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| 著者 | Nardmann,J. and Werr,W. | |
| タイトル | The shoot stem cell niche in angiosperms: expression patterns of WUS orthologues in rice and maize imply major modifications in the course of mono- and dicot evolution | |
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Abstract: In Arabidopsis, stem cell homeostasis in the shoot apical meristem (SAM) is controlled by a feedback loop between WUS and CLV functions. We have identified WUS orthologues in maize and rice by a detailed phylogenetic analysis of the WOX gene family and subsequent cloning. A single WUS orthologue is present in the rice genome (OsWUS), whereas the allotetraploid maize genome contains 2 WUS paralogues (ZmWUS1 and ZmWUS2). None of the isolated grass WUS orthologues displays an organizing center-type expression pattern in the vegetative SAM as in Arabidopsis. In contrast, the grass-specific expression patterns relate to the specification of new phytomers consistent with the transcriptional expression patterns of TD1 and FON1 (CLV1 orthologues of maize and rice, respectively). Moreover, the grass WUS and CLV1 orthologues are coexpressed in all reproductive meristems, where fasciation and supernumerary floral organs occur in td1 or fon1 loss-of-function mutants. The expression patterns of WUS orthologues in both grass species compared with those of dicots imply that major changes in WUS function, which are correlated with changes in CLV1 signaling, have occurred during angiosperm evolution and raise doubts about the uniqueness of the WUS/CLV antagonism in the maintenance of the shoot stem cell niche in grasses. |
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| 掲載誌 | Mol. Biol. Evol. | |
| Country | Germany | |
| 刊数 | 23(12) | |
| ページ | 2492-2504 | |
| 発刊年 | 2006 | |
| PubMed ID | 16987950 | |
| PubMed Central ID | - | |
| DOI | 10.1093/molbev/msl125 | |
| URL | - | |
| 関連情報 | ||
| 遺伝子 | FON1 NAL2 QHB TAB1 WOX10 WOX4 WOX5 WOX8 WOX9 WOX9C | |
| INSD | AM234755 AM234746 AM234748 AM234749 AM234750 AM234751 AM234752 AM234753 AM234754 | |
| 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 | - | |
