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首页> 外文期刊>Developmental cell >Brassinosteroid Signaling Regulates Leaf Erectness in Oryza sativa via the Control of a Specific U-Type Cyclin and Cell Proliferation
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Brassinosteroid Signaling Regulates Leaf Erectness in Oryza sativa via the Control of a Specific U-Type Cyclin and Cell Proliferation

机译:油菜素类固醇信号传导通过控制特定的U型细胞周期蛋白和细胞增殖来调节水稻的叶直立。

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摘要

Leaf erectness is key in determining plant architecture and yield, particularly in cereal crops. Brassinos-teroids (BRs) play a unique role in controlling this trait in monocots, but the underlying cellular and molecular mechanisms remain big mysteries. Here we report that the abaxial sclerenchyma cell number of rice lamina joints (LJs) is closely related to leaf erectness, and BR signaling tightly regulates their proliferation. We identified a rice U-type cyclin CYC U4;1 enriched in rice LJs, with its expression accompanying LJ development. Genetic and biochemical studies demonstrated that CYC U4;1 plays a positive role in promoting leaf erectness by controlling the abaxial sclerenchyma cell proliferation. Furthermore, BR signaling inhibits the abaxial sclerenchyma cell division by coordinately regulating CYC U4;1 expression through BES1 and CYC U4;1 protein activity through GSK3 kinases. These results support a key role of the cyclin CYC U4;1 in mediating BR-regulated cell division to control leaf erectness.
机译:叶的勃起是决定植物结构和产量的关键,特别是在谷物作物中。芸苔属-类固醇(BRs)在控制单子叶植物的这一性状中起着独特的作用,但潜在的细胞和分子机制仍是一个大谜。在这里我们报道,水稻椎板关节(LJs)的背面巩膜细胞数与叶片勃起密切相关,BR信号紧密调节其增殖。我们鉴定了富含水稻LJs的水稻U型细胞周期蛋白CYC U4; 1,其表达伴随LJ的发展。遗传和生化研究表明,CYC U4; 1通过控制背面巩膜层细胞增殖在促进叶片勃起中起积极作用。此外,BR信号转导通过BES1通过CYC U4; 1的表达和GSK3激酶通过CYC U4; 1的蛋白活性协调调节,从而抑制了腹部巩膜外层细胞分裂。这些结果支持细胞周期蛋白CYC U4; 1在介导BR调节的细胞分裂以控制叶片直立中的关键作用。

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