FIGURE 2.

Non-random association between QTLs mapped in sorghum, and introgression from S. bicolor into S. halepense. Sorghum chromosomes (units are megabases), annotated with physical locations of hotspots of introgression from S. bicolor into S. halepense [black (Morrell et al., 2005)] and QTLs for seed lutein concentration [green (Fernandez et al., 2008)], seedling vigor [orange (Fernandez et al., 2008)], and rhizomes [blue (Zhang et al., 2013)]. NCED3 and CYP707A4 are gene candidates for cold tolerance (see text). Internal lines indicate syntenic duplicated genes persisting from whole-genome duplication ∼96 million years ago (Paterson et al., 2009; Wang et al., 2015).