Resumen

BARRIENTOS¹, Venancio; BORGES², Orángel; SAN VICENTE³, Félix  y  GARRIDO4, Mario José. Inheritance of resistance to the venezuelan maize dwarf mosaic virus in maize lines . INCI [online]. 2006, vol.31, n.3, pp.202-205. ISSN 0378-1844.

Summary The incidence of the Venezuelan strain of the Maize Dwarf Mosaic Virus (MDMV-V) has increased since 1970 in experimental and commercial fields of sorghum (Sorghum bicolor) and maize (Zea mays). MDMV-V is the most important virus in Venezuela’s maize areas, with a high incidence. The aim of this study was to determine the mode of inheritance of the resistance to MDMV-V and the relative importance of the genetic effects in a set of maize inbred lines. The resistant inbreeds CML-49, CML-161 and CML-264 were crossed with the susceptible CML-247 and the corresponding F2 populations and backcrosses to the susceptible and resistant parents were obtained. All generations were evaluated in a randomized complete-block design with four replications. The experimental unit consisted of 50 plants for the susceptible and resistant parent and the F₁ generation, 100 plants for backcrosses, and 400 plants for the F₂ generations. The genetic analysis of resistance based on one or two genes did not fit the segregating ratios observed in the F₂ and backcross populations, suggesting a more complex inheritance mode for resistance to the MDMV-V. The analysis of generation means revealed that genetic variation for virus resistance was best explained by an additive-dominant model, where the additive effects were the most important ones

Palabras clave : Herencia; Maíz; MDMV-V; Resistencia; Virus.