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Three aphid-transmitted viruses encourage vector migration from infected common bean (Phaseolus vulgaris) plants through a combination of volatile and surface cues

Wamonje, Francis O., Tungadi, Trisna D., Murphy, Alex M., Pate, Adrienne E., Woodcock, Christine, Caulfield, John C., Mutuku, J. Musembi, Cunniffe, Nik J., Bruce, Toby J. A., Gilligan, Christopher A., Pickett, John A. and Carr, John P. 2020. Three aphid-transmitted viruses encourage vector migration from infected common bean (Phaseolus vulgaris) plants through a combination of volatile and surface cues. Frontiers in Plant Science 11 , 613772. 10.3389/fpls.2020.613772

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Abstract

Bean common mosaic virus (BCMV), bean common mosaic necrosis virus (BCMNV), and cucumber mosaic virus (CMV) are important pathogens of common bean (Phaseolus vulgaris), a crop vital for food security in sub-Saharan Africa. These viruses are vectored by aphids non-persistently, with virions bound loosely to stylet receptors. These viruses also manipulate aphid-mediated transmission by altering host properties. Virus-induced effects on host-aphid interactions were investigated using choice test (migration) assays, olfactometry, and analysis of insect-perceivable volatile organic compounds (VOCs) using gas chromatography (GC)-coupled mass spectrometry, and GC-coupled electroantennography. When allowed to choose freely between infected and uninfected plants, aphids of the legume specialist species Aphis fabae, and of the generalist species Myzus persicae, were repelled by plants infected with BCMV, BCMNV, or CMV. However, in olfactometer experiments with A. fabae, only the VOCs emitted by BCMNV-infected plants repelled aphids. Although BCMV, BCMNV, and CMV each induced distinctive changes in emission of aphid-perceivable volatiles, all three suppressed emission of an attractant sesquiterpene, α-copaene, suggesting these three different viruses promote migration of virus-bearing aphids in a similar fashion.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Publisher: Frontiers Media
ISSN: 1664-462X
Date of First Compliant Deposit: 14 December 2020
Date of Acceptance: 14 December 2020
Last Modified: 15 Dec 2020 10:45
URI: http://orca.cardiff.ac.uk/id/eprint/136995

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