期刊
JOURNAL OF EXPERIMENTAL BOTANY
卷 67, 期 8, 页码 2425-2437出版社
OXFORD UNIV PRESS
DOI: 10.1093/jxb/erw052
关键词
Axis formation; embryogenesis; globular embryo; OsMPK6; phytoalexin; rice
资金
- Basic Research Promotion Fund, Republic of Korea [KRF-2007-0093862]
- Next-Generation BioGreen 21 Program (Plant Molecular Breeding Center) [PJ01108001]
- Rural Development Administration, Republic of Korea
- Kyung Hee University [20130214]
The MAP kinase cascade controls early embryogenesis prior to axis formation.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.
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