Abstract

It is well known that plant growth, development, and response to environmental stresses are harmonized through the action of a suite of growth and defense signaling molecules. Brassinosteroid (BR) is a steroid hormone that regulates plant growth and development. BR binds to and activates the BR-INSENSITIVE 1 (BRI1)/BRI1-ASSOCIATED KINASE 1 receptor kinase complex on the cell surface to phosphorylate the intracellular receptor-like cytoplasmic kinases BR SIGNALING KINASE 1 and CONSTITUTIVE DIFFERENTIAL GROWTH 1, which in turn phosphorylate the phosphatase BRI1 SUPPRESSOR 1.

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