Variation in resistance to the root-knot nematode Meloidogyne incognita in tomato genotypes bearing the Mi gene

Autor: P. Verschave, Eric Wajnberg, M. Jacquet, Miguel Molina Martínez, Philippe Castagnone-Sereno, Michel Bongiovanni
Přispěvatelé: Vilmorin, Interactions plantes-microorganismes et santé végétale (IPMSV), Institut National de la Recherche Agronomique (INRA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS), Réponse des Organismes aux Stress Environnementaux (ROSE), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)
Jazyk: angličtina
Rok vydání: 2005
Předmět:
Zdroj: Plant Pathology
Plant Pathology, Wiley, 2005, 54 (2), pp.93-99. ⟨10.1111/j.1365-3059.2005.01143.x⟩
ISSN: 0032-0862
1365-3059
DOI: 10.1111/j.1365-3059.2005.01143.x⟩
Popis: International audience; Root-knot nematodes (Meloidogyne spp.) are among the main pathogens of tomato (Lycopersicon esculentum) worldwide. Plant resistance is currently the method of choice for controlling these pests and all the commercially available resistant cultivars carry the dominant Mi gene, which confers resistance to the three main species Meloidogyne arenaria, M. incognita and M. javanica. However the emergence of virulent biotypes able to overcome the tomato resistance gene may constitute a severe limitation to such a control strategy. To date, little was known of the possible influence of the homozygous vs heterozygous allelic state of the Mi locus, or the tomato genetic background, on the expression of the resistance. In order to test both these factors, the resistance was evaluated of a large panel of L. esculentum genotypes (selected from the Vilmorin germplasm stock collection) to seven M. incognita lines avirulent or virulent against the Mi gene. Plant resistance was estimated by counting the egg masses on the root systems after inoculation with second-stage juveniles (J2). Reproduction of the nematodes was similar or, more often, significantly higher on heterozygous tomato genotypes than on homozygous ones, suggesting a possible dosage effect of the Mi gene. Data also indicated that the tomato genetic background had a major effect on the variations observed in nematode reproduction, especially when tomato genotypes were heterozygous for the Mi gene. These results have important consequences in terms of breeding strategies and durability of the resistance conferred by the Mi gene.
Databáze: OpenAIRE
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