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The aim of this work was to evaluate the reaction of IPR 100 derived Arabica coffee lines to the nematode Meloidogyne paranaensis and to investigate the association between the parameters used to select resistant genotypes. The experiment was carried out in a greenhouse at IAPAR in Londrina PR, Brazil. The resistance to M. paranaensis of nineteen Coffea arabica F3 lines derived from the cross “PRFB E9705-9” × ‘IPR 100’ and three from the cross ‘IPR 100’ × “Sarchimor E9601 III-19-1” were assessed. Plants with three to four pairs of leaves were inoculated with 5000 M. paranaensis eggs and J2 juveniles. After 90 days of inoculation, the variables reproduction factor (RF), fresh weight of roots (FWR) and number of eggs and J2 juveniles per gram of roots (Nematodes.g ) were assessed. Reduction in the reproduction factor (RRF) and host susceptibility index (HSI) were used to classify the resistant levels. Resistant lines were identified and the use of RRF, HSI and RF indices together helped to identify genotypes with resistance to nematodes. In the present study, statistical difference between the FWR of the genotypes was observed. Thus, if the indices are used alone, it is likely that HSI is better, since it can minimize possible interference in the classifications due to differences between the root volumes of the assessed genotypes. The percentage of plants with different resistance levels based on the classification of RRF and HSI and percentage of resistant plants based on RF are useful to identify homozygous and heterozygous genotypes. Keyword: coffee, breeding, homozygous resistant, root-knot nematodes. Abbreviations: IP_initial population; FP_final population; RF_reproduction factor; J2_second stage juveniles; Nematodes_number of eggs and J2; FWR_fresh weight of roots; Nematodes.g_number of eggs and second stage juveniles per gram of roots; RL_resistance levels; RRF_reduction in the reproduction factor; HSI_host susceptibility index; HS_highly susceptible; S_susceptible; MS_moderately susceptible; MR_moderately resistant; R_resistant; HR_highly resistant; % PRL_percentage of plants with different resistance levels; %RP_percentage of resistant plants.

Coffea arabica lines with resistance to nematode Meloidogyne paranaensis derived from crossings with IPR 100