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Host genetic resistance to root-knot nematodes, Meloidogyne spp., in Solanaceae: from genes to the field

Abstract : Root-knot nematodes (RKNs) heavily damage most solanaceous crops worldwide. Fortunately, major resistance genes are available in a number of plant species, and their use provides a safe and economically relevant strategy for RKN control. From a structural point of view, these genes often harbour NBS-LRR motifs and are organized in syntenic clusters in solanaceous genomes. Their introgression from wild to cultivated plants remains a challenge for breeders, although facilitated by marker-assisted selection. As shown with other pathosystems, the genetic background into which the resistance genes are introgressed is of prime importance on both the expression of the resistance and its durability, as exemplified with the recent discovery of QTLs conferring quantitative resistance to RKNs in pepper. The deployment of resistance genes at a large scale may result in the emergence and spread of virulent nematode populations able to overcome them, as already reported in tomato and pepper. Therefore, careful management of the resistance genes available in solanaceous crops is crucial to avoid significant reduction of the duration of the RKN genetic control in the field. From that perspective, only rational management combining breeding and cultivation practices will allow the design and implementation of innovative, sustainable crop production systems that protect the resistance genes and maintain their durability
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Submitted on : Wednesday, May 27, 2020 - 7:53:52 AM
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Arnaud Barbary, Caroline Djian-Caporalino, Alain Palloix, Philippe Castagnone-Sereno. Host genetic resistance to root-knot nematodes, Meloidogyne spp., in Solanaceae: from genes to the field. Pest Management Science, Wiley, 2015, 71 (12), pp.1591-1598. ⟨10.1002/ps.4091⟩. ⟨hal-02631345⟩



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