title: OsMPK6 plays a critical role in cell differentiation during early embryogenesis in Oryza sativa.
abstract: The formation of body axes is the basis of morphogenesis during plant embryogenesis. We identified embryo-lethal mutants of rice (Oryza sativa) in which T-DNAs were inserted in OsMPK6 Embryonic organs were absent because their development was arrested at the globular stage. Similar to observations made with gle4, shootless, and organless, the osmpk6 mutations affected the initial step of cell differentiation. Expression of an apical-basal axis marker gene, OSH1, was reduced in the mutant embryos while that of the radial axes marker genes OsSCR and OsPNH1 was not detected. The signal for ROC1, a protodermal cell marker, was weak at the globular stage and gradually disappeared. Transcript levels of auxin and gibberellin biosynthesis genes were diminished in osmpk6 embryos. In addition, phytoalexin biosynthesis genes were down-regulated in osmpk6 and a major diterpene phytoalexin, momilactone A, did not accumulate in the mutant embryos. These results indicate that OsMPK6 begins to play a critical role during early embryogenesis, especially when the L1 radial axis is being formed.
authors.affiliation: Crop Biotech Institute and Graduate School of Biotechnology, Kyung Hee University, Yongin, 446-701, Republic of Korea.
authors.forename: Jakyung
authors.initials: J
authors.lastname: Yi
authors.affiliation: Crop Biotech Institute and Graduate School of Biotechnology, Kyung Hee University, Yongin, 446-701, Republic of Korea.
authors.forename: Yang-Seok
authors.initials: YS
authors.lastname: Lee
authors.affiliation: Crop Biotech Institute and Graduate School of Biotechnology, Kyung Hee University, Yongin, 446-701, Republic of Korea.
authors.forename: Dong-Yeon
authors.initials: DY
authors.lastname: Lee
authors.affiliation: Crop Biotech Institute and Graduate School of Biotechnology, Kyung Hee University, Yongin, 446-701, Republic of Korea.
authors.forename: Man-Ho
authors.initials: MH
authors.lastname: Cho
authors.affiliation: Crop Biotech Institute and Graduate School of Biotechnology, Kyung Hee University, Yongin, 446-701, Republic of Korea.
authors.forename: Jong-Seong
authors.initials: JS
authors.lastname: Jeon
authors.affiliation: Crop Biotech Institute and Graduate School of Biotechnology, Kyung Hee University, Yongin, 446-701, Republic of Korea genean@khu.ac.kr.
authors.forename: Gynheung
authors.initials: G
authors.lastname: An
mesh_terms: D053898:Biosynthetic Pathways / Q000187:drug effects / Q000235:genetics; D002454:Cell Differentiation / Q000187:drug effects; D020090:Chromosome Segregation / Q000187:drug effects; D004269:DNA, Bacterial / Q000235:genetics; D004224:Diterpenes / Q000494:pharmacology; D056625:Endosperm / Q000187:drug effects / Q000235:genetics / Q000378:metabolism; D020869:Gene Expression Profiling; D018507:Gene Expression Regulation, Developmental / Q000187:drug effects; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D017343:Genes, Plant; D016254:Mutagenesis, Insertional / Q000235:genetics; D009154:Mutation / Q000235:genetics; D012275:Oryza / Q000166:cytology* / Q000187:drug effects / Q000196:embryology / Q000201:enzymology*; D010641:Phenotype; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism*; D012717:Sesquiterpenes / Q000378:metabolism; D000094162:Phytoalexins
chemical_list: D004269:DNA, Bacterial; D004224:Diterpenes; D010940:Plant Proteins; D012717:Sesquiterpenes; C036483:T-DNA; C116023:momilactone A; D000094162:Phytoalexins
keywords: Axis formation; OsMPK6; embryogenesis; globular embryo; phytoalexin; rice.