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Reference Detail
| Reference | ||
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| Author | Nakamura A,Fujioka S,Takatsuto S,Tsujimoto M,Kitano H,Yoshida S,Asami T,Nakano T | |
| Title | Involvement of C-22-hydroxylated brassinosteroids in auxin-induced lamina joint bending in rice. | |
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Abstract: The rice lamina joint is ideal material for investigating the activity of brassinosteroids (BRs) and auxin because of its high sensitivity to these compounds. Using a series of rice BR biosynthetic and receptor mutants, we conducted lamina joint tests to elucidate the mechanism of cross-talk between BR and auxin signaling in lamina joint bending. In BR biosynthetic mutants d2 and brd1, which are defective in C-23 hydroxylase and C-6 oxidase, respectively, the lamina joint response to auxin was significantly higher than that of wild-type plants. The other BR-biosynthetic mutants, brd2, osdwarf4 and d11, which are defective in C-22-hydroxylated BRs, showed less or no response to auxin. These results suggest that C-22-hydroxylated BRs are involved in auxin-induced lamina joint bending. The results were supported by the observation that inhibition of the hyper-response to auxin in d2 was reduced by treatment with brassinazole, which inhibits the function of DWARF4, the C-22 hydroxylase. In d61, which is defective in OsBRI1, a possible BR receptor in rice, the bending angle of the lamina joint in response to auxin and C-22-hydroxylated 6-deoxoBRs was nearly the same as that in wild-type plants. This implies that C-22-hydroxylated BRs function in auxin signaling independently of OsBRI1. From these observations, we propose that C-22-hydroxylated BRs participate in auxin signaling via a novel OsBRI1-independent signaling pathway. |
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| Journal | Plant Cell Physiol. | |
| Country | Japan | |
| Volume | 50(9) | |
| Pages | 1627-35 | |
| Year | 2009 | |
| PubMed ID | 19605414 | |
| PubMed Central ID | - | |
| DOI | 10.1093/pcp/pcp106 | |
| URL | - | |
| Relation | ||
| Gene | BRD1 BRD2 D11 D2 D61 DWARF4 | |
| INSD | - | |
| Strain | Wild Core Collection | - |
| Induced Mutation Lines(NIG Collection) | - | |
| Sterile Seed Strain | - | |
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Lethal Embryo Mutantion Strain |
- | |
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Stages in Each Organ - Muant Lines (Gene) |
- | |
| Cultivated Varieties(NIG Collection) | - | |
| Stages in Each Organ | - | |
