Figure 5.

The phylogenetic tree for 150 soybean cultivars. The branch colours represent the countries of origin. The cultivation regions are represented by different symbols of the branches: the solid triangle represents Northern Region of China (NR), the solid circle represents Huanghuaihai Region of China (HR), the solid square represents Southern Region (SR) of China and the square with a cross inside represents other regions (the regions are out of China). The latitudes of the origins of cultivars are indicated by the ring in the outer layer, and the diverse colours represent the latitude degrees (°).