Herencia de la resistencia al complejo Cercospora spp. en líneas de maíz tropical
Inheritance of resistance to Cercospora Complex in tropical maize (zea mays) inbred lines. Inheritance of resistance to the maize disease complex caused by Cercospora spp on tropical maize was studied by generating and evaluating a diallel mating model (Griffing model I) using ten corn inbred lines with contrasting levels of disease reaction (5 tolerant and 5 susceptible). Parental lines and their crosses, both direct and reciprocal, were evaluated in three locations using conservation tillage and inoculated artificially with inoculum prepared using a mixture of foliar maize diseases collected from several farmer’s fields. Analysis of variance for the variable index of disease (scale 1 to 5), both locality and combined, the general combining ability (hcg), specific combining ability (hce), and reciprocal effects were highly significant, with the hcg portion being >10 times greater than the hce component, indicating that the genetic action is predominantly additive. Data collected suggested that maternal or cytoplasmic effects are important in controlling disease resistance. Accumulation of resistance genes through the development of synthetic varieties is an alternative to be implemented in maize breeding programs workin towards the development of gray leaf spot resistant tropical maize germplasm.
| Main Authors: | , , |
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| Format: | Digital revista |
| Language: | spa |
| Published: |
Universidad Nacional de Colombia - Sede Palmira
2005
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| Online Access: | https://revistas.unal.edu.co/index.php/acta_agronomica/article/view/116 |
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