Abstract:

The quantitative trait loci (QTLs) for seed setting rate were identified using F_2:3 population including 200 lines derived from a cross of indica and japonica “Milyang 23/Jileng 1” with microsatellite markers. The evaluation of seed setting rate was conducted in Beijing, Kunming, Sanya, Gongzhuling of China and Chuncheon of Korea, respectively. The value of seed setting rate and its distribution in F₃ lines and the number of detected QTL were significantly different due to different growing environments, indicating the interaction between QTL and environment significantly. The seed setting rate showed near normal or partional continuous distributions, suggesting that it was quantitative trait controlled by many genes. Fourteen QTLs were detected on chromosome 1, 2, 3, 4, 6, 7, 8, 10 and 12, which explained the observed phenotypic variance from 4.9% to 15.3%. qSSR1, qSSR2, qSSR6 and qSSR12 which were found in more than two growing environments were detected in RM1–RM259 on chromosome 1, RM263–RM6 on chromosome 2, RM340–RM30 on chromosome 6 and RM270–RM17 on chromosome 12, respectively, and explained 4.9%–8.4%，4.8%–7.2%，7.6%–10.7% and 7.4%–10.4% of observed phynotypic variation, respectively. The allelic genes of QTLs mostly coming from Jileng 1 were partial dominance or dominance or over dominance to these of Milyang 23.

Key words: Rice, Seed setting rate, Different growing environment, Quantitative trait loci (QTL), Microsatellite marker