Genetic components of maize heterotical contrasting tropical and subtropical populations.
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| Autores: | , , , |
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| Formato: | artículo original |
| Estado: | Versión publicada |
| Fecha de Publicación: | 2005 |
| Descripción: | A diallelic crossbetween 16 tropical and subtropical populations was formedat Iguala, Gro., in the winter nursery 2002 - 2003. Crossesand parents were evaluated during the 2003 growing seasonat INIFAP Bajío Experimental Station, in Celaya, Gto,Mexico. The objective was to identify the best populations tosupport the heterotic structure in our breeding program and assources to derived new inbred lines. Data were analyzedusing the Gardner and Eberhart model, in which variancecomponents can be separated to estimate additive and nonadditivegenetic effects. Results showed that despite theheterotic response involved in the formation of thepopulations, the “tropical x subtropical” heterotic pattern wasexpressed in specific combinations such PABG T x Sint “B”IG and Sint PABG I ACG x Sint “A” IG, with grain yields of12.5 and 12.4 t/ha respectively. These crosses presentedmaximum values of specific heterosis which can be used fordeveloping high-yielding hybrids through reciprocalrecurrent selection. Tropical population Sint “A” IGpresented the highest varietal effect, and because of its goodadaptation in the subtropic is considered an outstandinggermplasm to be incorporated in the Bajío Maize BreedingProgram. The best value of varietal heterosis, which is anindicator of General Combining Ability, was observed inPABG I GH “A” synthetic which can be used as tester. Moredetailed analysis will permit to take advantage of thegermplasm involved to benefit maize breeding programs. |
| País: | Portal de Revistas UCR |
| Institución: | Universidad de Costa Rica |
| Repositorio: | Portal de Revistas UCR |
| Lenguaje: | Español |
| OAI Identifier: | oai:portal.ucr.ac.cr:article/11867 |
| Acceso en línea: | https://revistas.ucr.ac.cr/index.php/agromeso/article/view/11867 |
| Palabra clave: | Heterotic patterns hybridization diallelic crosses Tropical x Subtropical germplasm. Patrones heteróticos hibridación cruzas dialélicas germoplasma tropical x subtropical. |