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Yang S.M., Zhang S.H., Yang T., Wang L. (2018): Detection of QTLs for cold tolerance at the booting stage in nearisogenic lines derived from rice landrace Lijiangxintuanheigu. Czech J. Genet. Plant Breed., 54: 93−100. 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 (R2) explained by each QTL ranged from 7.71 to 29.66%, with five colocated 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 R2 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.

Detection of QTLs for cold tolerance at the booting stage in near-isogenic lines derived from rice landrace Lijiangxintuanheigu