PIOTTE , Christine

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Chez le melon, il existe une résistance, conférée par le gène Vat 2 , à la colonisation par le puceron Aphis gossypii. Cette résistance s'exprime d'une part par une antixénose 3 et d'autre part par une antibiose 4 . Des variétés possédant ce gène sont commercialisées depuis plus de 10 ans, et on peut donc craindre le développement de pucerons...

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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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In agrosystems, pests are submitted to strong human-imposed selective pressures to which they sometimes adapt rapidly, either through selection of genotypes resulting from mutation and/or recombination events, or through phenotypic plasticity. Understanding how insects respond to such selective pressures is of great importance for sustainable...

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...