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

Pei Sun; Fengxia Liu; Lubin Tan; Zuofeng Zhu; Yongcai Fu; Chuanqing Sun; Hongwei Cai

Pei Sun Department of Plant Genetics and Breeding, Collage of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
Fengxia Liu Department of Plant Genetics and Breeding, Collage of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
Lubin Tan Department of Plant Genetics and Breeding, Collage of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
Zuofeng Zhu Department of Plant Genetics and Breeding, Collage of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
Yongcai Fu Department of Plant Genetics and Breeding, Collage of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
Chuanqing Sun Department of Plant Genetics and Breeding, Collage of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
Hongwei Cai Department of Plant Genetics and Breeding, Collage of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China

Keywords: Genome region, low temperature tolerance, potassium chlorate resistance, quantitative trait locus,rice

Abstract

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 15o and 28o. 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.