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Wild Solanum Resistance to Aphids: Antixenosis or Antibiosis?

Author

Listed:
  • Vincent Le Roux

    (BIOPI - Biologie des Plantes et Innovation - UR UPJV 3900 - UPJV - Université de Picardie Jules Verne)

  • Sébastien Dugravot

    (BIO3P - Biologie des organismes et des populations appliquées à la protection des plantes - INRA - Institut National de la Recherche Agronomique - UR - Université de Rennes - AGROCAMPUS OUEST)

  • Erick Campan

    (UT3 - Université Toulouse III - Paul Sabatier - UT - Université de Toulouse)

  • Françoise Dubois

    (BIOPI - Biologie des Plantes et Innovation - UR UPJV 3900 - UPJV - Université de Picardie Jules Verne)

  • Charles Vincent

    (CRDH - Centre de Recherche et de Développement en Horticulture - Agriculture et Agroalimentaire Canada)

  • Philippe Giordanengo

    (BIOPI - Biologie des Plantes et Innovation - UR UPJV 3900 - UPJV - Université de Picardie Jules Verne)

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. & 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.

Suggested Citation

  • Vincent Le Roux & Sébastien Dugravot & Erick Campan & Françoise Dubois & Charles Vincent & Philippe Giordanengo, 2008. "Wild Solanum Resistance to Aphids: Antixenosis or Antibiosis?," Post-Print hal-02667231, HAL.
    • Handle: RePEc:hal:journl:hal-02667231
    DOI: 10.1603/0022-0493(2008)101[584:WSRTAA]2.0.CO;2
    as

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