BONGIOVANNI , Michel

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The reproductive potential of natural and laboratory-selected Meloidogyne incognita isolates virulent against the tomato Mi resistance gene, all derived from a single egg-mass, were compared when the nematodes were inoculated on susceptible and resistant tomato. Fewer second-stage juveniles (P = 0.01) of the two virulent populations selected...

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RAPD markers were used to characterize the genetic diversity and relationships of root-knot nematodes (RKN) (Meloidogyne spp.) in Brazil. A high level of infraspecific polymorphism was detected in Meloidogyne arenaria, Meloidogyne exigua, and Meloidogyne hapla compared with the other species tested. Phylogenetic analyses showed that M. hapla...

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In pepper (Capsicum annuum L.), the resistance genes Me1 and Me3 have been shown to control the main species of root-knot nematodes, Meloidogyne spp. Here, the reactions to inoculation with Meloidogyne incognita second-stage juveniles (J2) of two resistant doubled haploid pepper lines, HDA149 and HDA330, obtained through in vitro androgenesis...

Several Meloidogyne incognita geographic populations were characterized by analysis of the restriction fragment length polymorphisms (RFLP) obtained after digestion of their total DNA and hybridization with a [s2P]-labeled probe. The probe consisted of a 1.7-kb-repeated DNA sequence, isolated from a M. incognita genomic library, that hybridized...

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SUMMARY A new Bgl II satellite DNA has been isolated, cloned and sequenced from the coffee root‐knot nematode, Meloidogyne exigua (Nematoda: Tylenchida). It is represented as tandemly repeated sequences with a monomeric unit of 277 bp. The monomers are present at approximately 17 900 copies per haploid genome, and represent about 9.7% of the...

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...

International audience

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Root-knot nematodes (RKN) are sedentary endoparasites causing severe damage to a wide variety of crops, including tomato. Among them, the parthenogenetic species Meloidogyne arenaria, M. incognita and M. javanica are of particular economic importance. The genetic diversity and relationships of 17 populations belonging to these three major...

Plant-parasitic nematodes of the genus Meloidogyne are known to reproduce either by cross-fertilization (amphimixis), facultative meiotic parthenogenesis or obligatory mitotic parthenogenesis. Among them, M. incognita, M. arenaria and M. javanica are obligatory mitotic parthenogenetic species, while M. hapla can reproduce by both...