Natural alleles of GLA for grain length and awn development were differently domesticated in rice subspecies japonica and indica
文献类型： 外文期刊
作者： Zhang, Yanpei 1 ; Zhang, Zhanying 1 ; Sun, Xingming 1 ; Zhu, Xiaoyang 1 ; Li, Ben 1 ; Li, Jinjie 1 ; Guo, Haifeng 1 ; Che 1 ;
作者机构： 1.China Agr Univ, Beijing Key Lab Crop Genet Improvement, Dept Plant Genet & Breeding, Key Lab Crop Heterosis & Utilizat,Minist Educ, Beijing, Peoples R China
2.Guangxi Acad Agr Sci, Rice Res Inst, China Guangxi Key Lab Rice Genet & Breeding, Nanning, Guangxi, Peoples R China
关键词： allelic frequency; awn development; domestication; grain length; natural variation
期刊名称：PLANT BIOTECHNOLOGY JOURNAL （ 影响因子：9.803； 五年影响因子：9.555 ）
ISSN： 1467-7644
年卷期： 2019 年 17 卷 8 期
页码：
收录情况： SCI
摘要： Rice (Oryza sativa L.) cultivars harbour morphological and physiological traits different from those of wild rice (O. rufipogon Griff.), but the molecular mechanisms underlying domestication remain controversial. Here, we show that awn and long grain traits in the near-isogenic NIL-GLA are separately controlled by variations within the GLA (Grain Length and Awn Development) gene, a new allele of GAD1/RAE2, which encodes one member of the EFPL (epidermal patterning factor-like protein) family. Haplotype analyses and transgenic studies revealed that InDel1 (variation for grain length, VGL) in the promoter region of GLA (GLA(VGL)) increases grain length by promoting transcription of GLA. Absence of InDel3 (variation for awn formation, VA) in the coding region (CDS) of GLA (GLA(va)) results in short awn or no awn phenotypes. Analyses of minimum spanning trees and introgression regions demonstrated that An-1, an important gene for awn formation, was preferentially domesticated and its mutation to an-1 was followed by GLA and An-2. Gene flow then occurred between the evolved japonica and indica populations. Quality analysis showed that GLA causes poor grain quality. During genetic improvement, awnlessness was selected in ssp. indica, whereas short-grained and awnless phenotypes with good quality were selected in japonica. Our findings facilitate an understanding of rice domestication and provide a favourable allele for rice breeding.
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