Plant Pathology (2020) 69, 944-952
Márcia Gabriel, Stela M. Kulczynski, Marlove F.B. Muniz, Leonardo S. Boiteux and Regina M.D.G. Carneiro (2020)
Reaction of a heterozygous tomato hybrid bearing the Mi-1.2 gene to 15 Meloidogyne species
Plant Pathology 69 (5), 944-952
Abstract: Many root-knot nematode (RKN) species (Meloidogyne spp.) are polyphagous and cultivated tomato (Solanum lycopersicum ) is one of their preferential hosts, leading to significant losses. It is known that the dominant Mi-1.2 gene in tomato confers resistance to the three most important RKN species—M . incognita , M . javanica , and M . arenaria , and minor species—M . ethiopica , M . hispanica , and M . luci . However, little information is available about resistance of tomatoes carrying this gene to other tomato-infecting RKN species. In this study, resistance conferred by the Mi-1.2 gene/locus was evaluated against populations of 15 Meloidogyne species, employing tomato cultivars Santa Clara (homozygous recessive mi-1.2 /mi-1.2 , susceptible) and Debora Plus (heterozygous Mi-1.2 /mi-1.2 , resistant). Debora Plus was susceptible only to M . enterolobii and M . hapla , and was resistant to the other Brazilian populations of M . arenaria , M . ethiopica , M . exigua , M . hispanica , M . incognita , M . inornata , M . izalcoensis M . javanica , M . konaensis , M . luci , M . morocciensis , M . paranaensis , and M . petuniae . Mi-1.2 is located on tomato chromosome 6 within a cluster of seven homologous genes of the nucleotide-binding site leucine-rich repeat (NBS-LRR) family; further research is required to confirm if this multiple Meloidogyne spp. resistance phenotype is controlled exclusively by Mi-1.2 or by combined action of other closely linked genes. This evaluation of resistance of the Debora Plus cultivar to several Meloidogyne species suggests that the Mi-1.2 gene/locus may reduce losses induced by a wide range of Meloidogyne spp. Further studies using additional resistant cultivars and other populations of Meloidogyne spp. are needed to confirm these results.
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Link to article at publishers website
Database assignments for author(s): Leonardo Silva Boiteux, Regina M.D.G. Carneiro
Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host
