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The MYB transcription factors (TFs) is a plant TF families, which involves in hormone signal transduction, and abiotic stress tolerance, etc. However, there are few studies on the MYB TFs family and its regulatory mechanism in  Tamarix hispida . In this study, 14  MYB  genes (named  ThMYB1 - ThMYB14 ) were cloned and characterized from  T. hispida . The transcription profiles of  ThMYBs  in  T. hispida  under different abiotic stress conditions were monitored using qRT-PCR. Most of studied  ThMYBs  were significantly downregulated and/or upregulated by salt and osmotic stress, ABA, GA3 and JA treatments in at least one organ. Especially,  ThMYB13  was induced in the leaves and roots of  T. hispida  when exposed to NaCl treatment at all study periods, indicating that it may involve in salt stress. To further study  ThMYB1 3 function,  ThMYB1 3 overexpression and knock-down plants and control plants transformed with an empty pROKII were obtained using a transient transformation system. Overexpression of  ThMYB1 3 in  T. hispida  displayed the lowest O 2- , H 2 O 2  and MDA accumulation, minimal cell death, the most stable K + /Na +  ratio and the lowest electrolyte leakage rate among the three kinds of transient expression in  T. hispida . Conversely, the RNAi-silencing, transiently transformed plants displayed the opposite physiological changes. Therefore,  ThMYB1 3 might play a role in salt stress tolerance in transgenic  T. hispida  plants.

Comprehensive Analysis of MYB Gene Family and Their Expressions Under Abiotic Stresses and Hormone Treatments in Tamarix hispida