Fig. 2.

Patterns of colinearity between sorghum and rice. The x axis represents 45,174 rice genes in their chromosomal order, and the y axis represents 2,509 loci in their recombinational arrangement along a sorghum STS-based genetic map (1). Rice chromosomes (1-12) and sorghum linkage groups (A-J) are arranged consecutively, and labeled at top and left, respectively. Red circles represent inferred locations of sorghum centromeres (1). Each dot represents a best match (≤1e-06) between a sorghum STS and a rice gene. The total number of probes mapping to each intersection of sorghum and rice chromosomes is shown at upper left in each cell. Horizontal subdivisions of sorghum linkage groups B, C, and F delineate locations at which sorghum-rice syntenic relationships change, consistent with subdivisions of the counts of incongruent loci shown in Table 2.