Os06g0226500

The rice Os06g0226500 was reported as BU1 in 2009 by researchers from Japan.

Annotated Information

Gene Symbol

• Os06g0226500 <=> ILI4, OsBU1

Function

• Brassinosteroids (BRs) are involved in many developmental processes and regulate many subsets of downstream genes throughout the plant kingdom.
• The rice BRASSINOSTEROID UPREGULATED1 (BU1) is a novel BR-induced gene encoding a helix-loop-helix protein.
• BU1 protein is a positive regulator of BR response: it controls bending of the lamina joint in rice and it is a novel primary response gene that participates in two BR signaling pathways through OsBRI1 and RGA1.
• BU1 may participate in some other unknown processes modulated by BR in rice.

Phenotypic analysis

• Rice plants overexpressing BU1(BU1:OX) showed enhanced bending of the lamina joint, increased grain size, and resistance to brassinazole, an inhibitor of BR biosynthesis.
• In contrast to BU1:OX, RNAi plants designed to repress both BU1 and its homologs displayed erect leaves.
• In addition, compared to the wild type, the induction of BU1 by exogenous brassinolide did not require de novo protein synthesis and it was weaker in a BR receptor mutant OsbriI (Oryza sativa brassinosteroid insensitive1, d61) and a rice G protein alpha subunit (RGA1) mutant d1.

Expression

• Expression analyses showed that BU1 is expressed in several organs including lamina joint, phloem, and epithelial cells in embryos.

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Labs working on this gene

• Disease Resistance Research Unit (A.T., H.N., C.T., M.O., C.-J.J., J.G.D., M.M.) and Plant Genome Research Unit (S.K.), National Institute of Agrobiological Sciences, Tsukuba 305–8602, Japan;
• Graduate School of Science and Technology, Tokyo University of Science, Noda 278–8510, Japan (A.T., T.K.);
• Institute of Society for Techno-Innovation of Agriculture, Forestry and Fisheries, Tsukuba 305–0854, Japan (Z.S.); Faculty of Agriculture, Utsunomiya University, Utsunomiya 321–8505, Japan (C.T., H.S.);
• Department of Bioscience, Teikyo University, Utsunomiya 320–8551, Japan (T.N., T.Y.); a
• Department of Applied Biological Chemistry, University of Tokyo, Tokyo 113–8657, Japan (T.A.)