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Article Dans Une Revue Plant Pathology Année : 2017

Genetic variability of Meloidogyne paranaensis populations and their aggressiveness to susceptible coffee genotypes

Résumé

Meloidogyne paranaensis is one of the most destructive root-knot nematode (RKN) species parasitizing coffee in Braziland in the Americas generally. The objectives of this study were to assess the genetic variability, aggressiveness and vir-ulence of seven different M. paranaensis populations on susceptible and resistant Coffea spp. All seven RKN popula-tions were identified by biochemical and molecular methods. Coffee seedlings were inoculated in the greenhouse, andthe nematode reproduction factor was used to infer their reproduction on coffee genotypes. Phylogenetic studiesshowed a low genetic variability in M. paranaensis populations, regardless of the existence of three esterase phenotypes(Est P1, P2 and P2a), except for the population Est P2a from Guatemala, which is genetically different from otherM. paranaensis populations from Brazil. The Est P2a and Est P2 (Hercul^andia, SP, Brazil) populations were the mostaggressive on two susceptible C. arabica cultivars under greenhouse conditions. None of the M. paranaensis popula-tions were virulent on resistant coffee genotypes, confirming their resistance to the seven M. paranaensis populationstested. The resistant coffee cultivars, namely Clone 14 INCAPER, Catua ı Vermelho 9 Amphillo MR2161 (E1 16-5III), Apoat~a IAC 2258, Timor Hybrid UFV 408-01 (E1 6-6 II) and IPR 100, exhibited segregation for resistance in theratio of 0%, 2.4%, 12%, 26% and 29%, respectively. These are promising results, because they validate resistanceagainst several M. paranaensis populations in different Coffea spp. genetic resources, which can be used in breedingprogrammes or as rootstocks, such as Apoat~a IAC 2258 and Clone 14 INCAPER.

Dates et versions

hal-01605137 , version 1 (02-10-2017)

Identifiants

Citer

M. F. A. Santos, V. R. Correa, J. R. Peixoto, V. S. Mattos, J. G. P. Silva, et al.. Genetic variability of Meloidogyne paranaensis populations and their aggressiveness to susceptible coffee genotypes. Plant Pathology, 2017, 67, ⟨10.1111/ppa.12718⟩. ⟨hal-01605137⟩
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