| Title: | Proteomic profiling of aphid Macrosiphum euphorbiae responses to host-plant-mediated stress induced by defoliation and water deficit |
| Author(s): | An Nguyen TT; Michaud D; Cloutier C; |
| Address: | "Departement de Biologie, Universite Laval, Quebec, Canada" |
| DOI: | 10.1016/j.jinsphys.2007.02.018 |
| ISSN/ISBN: | 0022-1910 (Print) 0022-1910 (Linking) |
| Abstract: | "Abiotic and biotic host-plant stress, such as desiccation and herbivory, may strongly affect sap-sucking insects such as aphids via changes in plant chemicals of insect nutritional or plant defensive value. Here, we examined (i) water deprivation and (ii) defoliation by the beetle Leptinotarsa decemlineata as stresses indirectly affecting the aphid Macrosiphum euphorbiae via its host plant Solanum tuberosum. For plant-induced stress, aphids were reared on healthy vs. continuously stressed potato for 14 days (no watering; defoliation maintained at approximately 40%). Aphid performance under stress was correlated with metabolic responses monitored by profiling of the aphid proteome. M. euphorbiae was strongly affected by water stress, as adult survival, total aphid number and biomass were reduced by 67%, 64%, and 79%, respectively. Aphids performed normally on defoliated potato, indicating that they were unaffected or able to compensate any stress induced by plant defoliation. Stressed aphid proteomes revealed 419-453 protein spots, including 27 that were modulated specifically or jointly under each kind of host-plant stress. Reduced aphid fitness on water-stressed plants mostly correlated with modulation of proteins involved in energy metabolism, apparently to conserve energy in order to prioritize survival. Despite normal performance, several aphid proteins that are known to be implicated in cell communication were modulated on defoliated plants, possibly suggesting modified aphid behaviour. The GroEL protein (or symbionin) of the endosymbiont Buchnera aphidicola was predominant under all conditions in M. euphorbiae. Its expression level was not significantly affected by aphid host-plant stresses, which is consistent with the high priority of symbiosis in stressed aphids" |
| Keywords: | "Animals Aphids/growth & development/*metabolism Coleoptera/growth & development Discriminant Analysis Electrophoresis, Gel, Two-Dimensional Insect Proteins/analysis/*metabolism Plant Diseases/*parasitology Proteomics/*methods Solanum tuberosum Water/metab;" |
| Notes: | "MedlineAn Nguyen, Thi Thuy Michaud, Dominique Cloutier, Conrad eng Research Support, Non-U.S. Gov't England 2007/05/01 J Insect Physiol. 2007 Jun; 53(6):601-11. doi: 10.1016/j.jinsphys.2007.02.018. Epub 2007 Mar 12" |
