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Detection of QTLs for Cold Tolerance at the Booting Stage in Near-isogenic Lines Derived from Rice Landrace Lijiangxintuanheigu

文献类型： 外文期刊

作者： Yang, Shu Ming 1 ; Zhang, Su Hua 1 ; Yang, Tao 1 ; Wang, Li 3 ;

作者机构： 1.Yunnan Acad Agr Sci, Biotechnol & Genet Resources Inst, Kunming, Yunnan, Peoples R China

2.Agr Biotechnol Key Lab Yunnan Prov, Kunming, Yunnan, Peoples R China

3.Yunnan Agr Univ, Coll Agron & Biotechnol, Kunming, Yunnan, Peoples R China

关键词： Oryza sativa; quantitative trait loci; near-isogenic lines; cold tolerance at the booting stage

期刊名称：CZECH JOURNAL OF GENETICS AND PLANT BREEDING （ 影响因子：0.865； 五年影响因子：1.017 ）

ISSN： 1212-1975

年卷期： 2018 年 54 卷 3 期

页码：

收录情况： SCI

摘要： Chilling damage significantly reduces grain yield in rice, while the utilisation of major quantitative trait loci (QTLs) can potentially improve rice yielding. Mapping of QTLs for 5 cold tolerance-related traits at the booting stage was conducted with SSR markers, including composite interval mapping (ICIM). 105 near-isogenic lines, derived from a backcross between Lijiangxintuanheigu (LTH, cold-tolerant landrace) and Towada (cold-sensitive cultivar) were analysed. Phenotype values were investigated under five cold-stress environments and analysed by the best linear unbiased prediction (BLUP). Twenty-one QTLs were identified on chromosomes 1, 2, 3, 4, 6, 7, 10 and 11, and the amount of variation (R-2) explained by each QTL ranged from 7.71 to 29.66%, with five co-located QTL regions. Eight novel major loci (qSF-2, qSF-6a, qSF-7, qGW-6, qDGWP-4, qDSWPP-4, qDWPP-1 and qDWPP-4b) were detected in several environments and by using BLUP. Their alleles were derived from the cultivar LTH with R-2 variance from 12.24 to 29.66%. These favourable QTLs would help to elucidate the genetic mechanism of cold tolerance and provide strategies for breeding of high-yielding rice.

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