Table 1. Regional distribution of the total collection and the core set in this study.
| Collection region | Group | Number of core sets | ||
|---|---|---|---|---|
| Group 1 | Group 2 | Group 3 | ||
| Africa | 1 | 0 | 5 | 1 |
| Anhui | 3 | 0 | 0 | 0 |
| Beijing | 1 | 0 | 2 | 0 |
| Chongqing | 7 | 0 | 4 | 2 |
| Fujian | 0 | 3 | 8 | 2 |
| Guangdong | 0 | 47 | 5 | 8 |
| Hainan | 0 | 3 | 0 | 2 |
| Hebei | 3 | 0 | 4 | 2 |
| Henan | 7 | 2 | 6 | 2 |
| Hubei | 1 | 3 | 4 | 3 |
| Hunan | 2 | 0 | 0 | 0 |
| Japan | 0 | 0 | 2 | 0 |
| Jiangsu | 11 | 1 | 4 | 4 |
| South Korea | 0 | 0 | 8 | 1 |
| Shanxi | 1 | 0 | 2 | 1 |
| Shandong | 9 | 0 | 11 | 1 |
| Sichuan | 7 | 2 | 10 | 8 |
| Taiwan | 0 | 1 | 0 | 0 |
| Thailand | 0 | 0 | 1 | 1 |
| USA | 0 | 0 | 2 | 0 |
| Zhejiang | 1 | 1 | 2 | 1 |
| Total | 54 | 63 | 80 | 39 |