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QTL mapping and validation of a segment responsible for early-seedling cold tolerance in rice

文献类型： 外文期刊

作者： Liu, Wenqiang 1 ; Pan, Xiaowu 1 ; Xiong, Haibo 1 ; Huang, Fenglin 1 ; Duan, Yonghong 1 ; Li, Yongchao 1 ; Min, Jun 1 ; Li 1 ;

作者机构： 1.Hunan Acad Agr Sci, Hunan Rice Res Inst, Changsha 410125, Hunan, Peoples R China

2.Minist Agr, Key Lab Indica Rice Genet & Breeding Middle & Low, Changsha 410125, Hunan, Peoples R China

关键词： Rice; Quantitative trait locus (QTL); Recombinant inbred line (RIL); Residual heterozygous line (RHL)

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

ISSN： 0014-2336

年卷期： 2020 年 216 卷 1 期

页码：

收录情况： SCI

摘要： Cold stress at the early-seedling stage is one of the major determinants of uniform seedling establishment. In this work, a recombinant inbred line (RIL) population consisting of 172 lines derived from a cross between Xiang743 (highly cold-tolerant) and Katy (moderately cold-sensitive) was used to map quantitative trait locus (QTL) for early-seedling cold tolerance (ESCT). A total of six QTLs were detected that were distributed on six chromosomes, and explained a total phenotypic variance of 36.8%. All alleles from Xiang743 increased ESCT. Among them, the QTL qESCT-3 was detected in the interval RM520-RM85 on chromosome 3, which was also identified in the same interval in an F-2 population derived from the same parents in a previous study. To determine the effect of qESCT-3, two residual heterozygous lines (RHLs) segregating in the target segment were selected from the RILs to develop two secondary populations. The presence of QTL qESCT-3 was confirmed in the interval RM520-RM85 in the two populations, and the qESCT-3 from Xiang743 increased ESCT. The study shows that the qESCT-3 segment is responsible for cold tolerance at the early-seedling stage and provides RHL materials for fine mapping of qESCT-3. The markers flanking qESCT-3 will be useful in the improvement of ESCT in rice breeding programs.

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