Recurrently Selection Breeding Populations
The populations are the result of over 30 years of population development and improvement by the University of Guelph corn breeding program. The populations in Table 1 have been assigned Plant Introduction numbers and are part of the USDA's Germplasm Resource Information Network (GRIN). Seed for the populations in Table 1 can be obtained from the GRIN system, however the University of Guelph does request that any user of these population enter into a germplasm use agreement with the university.
Grain yield, maturity and standability have been the primary focus of the Guelph population improvement program. The populations described have all undergone various methods of recurrent selection and are developed for short-season environments [< 2800 OCHU]. Unless otherwise stated, selection was based on a performance index (PI) of grain yield/grain moisture.
12 of these populations have been evaluated as population crosses.
Table 1.
Thirty-eight maize (Zea mays L.) breeding populations developed at the University of Guelph for short-season environments. Recurrent selection methods for population improvement were selfed progeny (S), half-sib (HS), reciprocal recurrent selection (RRS), combined S and RRS, or mass selection (M).
| Population | Plant introduction number | Recurrent selection method | Cycle of selection |
| CG-SynA | 613059 | - | 0 |
| 613060 | S | 7 | |
| 613061 | HS | 18 | |
| 613062 | RRS | 6 | |
| CG-SynB | 613063 | S | 7 |
| 613064 | HS | 18 | |
| CG-SynC | 613065 | S | 3 |
| CG-Wigor | 613066 | - | 0 |
| 613067 | S | 3 | |
| 613068 | RRS | 7 | |
| CG-HOPE Elite A | 613069 | RRS | 6 |
| CG-HOPE Elite B | 613070 | RRS | 6 |
| CG-Stiff Stalk | 613071 | - | 0 |
| 613072 | RRS | 5 | |
| 613073 | S | 5 | |
| 613074 | combined S & RRS | 4 | |
| CG-Lancaster | 613075 | - | 0 |
| 613076 | RRS | 5 | |
| 613077 | S | 5 | |
| 613078 | combined S & RRS | 4 | |
| CG-CBI | 613079 | RRS | 5 |
| CG-CBII | 613080 | RRS | 5 |
| CG-CCGP | 613081 | - | 0 |
| CG-CCGP A | 613082 | RRS | 3 |
| CG-CCGP B | 613083 | RRS | 3 |
| CG-SynGA | 613084 | - | 0 |
| CG-SynGB | 613085 | - | 0 |
| CG-Schindelmeiser | 613086 | S | 4 |
| Populations crossed to CG-SynA-NL | |||
| OhS4 (S) C1 | 613087 | M for earliness | 5 |
| OhS3 (S) C1 | 613088 | M for earliness | 4 |
| BS2 | 613089 | M for earliness | 4 |
| BS16 | 613090 | M for earliness | 4 |
| Mexican Dent | 613091 | M for earliness | 4 |
| Cateto Flint | 613092 | M for earliness | 4 |
| Populations from Gerrish | |||
| Coroico Flour | 613093 | M for earliness | 4 |
| Cuzco Flour | 613094 | M for earliness | 4 |
| Cateto Flint | 613095 | M for earliness | 4 |
| Caribbean Flint | 613096 | M for earliness | 8 |