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首页> 美国卫生研究院文献>G3: GenesGenomesGenetics >Convergent Loss of Awn in Two Cultivated Rice Species Oryza sativa and Oryza glaberrima Is Caused by Mutations in Different Loci
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Convergent Loss of Awn in Two Cultivated Rice Species Oryza sativa and Oryza glaberrima Is Caused by Mutations in Different Loci

机译：稻米和稻米两个栽培稻种中稻米的收敛损失是由不同基因座的突变引起的

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摘要

A long awn is one of the distinct morphological features of wild rice species. This organ is thought to aid in seed dispersal and prevent predation by animals. Most cultivated varieties of Oryza sativa and Oryza glaberrima, however, have lost the ability to form long awns. The causal genetic factors responsible for the loss of awn in these two rice species remain largely unknown. Here, we evaluated three sets of chromosome segment substitution lines (CSSLs) in a common O. sativa genetic background (cv. Koshihikari) that harbor genomic fragments from Oryza nivara, Oryza rufipogon, and Oryza glaberrima donors. Phenotypic analyses of these libraries revealed the existence of three genes, Regulator of Awn Elongation 1 (RAE1), RAE2, and RAE3, involved in the loss of long awns in cultivated rice. Donor segments at two of these genes, RAE1 and RAE2, induced long awn formation in the CSSLs whereas an O. sativa segment at RAE3 induced long awn formation in O. glaberrima. These results suggest that the two cultivated rice species, O. sativa and O. glaberrima, have taken independent paths to become awnless.
机译：长芒是野生稻种的独特形态特征之一。该器官被认为有助于种子传播并防止动物捕食。然而，大多数栽培的稻（Oryza sativa）和稻（Oryza glaberrima）品种已经失去了形成长芒的能力。在这两个水稻品种中造成芒损失的因果遗传因素仍然未知。在这里，我们评估了在普通稻遗传背景（cv。Koshihikari）中的三组染色体片段替换系（CSSL），这些遗传背景包含了来自Oryza nivara，Oryza rufipogon和Oryza glaberrima供体的基因组片段。对这些文库的表型分析显示，存在三个基因，即伸长率调节子1（RAE1），RAE2和RAE3，它们与稻米中长芒的丢失有关。这些基因中的两个，RAE1和RAE2的供体片段诱导了CSSLs中长芒的形成，而RAE3的O. sativa片段诱导了O. glaberrima中长芒的形成。这些结果表明，两种栽培稻品种O. sativa和O. glaberrima采取了独立的途径成为无芒。

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