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Simple sequence repeat markers reveal multiple loci governing grain-size variations in a japonica rice (Oryza sativa L.) mutant induced by cosmic radiation during space flight

文献类型： 外文期刊

作者： Wang, Junmin 1 ; Wei, Lijun 2 ; Zheng, Tianqing 3 ; Zhao, Xiuqin 3 ; Ali, Jauhar 4 ; Xu, Jianlong 3 ; Li, Zhikang 3 ;

作者机构： 1.Zhejiang Acad Agr Sci, Hangzhou 310021, Zhejiang, Peoples R China

2.Harbin Inst Technol, Harbin 150001, Peoples R China

3.Chinese Acad Agr Sci, Natl Key Facil Crop Gene Resources & Genet Improv, Inst Crop Sci, Beijing 100081, Peoples R China

4.Int Rice Res Inst, PBGB Div, Manila, Philippines

关键词： Grain size;Grain quality;Quantitative trait locus (QTL);Cosmic radiation mutagenesis;Japonica rice

期刊名称：EUPHYTICA （ 影响因子：1.895； 五年影响因子：2.181 ）

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收录情况： SCI

摘要： Quantitative trait locus (QTL) for grain size traits that include grain length (GL), grain width (GW), grain thickness (GT) as well as thousand grain weight (TGW) were identified using F-2 population derived from a cross between a japonica cultivar Nongken58 and its large grain-sized mutant, 'Dali', which was selected in SP2 generation of plants from Nongken58 seeds exposed to cosmic radiation upon space-flight, and then advanced it over eight successive generations by bagging the panicles to ensure self pollination. 'Dali' had similar GW and GT but 4.8 mm longer in GL, and 18.1 g heavier in TGW than those of Nongken58. Seven main-effect QTLs (M-QTLs) were identified for the grain size and weight traits. Among them, three M-QTLs, QGs3a and QGs3b for both GL and TGW, and QGs5 for GW, GT and TGW, which had strong additive effects on grain shape and grain weight, were validated in the two F-2 plant-derived F-3 populations. The three M-QTLs were found to be nonallelic to the cloned genes GS3, GL3.1, qSW5 and QGs5 by comparative mapping. However, there was only one pair of digenic epistasis involving QGs3b for TGW detected in this population. Interestingly, homozygous 'Dali' alleles at the QGs3a, QGs3b and QGs5 showed significant increase in the grain size and weight, suggesting these novel alleles of 'Dali' at the above three loci may be a very useful for marker-assisted improvement of grain quality for japonica cultivars.

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