Journal of Economic Entomology (2008) 101, 584-591

Vincent Le Roux, Sébastien Dugravot, Erick Campan, Françoise Dubois, Charles Vincent and Philippe Giordanengo (2008)
Wild Solanum resistance to aphids: Antixenosis or antibiosis?
Journal of Economic Entomology 101 (2), 584-591
Abstract: The type (antixenosis or antibiosis) of resistance against the aphids Myzus persicae (Sulzer) and Macrosiphum euphorbiae (Thomas) was characterized for the wild tuber-bearing potatoes, Solanum chomatophilum Bitter and Solanum stoloniferum Schltdl. and Bouché through behavioral (olfactometry and electrical penetration graph) and physiological studies. In dual-choice assays, only S. stoloniferum exerted attraction to M. euphorbiae. This ruled out the possibility that plant volatiles of S. chomatophilum and S. stoloniferum may contribute to the high resistance expressed. In electrical penetration graph experiments, aphids feeding on S. stoloniferum showed increased salivation phases, whereas phloem ingestion was drastically reduced for both aphid species. Because reaching phloem elements was not delayed in both species, the resistance mechanism was phloem-located. The antixenosis exhibited by S. stoloniferum was similar on young and mature leaves. S. chomatophilum also showed phloem-located antixenosis against M. persicae. In contrast, M. euphorbiae had no difficulty to reach S. chomatophilum phloem tissues and to ingest sap. S. chomatophilum resistance against M. euphorbiae was antibiosis and only expressed in mature leaves, where a complete nymphal mortality was observed.
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Link to article at publishers website
Database assignments for author(s): Philippe Giordanengo, Charles Vincent, Sébastien Dugravot, Vincent Le Roux

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Myzus persicae	Potato (Solanum tuberosum)
	Macrosiphum euphorbiae	Potato (Solanum tuberosum)