Abstract
The purpose of this study was to select Coffea arabica progenies for resistance to M. paranaensis in an infested coffee growing area using Henderson's mixed model methodology. Forty-one genotypes were selected at the Coffee Active Germplasm Bank of Minas Gerais, and evaluated in regard to stem diameter, number of plagiotropic branches, reaction to the nematode, and yield per plant. There was genetic variability among the genotypes studied for all the traits evaluated, and among the populations studied for yield and reaction to the nematode, indicating possibilities for obtaining genetic gains through selection in this population. There was high rate of genotypic association between all the traits studied. Coffee plants of Timor Hybrid UFV408-01 population, and F3 progenies derived from crossing Catuaí Vermelho and Amphillo MR 2161 were the most promising in the area infested by M. paranaensis.
Highlights
Among the factors that limit the growth and production process of coffee plant, species of Meloidogyne stand out
Economic losses due to root knot nematodes vary considerably depending on the species involved and their distribution (Boisseau et al 2009)
In face of the occurrence of M. paranaensis in coffee crops in the state of Minas Gerais (Castro et al 2008), and the risks of its spread, the identification of genotypes that are resistant and adapted in infested areas is of great importance in a breeding program
Summary
Among the factors that limit the growth and production process of coffee plant, species of Meloidogyne stand out. Economic losses due to root knot nematodes vary considerably depending on the species involved and their distribution (Boisseau et al 2009). M. paranaensis is considered more harmful to coffee plant due to high root damage, and may lead to plant death. In face of the occurrence of M. paranaensis in coffee crops in the state of Minas Gerais (Castro et al 2008), and the risks of its spread, the identification of genotypes that are resistant and adapted in infested areas is of great importance in a breeding program. In addition to the parasite not causing damage to the crop, the use of genetic resistance leads to reduction of nematode population density in the soil, and the possibility of economic maintenance of the crop in infested areas
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