Fig. 4

An unrooted neighbor-joining tree showing the genetic relationships between the 190 rice accessions, with the upland varieties shown as narrow lines and the irrigated lowland varieties as heavy lines. Seven control varieties are labeled (Nipponbare, Azucena, IR64, Kasalath, and three Indonesian varieties previously studied: Popot, Ketan Siam, and Kantul), along with several varieties showing indica/japonica admixture and a cluster of irrigated japonica landraces. Out of the 147 japonica landraces, 126 were upland, while out of 36 indica landraces only two were upland varieties. Note that sets of identical varieties are shown by a single line.