바스마티 품종을 활용한 벼 종자 크기 관련 양적형질 유전자좌 분석

QTL Analysis Related to Grain Size Using the Population Derived from a Cross Between Hopum and Basmati

The grain size and shape have a significant impact on the grain quality and yield of rice. Additionally, due to the globalization ofthe rice market, there is a demand for rice varieties of various sizes. In this study, we analyzed quantitative trait loci (QTL) associated withgrain length (GL), grain width (GW), grain thickness (GT) and ratio of length-to-width (RLW) using 149 F2 plants obtained from a cross betweenHopum and Basmati 370. To construct a linkage map, we utilized 89 Fluidigm SNP markers, which covered a span of 1,116 cM of F2 population. Nine QTLs associated with four traits were identified on chromosomes 2, 3, 5, and 7. One major QTL on chromosome 3 accounted for43.2% of the phenotypic variation in GL. Additionally, QTLs named qGW2 and qGW5 on chromosomes 2 and 5 were detected for GW,explaining 10.4% and 18.6% of the phenotypic variation, respectively. Three QTLs for GT were found on chromosomes 2, 5, and 7, explaining9.9%, 12.9%, and 9.9% of phenotypic variation, respectively. These QTLs offer potential applications in breeding programs using Basmati370 to develop long and slender grain japonica varieties.