RETARDED PALEA1 Controls Palea Development and Floral Zygomorphy in Rice
RETARDED PALEA1 Controls Palea Development and Floral Zygomorphy in Rice
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RETARDED PALEA1 控制水稻 Palea 发育和花对称性
DOI：
10.1104/pp.108.128231
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发表时间：
2009-01-01
期刊：
影响因子：
7.4
通讯作者：
Zhang, Da-Bing
中科院分区：
文献类型：
--
作者：
Yuan, Zheng;Gao, Shan;Zhang, Da-Bing
禾本科是被子植物中最大的开花植物科之一，其花序和花的形态与真双子叶植物和其它单子叶植物不同。然而，禾本科植物花形态特化的机制仍不清楚。在这里，我们表明，花的左右对称沿着外稃内稃轴在水稻（水稻）是部分或间接决定的CYCLOIDEA（CYC）的同源物延迟PALEA1（REP 1），调节内稃的身份和发展。REP 1基因只在花发育早期的内稃原基中表达，但在花发育后期，REP 1基因呈放射状分散在雄蕊和外稃、内稃的维管束中。rep1突变体的内稃发育明显迟缓，内稃有5个维管束，与野生型外稃的维管束结构相似。此外，REP 1的异位表达导致内稃细胞的不对称过度分化，改变了它们的花的不对称性。因此，这项工作扩展了TCP基因家族成员在定义禾本科植物花形态多样化方面的功能，并表明CYC样基因控制花的两侧对称性的共同保守机制存在于真双子叶植物和禾本科植物中。
Poaceae, one of the largest flowering plant families in angiosperms, evolved distinct inflorescence and flower morphology diverging from eudicots and other monocots. However, the mechanism underlying the specification of flower morphology in grasses remains unclear. Here we show that floral zygomorphy along the lemma-palea axis in rice (Oryza sativa) is partially or indirectly determined by the CYCLOIDEA (CYC)-like homolog RETARDED PALEA1 (REP1), which regulates palea identity and development. The REP1 gene is only expressed in palea primordium during early flower development, but during later floral stages is radially dispersed in stamens and the vascular bundles of the lemma and palea. The development of palea is significantly retarded in the rep1 mutant and its palea has five vascular bundles, which is similar to the vascular pattern of the wild-type lemma. Furthermore, ectopic expression of REP1 caused the asymmetrical overdifferentiation of the palea cells, altering their floral asymmetry. This work therefore extends the function of the TCP gene family members in defining the diversification of floral morphology in grasses and suggests that a common conserved mechanism controlling floral zygomorphy by CYC-like genes exists in both eudicots and the grasses.