title: Genome-wide identification and homeolog-specific expression analysis of the SnRK2 genes in Brassica napus guard cells.
abstract: Sucrose non-fermenting-1-related protein kinase 2 (SnRK2) proteins constitute a small plant-specific serine/threonine kinase family involved in abscisic acid (ABA) signaling and plant responses to biotic and abiotic stresses. Although SnRK2s have been well-studied in Arabidopsis thaliana, little is known about SnRK2s in Brassica napus. Here we identified 30 putative sequences encoding 10 SnRK2 proteins in the B. napus genome and the expression profiles of a subset of 14 SnRK2 genes in guard cells of B. napus. In agreement with its polyploid origin, B. napus maintains both homeologs from its diploid parents. The results of quantitative real-time PCR (qRT-PCR) and reanalysis of RNA-Seq data showed that certain BnSnRK2 genes were commonly expressed in leaf tissues in different varieties of B. napus. In particular, qRT-PCR results showed that 12 of the 14 BnSnRK2s responded to drought stress in leaves and in ABA-treated guard cells. Among them, BnSnRK2.4 and BnSnRK2.6 were of interest because of their robust responsiveness to ABA treatment and drought stress. Notably, BnSnRK2 genes exhibited up-regulation of different homeologs, particularly in response to abiotic stress. The homeolog expression bias in BnSnRK2 genes suggests that parental origin of genes might be responsible for efficient regulation of stress responses in polyploids. This work has laid a foundation for future functional characterization of the different BnSnKR2 homeologs in B. napus and its parents, especially their functions in guard cell signaling and stress responses.
authors.affiliation: Department of Biology, Genetics Institute, University of Florida, Gainesville, FL, 32610, USA.
authors.forename: Mi-Jeong
authors.initials: MJ
authors.lastname: Yoo
authors.affiliation: Department of Biology, Genetics Institute, University of Florida, Gainesville, FL, 32610, USA.|College of Life Sciences, Northeast Forestry University, Harbin, 150040, China.
authors.forename: Tianyi
authors.initials: T
authors.lastname: Ma
authors.affiliation: Department of Biology, Genetics Institute, University of Florida, Gainesville, FL, 32610, USA.
authors.forename: Ning
authors.initials: N
authors.lastname: Zhu
authors.affiliation: Department of Biology, Genetics Institute, University of Florida, Gainesville, FL, 32610, USA.|Key Laboratory of Horticultural Plant Growth, Development and Quality Improvement, Ministry of Agriculture, Department of Horticulture, Zhejiang University, Hangzhou, 310058, China.
authors.forename: Lihong
authors.initials: L
authors.lastname: Liu
authors.affiliation: Department of Biology, Genetics Institute, University of Florida, Gainesville, FL, 32610, USA.|Plant Molecular and Cellular Biology, University of Florida, Gainesville, FL, 32611, USA.
authors.forename: Alice C
authors.initials: AC
authors.lastname: Harmon
authors.affiliation: Key Laboratory of Horticultural Plant Growth, Development and Quality Improvement, Ministry of Agriculture, Department of Horticulture, Zhejiang University, Hangzhou, 310058, China.
authors.forename: Qiaomei
authors.initials: Q
authors.lastname: Wang
authors.affiliation: Department of Biology, Genetics Institute, University of Florida, Gainesville, FL, 32610, USA. schen@ufl.edu.|Plant Molecular and Cellular Biology, University of Florida, Gainesville, FL, 32611, USA. schen@ufl.edu.|Proteomics and Mass Spectrometry, Interdisciplinary Center for Biotechnology Research, University of Florida, Gainesville, FL, 32610, USA. schen@ufl.edu.
authors.forename: Sixue
authors.initials: S
authors.lastname: Chen
mesh_terms: D000040:Abscisic Acid / Q000494:pharmacology; D029688:Brassica napus / Q000166:cytology / Q000502:physiology*; D018506:Gene Expression Regulation, Plant / Q000187:drug effects / Q000502:physiology*; D055106:Genome-Wide Association Study; D010802:Phylogeny; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism*; D054046:Plant Stomata / Q000166:cytology*; D013312:Stress, Physiological; D014867:Water / Q000378:metabolism
chemical_list: D010940:Plant Proteins; D014867:Water; D000040:Abscisic Acid
keywords: ABA; Brassica napus; Expression bias; Guard cells; Homeolog; Polyploid; Stress