Abstract
Root-knot nematodes (RKN) are obligate parasite species of the genus Meloidogyne that cause great losses in Arabica coffee (Coffea arabica 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 C. arabica genotype ‘UFV 408-28’ was found to be resistant to the most destructive RKN species M. incognita. Pathogenicity assays indicated that the highly aggressive populations of M. incognita 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 M. incognita 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 M. exigua and M. paranaensis (GI = 5 and 4, respectively). Histological observations performed on sections of UFV408-28 roots infected with M. incognita 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’—M. incognita interaction suggests that the coffee resistance may be mediated by a R-gene based immunity system and may therefore provide new insights for understanding the molecular basis of RKN resistance in perennial crops.
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Acknowledgements
We thank Dr M. Eira (Embrapa, Brazil) for assistance in preservation and germination of grains, and Dr. L. Villain (Cirad, France) for manuscript reviewing. This work was funded by Consórcio Brasileiro de Pesquisa e Desenvolvimento do Café, Embrapa, UCB, CNPq and CAPES-Cofecub (project Sv 555/07).
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Albuquerque, E.V.S., Carneiro, R.M.D.G., Costa, P.M. et al. Resistance to Meloidogyne incognita expresses a hypersensitive-like response in Coffea arabica . Eur J Plant Pathol 127, 365–373 (2010). https://doi.org/10.1007/s10658-010-9603-3
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DOI: https://doi.org/10.1007/s10658-010-9603-3