title: A mutation in Arabidopsis BSK5 encoding a brassinosteroid-signaling kinase protein affects responses to salinity and abscisic acid.
abstract: As the most recently characterized group of plant hormones, brassinosteroids (BR) are involved in a number of physiological responses. Although many key components of the BR signaling pathway have been isolated and characterized, there is little information on detailed characterization of brassinosteroid-signaling kinase (BSK) proteins. In this study, Arabidopsis BSK5 was isolated and functionally analyzed. BSK5 transcripts were detected in various tissues, and were induced by abiotic stresses including salt and drought, as well as phytohormones of BR and abscisic acid (ABA). Arabidopsis loss-of-function mutant bsk5 exhibited sensitivity to salinity and ABA. Mutations of the BSK5 gene also altered the expression of several stress-regulated genes. We suggest that BSK5 responds to other signals as well as BR.
authors.affiliation: Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS)/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of Agriculture, Beijing 100081, China.
authors.forename: Zhi-Yong
authors.initials: ZY
authors.lastname: Li
authors.forename: Zhao-Shi
authors.initials: ZS
authors.lastname: Xu
authors.forename: Guang-Yuan
authors.initials: GY
authors.lastname: He
authors.forename: Guang-Xiao
authors.initials: GX
authors.lastname: Yang
authors.forename: Ming
authors.initials: M
authors.lastname: Chen
authors.forename: Lian-Cheng
authors.initials: LC
authors.lastname: Li
authors.forename: You-Zhi
authors.initials: YZ
authors.lastname: Ma
mesh_terms: D000040:Abscisic Acid / Q000494:pharmacology / Q000502:physiology*; D017360:Arabidopsis / Q000187:drug effects / Q000235:genetics* / Q000502:physiology*; D029681:Arabidopsis Proteins / Q000235:genetics / Q000502:physiology*; D060406:Brassinosteroids / Q000378:metabolism; D018506:Gene Expression Regulation, Plant; D009154:Mutation; D011494:Protein Kinases / Q000235:genetics / Q000502:physiology*; D054712:Salinity; D013312:Stress, Physiological / Q000235:genetics / Q000502:physiology*
chemical_list: D029681:Arabidopsis Proteins; D060406:Brassinosteroids; D000040:Abscisic Acid; C578204:BSK5 protein, Arabidopsis; D011494:Protein Kinases