title: GsSKP21, a Glycine soja S-phase kinase-associated protein, mediates the regulation of plant alkaline tolerance and ABA sensitivity.
abstract: Plant SKP1-like family proteins, components of the SCF complex E3 ligases, are involved in the regulation of plant development and stress responses. Little is known about the precise function of SKP genes in plant responses to environmental stresses. GsSKP21 was initially identified as a potential stress-responsive gene based on the transcriptome sequencing of Glycine soja. In this study, we found that GsSKP21 protein contains highly conserved SKP domains in its N terminus and an extra unidentified domain in its C terminus. The transcript abundance of GsSKP21, detected by quantitative real-time PCR, was induced under the treatment of alkali and salt stresses. Overexpression of GsSKP21 in Arabidopsis dramatically increased plant tolerance to alkali stress. Furthermore, we found that overexpression of GsSKP21 resulted in decreased ABA sensitivity during both the seed germination and early seedling growth stages. GsSKP21 mediated ABA signaling by altering the expression levels of the ABA signaling-related and ABA-induced genes. We also investigated the tissue expression specificity and subcellular localization of GsSKP21. These results suggest that GsSKP21 is important for plant tolerance to alkali stress and plays a critical regulatory role in the ABA-mediated stress response.
authors.affiliation: Key Laboratory of Agricultural Biological Functional Genes, Northeast Agricultural University, Harbin, 150030, People's Republic of China, merestarry@gmail.com.
authors.forename: Ailin
authors.initials: A
authors.lastname: Liu
authors.forename: Yang
authors.initials: Y
authors.lastname: Yu
authors.forename: Xiangbo
authors.initials: X
authors.lastname: Duan
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Sun
authors.forename: Huizi
authors.initials: H
authors.lastname: Duanmu
authors.forename: Yanming
authors.initials: Y
authors.lastname: Zhu
mesh_terms: D000040:Abscisic Acid / Q000378:metabolism*; D000222:Adaptation, Physiological; D000468:Alkalies; D001483:Base Sequence; D003001:Cloning, Molecular; D017931:DNA Primers; D010802:Phylogeny; D030821:Plants, Genetically Modified; D044786:S-Phase Kinase-Associated Proteins / Q000145:classification / Q000235:genetics / Q000502:physiology*; D013025:Glycine max / Q000201:enzymology* / Q000502:physiology
chemical_list: D000468:Alkalies; D017931:DNA Primers; D044786:S-Phase Kinase-Associated Proteins; D000040:Abscisic Acid