Figure 1.

Schematic Representation of the Evolutionary History of Wheat Species (Triticum and Aegilops).

Wild and domesticated species are represented in circles and squares, respectively. Ancestral species or unknown species are surrounded by a dotted circle, whereas species surrounded by a plain line circle are actual species. Species from which the Ha locus region has been sequenced in this study are highlighted in gray. Estimated dates for divergence, polyploidization, and domestication are taken from Feldman et al. (1995), Nesbitt and Samuel (1995), Allaby et al. (1999), Eckardt (2001), and Huang et al. (2002).