title: Novel rice MAP kinases OsMSRMK3 and OsWJUMK1 involved in encountering diverse environmental stresses and developmental regulation.
abstract: We report isolation of two novel rice (Oryza sativa L.) mitogen-activated protein kinases (MAPKs), OsMSRMK3 (multiple stress responsive) and OsWJUMK1 (wound- and JA-uninducible) that most likely exist as single copy genes in its genome. OsMSRMK3 and OsWJUMK1 encode 369 and 569 amino acid polypeptides having the MAPK family signature and phosphorylation activation motifs TEY and TDY, respectively. Steady state mRNA analyses of these MAPKs with constitutive expression in leaves of two-week-old seedlings revealed that OsMSRMK3 was up-regulated upon wounding (by cut), jasmonic acid (JA), salicylic acid (SA), ethylene, abscisic acid, hydrogen peroxide (H(2)O(2)), protein phosphatase inhibitors, chitosan, high salt/sugar, and heavy metals, whereas OsWJUMK1 not induced by either wounding, JA or SA, showed up-regulation only by H(2)O(2), heavy metals, and cold stress (12 degrees C). Moreover, these MAPKs were developmentally regulated. These results strongly suggest a role for OsMSRMK3 and OsWJUMK1 in both stress-signalling pathways and development in rice.
authors.affiliation: Research Laboratory for Agricultural Biotechnology and Biochemistry (RLABB), GPO Box 8207, Kathmandu, Nepal.
authors.forename: Ganesh K
authors.initials: GK
authors.lastname: Agrawal
authors.forename: Shyam K
authors.initials: SK
authors.lastname: Agrawal
authors.forename: Junko
authors.initials: J
authors.lastname: Shibato
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Iwahashi
authors.forename: Randeep
authors.initials: R
authors.lastname: Rakwal
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D003517:Cyclopentanes / Q000494:pharmacology; D004777:Environment; D004790:Enzyme Induction / Q000187:drug effects; D018507:Gene Expression Regulation, Developmental / Q000502:physiology*; D018506:Gene Expression Regulation, Plant / Q000502:physiology*; D020928:Mitogen-Activated Protein Kinases / Q000235:genetics / Q000378:metabolism*; D008969:Molecular Sequence Data; D012275:Oryza; D054883:Oxylipins; D010802:Phylogeny; D010937:Plant Growth Regulators / Q000494:pharmacology; D018515:Plant Leaves / Q000201:enzymology; D012333:RNA, Messenger / Q000378:metabolism; D036226:Seedlings / Q000201:enzymology; D017386:Sequence Homology, Amino Acid
chemical_list: D003517:Cyclopentanes; D054883:Oxylipins; D010937:Plant Growth Regulators; D012333:RNA, Messenger; C011006:jasmonic acid; D020928:Mitogen-Activated Protein Kinases