title: Brassinosteroid-mediated regulation of agronomic traits in rice.
abstract: Brassinosteroids (BRs) are a group of steroid phytohormones with wide-ranging biological activity. Genetic, genomic and proteomic studies have greatly advanced our understanding of BR signaling in Arabidopsis and revealed a connected signal transduction pathway from the cell surface receptor kinase BRASSINOSTEROID-INSENSITIVE1 (BRI1) and BRI1-ASSOCIATED RECEPTOR KINASE 1 (BAK1) to the BRASSINAZOLE-RESISTANT1 (BZR1) family of transcription factors and their targets mediating physiological functions. However, compared with the dicot model plant Arabidopsis, much less is known about BR signaling in rice, which is a monocot. In this review, we provide an update on the progress made by BR studies in rice and discuss how BR regulates various important agronomic traits to determine rice grain yield. Specifically, we discuss the function of novel components including LEAF AND TILLER ANGLE INCREASED CONTROLLER (LIC), DWARF and LOW-TILLERING (DLT), DWARF1 (D1) and TAIHU DWARF1 (TUD1) in rice BR signaling, and provide a rice BR-signaling pathway model that involves a BRI1-dependent pathway as well as a G-protein α subunit-mediated signaling pathway. The recent significant advances in our understanding of BR-mediated molecular mechanisms underlying agronomic traits will be of great help for rice molecular breeding.
authors.affiliation: Institute of Genetics and Development Biology, Chinese Academy of Sciences, Beijing, 100101, China.
authors.forename: Cui
authors.initials: C
authors.lastname: Zhang
authors.forename: Ming-Yi
authors.initials: MY
authors.lastname: Bai
authors.forename: Kang
authors.initials: K
authors.lastname: Chong
mesh_terms: D017360:Arabidopsis / Q000235:genetics / Q000502:physiology; D018533:Biomass; D060406:Brassinosteroids / Q000378:metabolism*; D018556:Crops, Agricultural; D002523:Edible Grain / Q000235:genetics / Q000502:physiology; D019204:GTP-Binding Proteins / Q000235:genetics / Q000378:metabolism; D018506:Gene Expression Regulation, Plant; D005838:Genotype; D006706:Homeostasis; D012275:Oryza / Q000235:genetics / Q000502:physiology*; D010641:Phenotype; D010937:Plant Growth Regulators / Q000378:metabolism*; D018515:Plant Leaves / Q000235:genetics / Q000502:physiology; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism; D030821:Plants, Genetically Modified; D015398:Signal Transduction; D013312:Stress, Physiological
chemical_list: D060406:Brassinosteroids; D010937:Plant Growth Regulators; D010940:Plant Proteins; D019204:GTP-Binding Proteins