title: A cotton mitogen-activated protein kinase (GhMPK6) is involved in ABA-induced CAT1 expression and H(2)O(2) production.
abstract: The mitogen-activated protein kinase (MAPK) cascade is one of the major and evolutionally conserved signaling pathways and plays a pivotal role in the regulation of stress and developmental signals in plants. Here, we identified one gene, GhMPK6, encoding an MAPK protein in cotton. GFP fluorescence assay demonstrated that GhMAPK6 is a cytoplasm localized protein. Quantitative RT-PCR analysis revealed that mRNA accumulation of GhMPK6 was significantly promoted by abscisic acid (ABA). Overexpression of GhMPK6 gene in the T-DNA insertion mutant atmkk1 (SALK_015914) conferred a wild-type phenotype to the transgenic plants in response to ABA. Under ABA treatment, cotyledon greening/expansion in GhMPK6 transgenic lines and wild type was significantly inhibited, whereas the atmkk1 mutant showed a relatively high cotyledon greening/expansion ratio. Furthermore, CAT1 expression and H(2)O(2) levels in leaves of GhMPK6 transgenic lines and wild type were remarkably higher than those of atmkk1 mutant with ABA treatment. Collectively, our results suggested that GhMPK6 may play an important role in ABA-induced CAT1 expression and H(2)O(2) production.
authors: Hubei Key Laboratory of Genetic Regulation and Integrative Biology, College of Life Sciences, Central China Normal University, Wuhan.
authors: Juan
authors: J
authors: Luo
authors: Li-Li
authors: LL
authors: Zhao
authors: Si-Ying
authors: SY
authors: Gong
authors: Xiang
authors: X
authors: Sun
authors: Peng
authors: P
authors: Li
authors: Li-Xia
authors: LX
authors: Qin
authors: Ying
authors: Y
authors: Zhou
authors: Wen-Liang
authors: WL
authors: Xu
authors: Xue-Bao
authors: XB
authors: Li
mesh_terms: D000040:Abscisic Acid / Q000378:metabolism*; D000595:Amino Acid Sequence; D018506:Gene Expression Regulation, Plant; D003368:Gossypium / Q000737:chemistry / Q000145:classification / Q000201:enzymology* / Q000235:genetics; D006861:Hydrogen Peroxide / Q000378:metabolism*; D020928:Mitogen-Activated Protein Kinases / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D008969:Molecular Sequence Data; D010802:Phylogeny; D010940:Plant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D016415:Sequence Alignment
chemical_list: D010940:Plant Proteins; D000040:Abscisic Acid; D006861:Hydrogen Peroxide; D020928:Mitogen-Activated Protein Kinases