title: Genome-wide identification, phylogeny, duplication, and expression analyses of two-component system genes in Chinese cabbage (Brassica rapa ssp. pekinensis).
abstract: In plants, a two component system (TCS) composed of sensor histidine kinases (HKs), histidine phosphotransfer proteins (HPs), and response regulators (RRs) has been employed in cytokinin signal transduction. A TCS exhibits important functions in diverse biological processes, including plant growth, development, and response to environmental stimuli. Conducting an exhaustive search of the Chinese cabbage genome, a total of 20 HK(L) (11 HKs and 9 HKLs), 8 HP (7 authentic and 1 pseudo), and 57 RR (21 Type-A, 17 Type-B, 4 Type-C, and 15 pseudo) proteins were identified. The structures, conserved domains, and phylogenetic relationships of these protein-coding genes were analysed in detail. The duplications, evolutionary patterns, and divergence of the TCS genes were investigated. The transcription levels of TCS genes in various tissues, organs, and developmental stages were further analysed to obtain information of the functions of these genes. Cytokinin-related binding elements were found in the putative promoter regions of Type-A BrRR genes. Furthermore, gene expression patterns to adverse environmental stresses (drought and high salinity) and exogenous phytohormones (tZ and ABA) were investigated. Numerous stress-responsive candidate genes were obtained. Our systematic analyses provided insights into the characterization of the TCS genes in Chinese cabbage and basis for further functional studies of such genes.
authors.affiliation: Laboratory of Cell and Molecular Biology, Institute of Vegetable Science, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, PR China Laboratory of Horticultural Plant Growth and Quality Regulation, Ministry of Agriculture, Hangzhou 310058, PR China.
authors.forename: Zhenning
authors.initials: Z
authors.lastname: Liu
authors.affiliation: Laboratory of Cell and Molecular Biology, Institute of Vegetable Science, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, PR China Laboratory of Horticultural Plant Growth and Quality Regulation, Ministry of Agriculture, Hangzhou 310058, PR China.
authors.forename: Mei
authors.initials: M
authors.lastname: Zhang
authors.affiliation: Laboratory of Cell and Molecular Biology, Institute of Vegetable Science, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, PR China Laboratory of Horticultural Plant Growth and Quality Regulation, Ministry of Agriculture, Hangzhou 310058, PR China.
authors.forename: Lijun
authors.initials: L
authors.lastname: Kong
authors.affiliation: Laboratory of Cell and Molecular Biology, Institute of Vegetable Science, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, PR China Laboratory of Horticultural Plant Growth and Quality Regulation, Ministry of Agriculture, Hangzhou 310058, PR China.
authors.forename: Yanxia
authors.initials: Y
authors.lastname: Lv
authors.affiliation: Laboratory of Cell and Molecular Biology, Institute of Vegetable Science, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, PR China Laboratory of Horticultural Plant Growth and Quality Regulation, Ministry of Agriculture, Hangzhou 310058, PR China.
authors.forename: Minghua
authors.initials: M
authors.lastname: Zou
authors.affiliation: Laboratory of Cell and Molecular Biology, Institute of Vegetable Science, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, PR China Laboratory of Horticultural Plant Growth and Quality Regulation, Ministry of Agriculture, Hangzhou 310058, PR China.
authors.forename: Gang
authors.initials: G
authors.lastname: Lu
authors.affiliation: Laboratory of Cell and Molecular Biology, Institute of Vegetable Science, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, PR China Laboratory of Horticultural Plant Growth and Quality Regulation, Ministry of Agriculture, Hangzhou 310058, PR China.
authors.forename: Jiashu
authors.initials: J
authors.lastname: Cao
authors.affiliation: Laboratory of Cell and Molecular Biology, Institute of Vegetable Science, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, PR China Laboratory of Horticultural Plant Growth and Quality Regulation, Ministry of Agriculture, Hangzhou 310058, PR China xlyu@zju.edu.cn.
authors.forename: Xiaolin
authors.initials: X
authors.lastname: Yu
mesh_terms: D017360:Arabidopsis / Q000235:genetics; D029741:Brassica rapa / Q000235:genetics* / Q000254:growth & development / Q000378:metabolism; D032461:Chromosomes, Plant; D055864:Droughts; D019143:Evolution, Molecular; D020440:Gene Duplication; D020869:Gene Expression Profiling; D018745:Genome, Plant; D000071677:Histidine Kinase; D058977:Molecular Sequence Annotation; D010802:Phylogeny; D010937:Plant Growth Regulators / Q000235:genetics; D018515:Plant Leaves / Q000378:metabolism; D010940:Plant Proteins / Q000235:genetics*; D018517:Plant Roots / Q000378:metabolism; D011401:Promoter Regions, Genetic; D011494:Protein Kinases / Q000235:genetics; D054712:Salinity; D013312:Stress, Physiological / Q000235:genetics
chemical_list: D010937:Plant Growth Regulators; D010940:Plant Proteins; D011494:Protein Kinases; D000071677:Histidine Kinase
keywords: Chinese cabbage; evolution; expression; phylogeny; two-component system