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REVEILLE  ( RVE ) genes generally act as core circadian oscillators to regulate multiple developmental events and stress responses in plants. It is of importance to document their roles in crops for utilizing them to improve agronomic traits. Soybean is one of the most important crops worldwide. However, the knowledge regarding the functional roles of  RVE s is extremely limited in soybean. In this study, the soybean gene  GmMYB133  was shown to be homologous to the  RVE8  clade genes of  Arabidopsis .  GmMYB133  displayed a non-rhythmical but salt-inducible expression pattern. Like  AtRVE8 , overexpression of  GmMYB133  in  Arabidopsis  led to developmental defects such as short hypocotyl and late flowering. Seven light-responsive or auxin-associated genes including  AtPIF4  were transcriptionally depressed by  GmMYB133 , suggesting that  GmMYB133  might negatively regulate plant growth. Noticeably, the overexpression of  GmMYB133  in  Arabidopsis  promoted seed germination and plant growth under salt stress, and the contents of chlorophylls and malondialdehyde (MDA) were also enhanced and decreased, respectively. Consistently, the expressions of four positive regulators responsive to salt tolerance were remarkably elevated by  GmMYB133  overexpression, indicating that  GmMYB133  might confer salt stress tolerance. Further observation showed that  GmMYB133  overexpression perturbed the clock rhythm of  AtPRR5 , and yeast one-hybrid assay indicated that GmMYB133 could bind to the  AtPRR5  promoter. Moreover, the retrieved ChIP-Seq data showed that AtPRR5 could directly target five clients including  AtPIF4 . Thus, a regulatory module  GmMYB133-PRR5-PIF4  was proposed to regulate plant growth and salt stress tolerance. These findings laid a foundation to further address the functional roles of  GmMYB133  and its regulatory mechanisms in soybean.

Soybean GmMYB133 Inhibits Hypocotyl Elongation and Confers Salt Tolerance in Arabidopsis