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Fine mapping of a major quantitative trait locus, qgnp7(t), controlling grain number per panicle in African rice (Oryza glaberrima S.)

文献类型： 外文期刊

作者： Hu, Zejun 1 ; Cao, Liming 3 ; Sun, Xuejun 1 ; Zhu, Yu 2 ; Zhang, Tianyu 4 ; Jiang, Lin 2 ; Liu, Yahui 2 ; Dong, Siqing 2 ; S 1 ;

作者机构： 1.Jiangxi Agr Univ, Grp Crop Genet & Breeding, Nanchang 330045, Jiangxi, Peoples R China

2.Fudan Univ, Sch Life Sci, Inst Genet, State Key Lab Genet Engn, Shanghai 200433, Peoples R China

3.Shanghai Acad Agr Sci, Inst Crop Breeding & Cultivat, Shanghai 201403, Peoples R China

4.Deng Jia Bu Rice Fdn Seed Farm Jiangxi Prov, Yujiang 335200, Peoples R China

关键词： African rice (Oryza glaberrima S.); grain number per panicle; chromosome segment substituted lines; fine mapping

期刊名称：BREEDING SCIENCE （ 影响因子：2.086； 五年影响因子：2.632 ）

ISSN： 1344-7610

年卷期： 2018 年 68 卷 5 期

页码：

收录情况： SCI

摘要： Grain number per panicle is a major component of rice yield that is typically controlled by many quantitative trait loci (QTLs). The identification of genes controlling grain number per panicle in rice would be valuable for the breeding of high-yielding rice. The Oryza glaberrima chromosome segment substitution line 9IL188 had significantly smaller panicles compared with the recurrent parent 9311. QTL analysis in an F-2 population derived from a cross between 9IL188 and 9311 revealed that qgnp7(t), a major QTL located on the short arm of chromosome 7, was responsible for this phenotypic variation. Fine mapping was conducted using a large F-3 population containing 2250 individuals that were derived from the F-2 heterozygous plants. Additionally, plant height, panicle length, and grain number per panicle of the key F-4 recombinant families were examined. Through two-step substitution mapping, qgnp7(t) was finally localized to a 41 kb interval in which eight annotated genes were identified according to available sequence annotation databases. Phenotypic evaluation of near isogenic lines (NIL-qgnp7 and NIL-qGNP7) indicated that qgnp7(t) has pleiotropic effects on rice plant architecture and panicle structure. In addition, yield estimation of NILs indicated that qGNP7(t) derived from 9311 is the favorable allele. Our results provide a foundation for isolating qgnp7(t). Markers flanking this QTL will be a useful tool for the marker-assisted selection of favorable alleles in O. glaberrima improvement programs.

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