An F2 segregation population containing 781 single plants derived from the cross between Jushuidao R1128 with giant panicles and Nipponbare,a japonica rice variety,was established to develop high-density SNP markers by the high-throughput sequencing technique and construct ultrahigh-density genetic linkage map for the QTL mapping analysis of three rice grain shape characters including grain length,width and thickness. A total of19 grain shape relevant QTLs were detected on nine chromosomes except Chromosome...