A total of 286 recombinant inbred lines(RILs) and their parents,CO39 and Xiangzi 3150,were inoculated with Magnaporthe oryzae by natural inoculation for evaluation of rice field leaf-blast resistance in the blast nursery at Taojiang county.The results showed that 14 QTLs were detected in the regions exceeding 2.5 LOD.These QTLs were mapped on chromosome 3,8 and 10 respectively;accounting for 11.78%-40.57% of the phenotypic variance.QTLs responsible for different field resistance traits were tightly linked each other,or the individual putative QTL contrib...