Fine mapping ofqSdr9, a novel locus for seed dormancy (SD) in weedy rice, and development of NILs with a strong SD allele

文献类型： 外文期刊

第一作者： Nguyen, Thanhliem

作者： Nguyen, Thanhliem;Fu, Kai;Mou, Changling;Yu, Jiangfeng;Zhu, Xingjie;Huang, Yunshuai;Zhou, Chunlei;Hao, Qixian;Zhang, Fulin;Song, Weihan;Wang, Ping;Chen, Yaping;Ma, Tengfei;Tian, Yunlu;Liu, Shijia;Jiang, Ling;Wan, Jianmin;Nguyen, Thanhliem;Wan, Jianmin

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关键词： Near-isogenic line; Pre-harvest sprouting; QTL; Oryza sativa

期刊名称：MOLECULAR BREEDING （ 影响因子：2.589； 五年影响因子：2.75 ）

ISSN： 1380-3743

年卷期： 2020 年 40 卷 8 期

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收录情况： SCI

摘要： Lack of seed dormancy, a major cause of pre-harvest sprouting in rice and other cereal crops, causes significant reductions in grain yield and quality. Weedy rice is often strongly dormant; therefore, quantitative trait loci (QTLs) related to seed dormancy in weedy rice "Ludao" could be useful for improving pre-harvest sprouting resistance in the importantjaponicavariety "Ninggeng 4." To identify SD QTLs in variety Ludao, we constructed an advanced backcross population (BC6F2) of Ninggeng 4 with Ludao as the donor parent by marker-assisted backcrossing followed by SD phenotyping. The consistently detected QTLqSdr9on chromosome 9L explained 18.09% of the phenotypic variance, and the Ludao allele decreased germination percentage by 10.78%.qSdr9was fine-mapped to a 586.60 kb region between markers QNU9-10 and RM5777. Based on the closest linked marker for locusqSdr9, we developed near-isogenic lines with theqSdr9allele from Ludao in Ninggeng 4 background. TheqSdr9near-isogenic lines with strong SD will be useful as parents in breeding for pre-harvest sprouting resistance.

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