Quantitative trait loci (QTLs) for potassium chlorate resistance and low temperature tolerance in seedling stage in rice (Oryza sativa L.).

摘要

An F₈ recombinant inbred lines (RIL) population was used to identify quantitative trait loci (QTLs) for potassium chlorate (KClO₃) resistance and low temperature tolerance (LTT), two key physiological traits to distinguish rice subspecies, indica and japonica. Four traits were measured for KClO₃ resistance including shoot length, root length, shoot length and root length ratios of treatment and control conditions, and four traits for LTT including shoot length, root length and germination rate in 15 degrees and 28 degrees . A total of six QTLs were identified on chromosomes 2, 4, 7 and 10 for KClO₃, including a major QTL qSLratio-2, which accounted for 40% of the phenotypic variance. On the other hand, a total of four QTLs for LTT were identified on chromosomes 2 and 4. These results will be useful in marker-assisted selections for these two important traits.