Figure 1.

A consensus grass comparative map. The comparative data have been drawn from many sources: Oats-wheat-maize-rice (8); wheat-rice (6, 30), and unpublished data; maize-rice (5, 10); maize-wheat (7); maize-sorghum-sugarcane (10, 11); and foxtail millet-rice (9). Arrows indicate inversions and transpositions necessary to describe present-day chromosomes. Locations of telomeres (▵) and centromeres (□) are shown where known. Hatched areas indicate chromosome regions for which very little comparative data exist. Chromosome nomenclatures and arm (short/long or top/bottom) designations are as described by O’Donoughue et al. (31) for oats, Pereira et al. (32) for sorghum, Dufour (11) for the sugarcane genomes, Wang et al. (33) in foxtail millet, and Singh et al. (34) in rice.