MULTIPASS, a rice R2R3‐typeMYBtranscription factor, regulates adaptive growth by integrating multiple hormonal pathways

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Summary: Growth regulation is an important aspect of plant adaptation during environmental perturbations. Here, the role ofMULTIPASS(OsMPS), an R2R3‐typeMYBtranscription factor of rice, was explored.OsMPSis induced by salt stress and expressed in vegetative and reproductive tissues. Over‐expression ofOsMPSreduces growth under non‐stress conditions, while knockdown plants display increased biomass.OsMPSexpression is induced by abscisic acid and cytokinin, but is repressed by auxin, gibberellin and brassinolide. Growth retardation caused byOsMPSover‐expression is partially restored by auxin application. Expression profiling revealed that OsMPS negatively regulates the expression ofEXPANSIN(EXP) and cell‐wall biosynthesis as well as phytohormone signaling genes. Furthermore, the expression of OsMPS‐dependent genes is regulated by auxin, cytokinin and abscisic acid. Moreover, we show that OsMPS is a direct upstream regulator ofOsEXPA4,OsEXPA8,OsEXPB2,OsEXPB3,OsEXPB6and the endoglucanase genesOsGLU5andOsGLU14. The multiple responses ofOsMPSand its target genes to various hormones suggest an integrative function of OsMPSin the cross‐talk between phytohormones and the environment to regulate adaptive growth.

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