhanced resistance to salt and osmotic stress. What’s more, the transcript levels of salt stress-induced genes ( AtNHX1  and  AtSOS1 ) and oxidation-related genes ( AtAPX3  and  AtCSD2 ) were more highly induced in the  GhSCL4  over-expression lines than in wild type after salt treatment. Furthermore, silencing of  GhSCL4  resulted in reduced salt tolerance in cotton caused by reactive oxygen species (ROS) enrichment under salt treatment, and antioxidant enzyme activities were accordingly significantly reduced in  GhSLC4 -silenced lines. These results indicated that  GhSCL4  enhances salt tolerance of cotton by detoxifying ROS. In addition, the transient expression assay confirmed an interactive relationship between GhSCL4 and GhCaM7, which indicated that salt tolerance conferred by  GhSCL4  might be associated with salt-induced Ca 2+ /CaM7-mediated signaling. Taken together,  GhSCL4  acts as a positive regulator in cotton during salt stress that is potentially useful for engineering salt-tolerant cotton.

GhSCL4 Acts as a Positive Regulator in Both Transgenic Arabidopsis and Cotton during Salt Stress