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| 著者 | Tong H.a, Xiao Y.a, Liu D.a, Gao S.a, Liu L.a, Yin Y.b, Jin Y.c, Qian Q.d, Chu C.a | |
| タイトル | Brassinosteroid regulates cell elongation by modulating gibberellin metabolism in ricec w open | |
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Abstract: Brassinosteroid (BR) and gibberellin (GA) are two predominant hormones regulating plant cell elongation. A defect in either of these leads to reduced plant growth and dwarfism. However, their relationship remains unknown in rice (Oryza sativa). Here, we demonstrated that BR regulates cell elongation by modulating GA metabolism in rice. Under physiological conditions, BR promotes GA accumulation by regulating the expression of GA metabolic genes to stimulate cell elongation. BR greatly induces the expression of d18/GA3ox-2, one of the GA biosynthetic genes, leading to increased GA1 levels, the bioactive GA in rice seedlings. Consequently, both d18 and loss-of-function GA-signaling mutants have decreased BR sensitivity. When excessive active BR is applied, the hormone mostly induces GA inactivation through upregulation of the GA inactivation gene GA2ox-3 and also represses BR biosynthesis, resulting in decreased hormone levels and growth inhibition. As a feedback mechanism, GA extensively inhibits BR biosynthesis and the BR response. GA treatment decreases the enlarged leaf angles in plants with enhanced BR biosynthesis or signaling. Our results revealed a previously unknown mechanism underlying BR and GA crosstalk depending on tissues and hormone levels, which greatly advances our understanding of hormone actions in crop plants and appears much different from that in Arabidopsis thaliana. |
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| 掲載誌 | Plant Cell | |
| Country | China | |
| 刊数 | 26 | |
| ページ | 4376-4393 | |
| 発刊年 | 2014 | |
| PubMed ID | 25371548 | |
| PubMed Central ID | - | |
| DOI | 10.1105/tpc.114.132092 | |
| URL | - | |
| 関連情報 | ||
| 遺伝子 | BIN2 BRD1 BZR1 D11 D18 D2 D35 D61 DLT EUI1 GA2OX3 GID1 GID2 GNP1 SD1 SLR1 | |
| INSD | - | |
| 系統 |
野生イネ コアコレクション |
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| 突然変異系統(遺伝研 Collection) | - | |
| 種子不稔系統 | - | |
| 致死変異体系統 | - | |
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組織別発生段階 - 突然変異系統(遺伝子) |
- | |
| 栽培イネ品種(遺伝研 Collection) | - | |
| 組織別発生段階 | - | |
