title: Why the aphid Aphis spiraecola is more abundant on clementine tree than Aphis gossypii?
abstract: Aphis spiraecola and Aphis gossypii cause harmful damages on clementine tree orchards. Weekly surveys measured the abundance of aphids (larvae, winged and wingless adults) as well as of auxiliary insects and parameters of energy metabolism. Correlatively, soluble carbohydrates, total free amino acids, free proline and condensed tannins were quantified in control and infested leaves. Both aphid species showed parallel temporal variations, but A. spiraecola was consistently more abundant regardless of the stage. Amino acids had a positive effect on both aphid species abundance, but neither condensed tannins nor auxiliary insects seemed to modulate aphid populations. Interestingly, the leaf carbohydrate content was positively correlated with the abundance of A. spiraecola, but not with that of A. gossypii. Moreover, A. gossypii's abundance was significantly down-regulated by high proline concentrations. Thus, the higher abundance of A. spiraecola could be explained by a better tolerance to high proline contents and a better conversion of foliar energy metabolites.
authors.affiliation: Zoophytiatrie Laboratory, Department of Agronomy, Faculty of Agricultural Sciences and Veterinary, University Saad Dahleb, 9000 Blida, Algeria.
authors.forename: Houda
authors.initials: H
authors.lastname: Mostefaoui
authors.affiliation: UMR 1061, INRA, Université de Limoges, 123, avenue Albert-Thomas, 87060 Limoges cedex, France.
authors.forename: Leila
authors.initials: L
authors.lastname: Allal-Benfekih
authors.affiliation: Zoophytiatrie Laboratory, Department of Agronomy, Faculty of Agricultural Sciences and Veterinary, University Saad Dahleb, 9000 Blida, Algeria.
authors.forename: Zahr-Eddine
authors.initials: ZE
authors.lastname: Djazouli
authors.affiliation: UMR 1061, INRA, Université de Limoges, 123, avenue Albert-Thomas, 87060 Limoges cedex, France.
authors.forename: Daniel
authors.initials: D
authors.lastname: Petit
authors.affiliation: Laboratory of Chemistry of Natural Substances (EA 1069), University of Limoges, 123, avenue Albert-Thomas, 87060 Limoges cedex, France. Electronic address: gaelle.saladin@unilim.fr.
authors.forename: Gaëlle
authors.initials: G
authors.lastname: Saladin
mesh_terms: D000462:Algeria; D000596:Amino Acids / Q000378:metabolism; D000818:Animals; D001042:Aphids / Q000378:metabolism / Q000502:physiology*; D050260:Carbohydrate Metabolism / Q000502:physiology; D032084:Citrus sinensis / Q000469:parasitology*; D002980:Climate; D004734:Energy Metabolism / Q000502:physiology; D050356:Lipid Metabolism / Q000502:physiology; D018515:Plant Leaves / Q000469:parasitology; D011392:Proline / Q000378:metabolism; D012044:Regression Analysis; D012621:Seasons; D013045:Species Specificity; D013634:Tannins / Q000378:metabolism
chemical_list: D000596:Amino Acids; D013634:Tannins; D011392:Proline
keywords: Aphis gossypii; Aphis spiraecola; Clementine tree; Clémentier; Metabolites; Métabolites; Proline