2023/12/14 by Thomas, Sophie, Boissot, Nathalie, Mistral, Pascale +3
#APHIDIDAE #APHIS GOSSYPII #CUCURBITACEAE #DURABILITY #GENETIQUE DES POPULATIONS #HOMOPTERA #PLANT INSECT RELATIONSHIPS #POPULATIONS GENETICS #RELATION PLANTE-INSECTE #SUSTAINABLE RESISTANCE #VAT GENE
paper · doi:10.17180/59je-e042
The melon aphid, Aphis gossypii, is a major pest of many crops. Molecular markers have revealed a host race organization of the species and 8 microsatellite markers have allowed the identification of 21 multilocus genotypes (MLGs) among clones collected into colonies on Cucurbits. Aphid resistance have been identified in several melon accessions; it is controlled by a major gene, Vat, and some quantitative trait loci (QTLs). We built melon populations combining different loci of resistance, in a homogenous genetic background. They were cultivated in melon producing areas with contrasted aphid populations. Then, we showed a significant effect of the Vat gene on aphid density but non effect of the QTLs. One hundred and two MLGs were attributed to 2596 collected in trials, 54 MLGs were observed only once, five MLGs were only observed in the French West Indies, 19 MLGs were observed both in South eastern and South western France. Nevertheless, we did not observe a significant effect of the resistance loci on the diversity index of Shanon. Among clones collected into 125 colonies, we only identified 10 MLGs, five out of them were identified in clones collected on Vat-melon. The resistance loci might have an effect on the diversity of the South-eastern populations.