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• W2048282488 abstract "In order to understand the mechanisms of resistance of two lucerne cultivars (susceptible ‘Resistador’ and resistant ‘Lahontan’ clones) to a French biotype of Acyrthosiphon pisum Harris, several biological parameters of this aphid were investigated on sap-copied holidic diets differing either by their amino acid or sucrose concentrations or by the relative proportions of some amino acids. We recorded the quantitative influence of nutrient levels and amino acid profiles on adult survival and reproduction, as well as on larval growth and development. The differences in A. pisum performances on artificial diets may partly by explained by variable ingestion rates, but also by differences in metabolic efficiency of the ingested nutrients, which greatly depends on amino acid composition. Although holidic diet experiments partially confirm the biological assays of resistance on plants, they also point out a lack in our understanding of the factors present in the sap which are involved in phagostimulation in vivo, thus preventing a complete interpretation of observed resistance. Résumé Sur des milieux holidiques se différenciant par leur concentration en acides aminés ou en saccharose ou par leur spectre en acides aminés et copiant la sève de deux variétés de luzerne (sensible et résistante) nous avons étudié différents paramètres biologiques d'un biotype d'Acyrthosiphon pisum Harris afin de mieux comprendre les mécanismes de résistance à ce puceron. Que ce soit pour le reproduction et la survie des adultes ou pour la croissance et le développement larvaire, nous montrons l'influence spécifique de la concentration en saccharose et en acides aminés ainsi que celle du spectre en acides aminés des régimes artificiels. Ces différences de performances de A. pisum peuvent en partie être expliquées par les différences d'ingestion. Néanmoins pour des rapport saccharose/acides aminés identiques et pour des niveaux d'ingestion égaux, il existe selon les milieux de grandes différences de taux de reproduction et donc d'efficacités métaboliques. Les milieux copiant la sève de variétés sensible et résistante permettent jusqu'à présent d'expliquer une partie des observations faites sur végétal, mais démontrent que l'ignorance de certains facteurs phagostimulants présents dans la plante empêche une interprétation complète des effets observés." @default.
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• W2048282488 date "1988-10-01" @default.
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• W2048282488 title "Acyrthosiphon pisum performance in response to the sugar and amino acid composition of artificial diets, and its relation to lucerne varietal resistance" @default.
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• W2048282488 doi "https://doi.org/10.1111/j.1570-7458.1988.tb01175.x" @default.
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