| Rice (Oryza sativa L.) is one of the most important farm crop food of the world. The yield of paddy rice occupies 40% above of the yield of national farm crop, 40% or so of the total yield of world paddy rice. Analysis of quantitative trait loci (QTLs) was carried out based on the molecular linkage map constructed from the RIL population. Different QTLs were identified for heading date, plant height, panicle length, flag leaf length, and flag leaf width. They collectedly explained 50.6%,74.9%,34.1%,47.3% and 46% of phenotypic variations for these traits. Of the mapped QTLs, gene Hd26, Ph27 and Fll-b2 controlling heading date, plant height and flag leaf length were major loci located on chromosome 6, 7 and 2, respectively. QTLs controlling the related agronomic traits were often mapped on the same or adjacent intervals, forming several clusters in rice chromosomes. The important agronomic trait loci were identified and analyzed can provide useful genetic information, which is used as molecular marker-aided selection in breeding program of B5.The tiller number of the parents and RILs were evaluated every 4 days from the 15th day after transplanting. Four main-effect QTLs contributing to tiller number in crease were detected that expressed in different time intervals. These QTLs were located on the chromosomes 2, 5, 8 and 9. Seventeen pairs of epistatic loci were detected too. The digenic epistasis showed relatively high effect in several time intervals, which suggests a multigene network controlling the tillering ability of rice.
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