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Identification and mapping of quantitative trait loci for cold tolerance at the booting stage in a japonica rice near-isogenic line

文献类型： 外文期刊

作者： Xu, Li-Ming 1 ; Zhou, Lei 1 ; Zeng, Ya-Wen 2 ; Wang, Feng-Mei 1 ; Zhang, Hong-Liang 1 ; Shen, Shi-Quan; Li, Zi-Chao 1 ;

作者机构： 1.China Agr Univ, Key Lab Crop Genom & Genet Improvement Minist Agr, Key Lab Crop Heterosis & Utilizat Minist Educ, Beijing Key Lab Crop Genet Improvement, Beijing 100094, Peoples R China

2.Yunnan Acad Agr Sci, Biotechnol & Genet Resources Inst, Kunming 650205, Peoples R China

期刊名称：PLANT SCIENCE （ 影响因子：4.729； 五年影响因子：5.132 ）

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收录情况： SCI

摘要： Near-isogenic lines (NILs) are preferred materials for mapping quantitative trait loci (QTLs) and for evaluating gene action or interaction. We developed a set of NILs with cold tolerance at the booting stage by backcrossing the strongly cold-tolerant japonica landrace, Kunmingxiaobaigu (KMXBG) to cold-sensitive japonica cultivar, Towada, as the recipient parent. A BCF line was selected as a parent to construct a BCF segregating population from which BCF lines were developed. Cold tolerance at the booting stage was evaluated on the basis of spikelet fertility of main panicles over 2 years and two locations. Using a LOD significance threshold of 3.0, compositive interval mapping based on a mixed linear model revealed eight QTLs on chromosomes 1, 4, 5, 10 and 11. They were tentatively designated qCTB-1-1, qCTB-4-1, qCTB-4-2, qCTB-5-1, qCTB-5-2, qCTB-10-1, qCTB-10-2 and qCTB-11-1. All alleles for cold tolerance were contributed by KMXBG, and the marker intervals containing them were narrowed to 0.6-5.6cM. Genetic distances between the peaks of the QTL and nearest markers varied from 0 to 1.3cM. The variance explained by a single QTL ranged from 0.90 to 14.86%. Four QTLs, qCTB-1-1, qCTB-4-1, qCTB-5-1, qCTB-5-2 and qCTB-10-1, were detected in two or more trials. Comparisons with previous studies indicated that these QTLs were reliable. Our study sets a foundation for cloning cold-tolerance genes and provides opportunities to understand the mechanism of cold tolerance at the booting stage.

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