In this research,recombinant inbred lines(RILs) derived from Zhaxima,a landrace indica variety of Yunnan province and Nanjing 46,an elite japonica variety with superior grain quality of Jiangsu province were used.A molecular linkage map consisting of 202 SSR markers was constructed.Grain shape related traits including grain length,grain width,grain length-width ratio and grain thickness were investigated in the RIL population.Combined with the linkage map,a total of 17 additive QTL affecting grain shape wer...