In silico comparative mapping of barley genes to the rice genome sequence. (A–F) Barley chromosomes 2H, 3H, 4H, 5H, 6H, and 7H, respectively. Bars with light and dark shading represent single- and multiple-copy transcripts, respectively. Genomic synteny of barley chromosomes to rice chromosomes is as follows: barley 2H to rice 4 and 7; barley 3H to rice 1; barley 4H to rice 3 and 11; barley 5H to rice 3, 9, and 12; barley 6H to rice 2; and barley 7H to rice 6 and 8 (Van Deynze et al. 1995; Gale and Devos 1998). The transcript number shown in each rice chromosome represents the total number of rice genes found to be homologous to barley sequences by BLASTN (E < e−10) search using the rice genome database (http://riceblast.dna.affrc.go.jp/cgi-bin/robo-blast/blast2.cgi?dbname=all).