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
作者: Nguyen, T; Fu, K; Mou, CL; Yu, JF; Zhu, XJ; Huang, YS; Zhou, CL; Hao, QX; Zhang, FL; Song, WH; Wang, P; Chen, YP; Ma, TF; Tian, YL; Liu, SJ; Jiang, L; Wan, JM
作者机构:
关键词: Near-Isogenic Line; Pre-Harvest Sprouting; Qtl; Oryza Sativa
期刊名称: MOLECULAR BREEDING
ISSN: 1380-3743
年卷期: 2020 年 40 卷 8 期
页码:
收录情况: JCR(2021版)
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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