title: Abscisic acid promoted changes in the protein profiles of rice seedling by proteome analysis.
abstract: This study investigates the influence of exogenously applied abscisic acid (ABA) on the leaves and leaf sheaths of two-week-old rice seedling at the level of the proteome. Significant differences were observed in the two-dimensional polyacrylamide gel electrophoresis protein profiles between control and ABA treated samples. Amino-acid sequence analysis of affected proteins revealed that ABA caused drastic changes in the major photosynthetic protein, ribulose 1,5-bisphosphate carboxylase/oxygenase and accumulation of certain defense/stress-related proteins. Moreover, cutting or treating leaf sheaths with jasmonic acid (JA) rapidly increased the endogenous level of ABA, suggesting a role for ABA during the defense/stress-response. Comparative study indicated a potential overlap between ABA and JA as detected at the level of the proteome. Furthermore, in vitro protein phosphorylation experiments and in-gel kinase assays also revealed considerable changes in the phosphorylation status of some proteins, and differential effects on myelin basic protein and calcium-dependent protein kinase activities by ABA treatment, which suggests involvement of kinase in the downstream signaling cascade. These results provide evidence at proteome level for the involvement of ABA in stress-response in rice seedling.
authors.affiliation: Molecular Genetics Department, National Institute of Agrobiological Sciences, Tsukuba 305-8602, Japan.
authors.forename: Randeep
authors.initials: R
authors.lastname: Rakwal
authors.forename: Setsuko
authors.initials: S
authors.lastname: Komatsu
mesh_terms: D000040:Abscisic Acid / Q000378:metabolism / Q000494:pharmacology*; D000595:Amino Acid Sequence; D002118:Calcium / Q000494:pharmacology; D017871:Calcium-Calmodulin-Dependent Protein Kinases / Q000378:metabolism; D015180:Electrophoresis, Gel, Two-Dimensional; D004591:Electrophoresis, Polyacrylamide Gel; D018506:Gene Expression Regulation, Plant / Q000187:drug effects*; D008969:Molecular Sequence Data; D004676:Myelin Basic Protein / Q000378:metabolism; D012275:Oryza / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism*; D010766:Phosphorylation / Q000187:drug effects; D018515:Plant Leaves / Q000033:anatomy & histology / Q000187:drug effects / Q000378:metabolism; D010940:Plant Proteins / Q000737:chemistry / Q000378:metabolism*; D040081:Protein Array Analysis; D020543:Proteome / Q000737:chemistry / Q000378:metabolism*; D012273:Ribulose-Bisphosphate Carboxylase / Q000378:metabolism; D036226:Seedlings / Q000187:drug effects* / Q000378:metabolism; D017386:Sequence Homology, Amino Acid
chemical_list: D004676:Myelin Basic Protein; D010940:Plant Proteins; D020543:Proteome; D000040:Abscisic Acid; D017871:Calcium-Calmodulin-Dependent Protein Kinases; D012273:Ribulose-Bisphosphate Carboxylase; D002118:Calcium