Location of the Mechanism of Resistance to Amphorophora agathonica (Hemiptera: Aphididae) in Red Raspberry Public Deposited

http://ir.library.oregonstate.edu/concern/defaults/n009w288x

This is the publisher’s final pdf. The article is copyrighted by the Entomological Society of America. It can be found at:  http://www.entsoc.org/Pubs/Periodicals/JEE. To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work.

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  • The aphid Amphorophora agathonica Hottes (Hemiptera: Aphididae) is an important virus vector in red (Rubus idaeus L.) and black (Rubus occidentalis L.) raspberries in North America. Raspberry resistance to A. agathonica in the form of a single dominant gene named Ag1 has been relied upon to help control aphid-transmitted plant viruses; however, the mechanism of resistance to the insect is poorly understood. Aphid feeding was monitored using an electrical penetration graph on the resistant red raspberry `Tulameen' and compared with a susceptible control, `Vintage'. There were no differences in pathway feeding behaviors of aphids as they moved toward the phloem. Once in the phloem, however, aphids feeding on resistant plants spent significantly more time salivating than on susceptible plants, and ingested significantly less phloem sap. This suggests that a mechanism for resistance to A. agathonica is located in the phloem. Reduced ingestion of phloem may result in inefficient acquisition of viruses and is a likely explanation for the lack of aphid-transmitted viruses in plantings of resistant cultivars.
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  • Lightle, D. M., Dossett, M., Backus, E. A., & Lee, J. C. (2012). Location of the mechanism of resistance to amphorophora agathonica (hemiptera: Aphididae) in red raspberry. Journal of Economic Entomology, 105(4), 1465-1470. doi: 10.1603/EC11405
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