Table 1. Tuxpeño core and diverse germplasm used for genotyping.
| Germplasm category | Origins of germplasm (country or state in Mexico) | Number of accessions |
| Tuxpeño core (landrace collection and populations) | Veracruz | 74 |
| San Luis Potosi | 57 | |
| Chiapas | 50 | |
| Tamaulipas | 23 | |
| Guatemala | 22 | |
| Nayarit | 20 | |
| Sinaloa | 11 | |
| Hidalgo | 7 | |
| Jalisco | 7 | |
| Nuevo Leon | 6 | |
| Other states and countries | 44 | |
| GEM recommended lines (SS/NSS)* | U.S. | 54 |
| CML: CIMMYT maize lines (A/B)* | CIMMYT | 94 |
| U.S. landraces (Southern and Corn Belt Dent) | U.S. | 14 |
| CIMMYT populations: breeding populations and single crosses | CIMMYT | 11 |
| Temperate inbreds | U.S. | 3 |
| China | 1 | |
| Total | 498 |
*
GEM SS: stiff stalk synthetic heterotic group; GEM NSS: non-stiff stalk synthetic heterotic group; CML-A: CIMMYT maize line of heterotic group A; CML-B: CIMMYT maize line of heterotic group B.