| Título: | Formation of heterotic groups and understanding genetic effects in a provitamin a biofortified maize breeding program |
| Autores: |
Suwarno, W.B. Pixley, K.V. Palacios-Rojas, N. Kaeppler, S.M. Babu, R. |
| Fecha: |
2014-03-05 2014-03-05 2014 |
| Publicador: | https://www.crops.org/publications/cs/pdfs/54/1/14 |
| Fuente: |
Ver documento |
| Tipo: | Journal article |
| Tema: |
Maize Corn Biofortification Vitamin A Molecular Markers Genetic distance Heterotic groups Combining ability Maize Breeding |
| Descripción: |
Developing biofortified maize cultivars is a viable approach to combat the widespread problem of vitamin A deficiency among people for whom maize is a staple food. To enhance CIMMYT's provitamin A maize breeding efforts, this study: 1) evaluated whether separation of experimental maize lines into groups based on maximizing their molecular-marker-based genetic distances (GD) resulted in heterosis for among-group crosses, 2) assessed genetic effects (general and specific combining ability, GCA and SCA) for grain yield and provitamin A concentrations in hybrids among 21 inbred lines representing the three proposed groups, and 3) assessed the association between grain yield and provitamin A concentrations. The lines were crossed following a partial diallel design resulting in 156 hybrids which were evaluated at four environments with two replications of one-row plots. The first plant in each plot was self-pollinated to produce grain for provitamin A analysis. Significant but small yield advantage of among versus within group crosses (0.47 Mg ha-1 21 , P concentration, indicating that both traits could be improved simultaneously. |
| Idioma: | English |