Fig. 2.

Classification of 60 Formosan upland rice accessions and 4 control varieties using STRUCTURE v2.3.1 with K set at 3. Panel a. Population 1 (red) primitive japonica; population 2 (green): relatively modern japonica; population3 (blue): indica. Numbers above the main graph identify accessions discussed in the text: 1, Nakairitsu; 2, Kabotsumame; 3, Matara; 4, Chuan No4; 5, Bohai; 6, Purahaitairin; 7, Montana; 8, Nipponbare; 9, Nakabo; 10, Muteka; 11, Ragarasu; 12, Tangengenrankatsu; 13, Tapopuri; 14, IR64; 15, Nobohai; 16, Parahainakoru. Panel b. Degree of awn length (blue; white indicates no awn) and seed shattering (red; white indicates no shattering) of each accession. The list of accessions is shown in Additional file 1: Table S4, and the seeds are available at National Germplasm Center, Taiwan Agriculture Research Institute, Taiwan and T.T. Chang Germplasm Center, International Rice Research Institute, the Philippines