Comparison of genomic locations between QTLs and functionally characterized genes within trait categories. The categories chosen for comparison were those with sufficient numbers of both functionally characterized genes and QTLs. In each panel, the x-axis represents the complete 382-Mb genome of rice, with blue vertical lines marking the chromosome boundaries. Yellow bars indicate the number of QTLs within 1-Mb intervals. Red arrows indicate the genome position of genes identified by using natural variation. Green arrows indicate the genome positions of genes isolated by using mutant or transgenic plant analysis.