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Root-knot nematodes (RKN) are obligate parasite species of the genus  that cause great losses in Arabica coffee ( L.) plantations. Identification of resistant genotypes would facilitate the improvement of coffee varieties aiming at an environmental friendly and costless nematode control. In this work, the  genotype ‘UFV 408-28’ was found to be resistant to the most destructive RKN species . Pathogenicity assays indicated that the highly aggressive populations of  races 1, 2 and 3 were not able to successfully reproduce on ‘UFV 408-28’ roots and displayed a low gall index (GI = 2). An average reduction of 87% reduction of the  population was observed on ‘UFV 408-28’ when compared to the susceptible cultivar ‘IAC 15’. By contrast, ‘UFV 408-28’ was susceptible to the related species  and  (GI = 5 and 4, respectively). Histological observations performed on sections of UFV408-28 roots infected with  race 1 showed that nematode infection could be blocked right after penetration or during migration and establishment stages, at 6 days, 7 days and 8 days after infection (DAI). Fluorescence and bright field microscopy observations showed that root cells surrounding the nematodes exhibited HR-like features such as accumulation of phenolic compounds and a necrotic cell aspect. In the susceptible ‘IAC 15’ roots, 6 DAI, feeding sites contained giant cells with a dense cytoplasm. Necrotic cells were never observed throughout the entire infection cycle. The HR-like phenotype observed in the ‘UFV 408-28’— interaction suggests that the coffee resistance may be mediated by a -gene based immunity system and may therefore provide new insights for understanding the molecular basis of RKN resistance in perennial crops.

Resistance to Meloidogyne incognita expresses a hypersensitive-like response in Coffea arabica