Extended Data Fig. 1: Geographic distribution and population structure analyses of the 1,604 inbred lines.
From: Genomic insights into historical improvement of heterotic groups during modern hybrid maize breeding
a, Geographic distribution of all resequenced inbreds according to their origin. Bar graphs show the number of inbreds released in Era I and Era II in the US and China. The orange and blue pie charts show the proportions of inbreds released in Era I and Era II, respectively. The map was drawn using the R ggmap package (http://maps.stamen.com/, map tiles by Stamen Design, under CC BY 3.0. Data by OpenStreetMap, under ODbL). b, The marginal likelihood begins to plateau at a K = 11, which was considered as the optimal number of subgroups based on the fastStructure analysis. c, Population structure of the panel analyzed from K = 2 to 15. K = 11 clearly divided the panel into eleven subgroups, including PA1, PA2, PB, Lancaster1, Lancaster2, Zi330, Iodent, Amargo, BSSS, SPT1 and SPT2.
