Lima E. A. auteur aut IRD Furlanetto C. auteur aut IRD Nicole Michel auteur aut IRD Gomes A. C. M. M. auteur aut IRD Almeida M. R. A. auteur aut IRD Jorge A. auteur aut IRD Correa V. R. auteur aut IRD Salgado S. M. auteur aut IRD Ferrao M. A. G. auteur aut IRD Carneiro R. M. D. G. auteur aut IRD text journalArticle eng text/pdf born digital access Root-knot nematodes (RKN), Meloidogyne spp., have major economic impact on coffee production in Central and South America. Genetic control of RKN constitutes an essential part for integrated pest management strategy. The objective of this study was to evaluate the resistance of Coffea canephora genotypes (clones) to Meloidogyne spp. Sensitive and drought-tolerant coffee genotypes were used to infer their resistance using nematode reproduction factor and histopathology. Eight clonal genotypes were highly resistant to M. paranaensis. 'Clone 14' (drought-tolerant) and 'ESN2010-04' were the only genotypes highly resistant and moderately resistant, respectively, to both M. incognita races 3 and 1. Several clones were highly resistant to both avirulent and virulent M. exigua. Clone 14 and ESN2010-04 showed multiple resistance to major RKNs tested. Roots of 'clone 14' (resistant) and 'clone 22' (susceptible) were histologically studied against infection by M. incognita race 3 and M. paranaensis. Reduction of juvenile (J2) penetration in clone 14 was first seen at 2 to 6 days after inoculation (DAI). Apparent early hypersensitive reaction (HR) was seen in root cortex between 4 and 6 DAI, which led to cell death and prevention of some nematode development. At 12 to 20 DAI, giant cells formed in the vascular cylinder, besides normal development into J3/J4. From 32 to 45 DAI, giant cells were completely degenerated. Late, intense HR and cell death were frequently observed around young females and giant cells reported for the first time in coffee pathosystem. These results provide rational bases for future studies, including prospection, characterization, and expression profiling of genomic loci involved in both drought tolerance and resistance to multiple RKN species. specialized AMERIQUE CENTRALE AMERIQUE DU SUD 076 105 6 805-814 2015 0031-949X https://www.documentation.ird.fr/hor/fdi:010064755 10.1094/phyto-08-14-0232-r 0031-949X [F B010064755] https://www.documentation.ird.fr/hor/fdi:010064755 https://www.documentation.ird.fr/intranet/publi/2015/07/010064755.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2015-07-29 2017-08-23 fdi:010064755 fre