Production of semiochemical and allelobiotic agents as a consequence of aphid feeding |
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Authors: | Sarah Y Dewhirst John A Pickett |
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Institution: | 1. Centre for Sustainable Pest and Disease Management, Chemical Ecology Group, Biological Chemistry Department, Rothamsted Research, Harpenden, Hertfordshire, AL5 2JQ, UK
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Abstract: | Aphids have an extremely intimate relationship with their plant hosts. Although this might suggest that aphid infestation
would be largely cryptic, there are a wide range of changes that can be detected behaviourally, chemically and also at the
molecular genetic level. Colonisation by aphids can cause release of semiochemicals characteristic of the aphid species and
besides reducing acceptability to incoming aphids; these can enable recruitment of specific parasitoids. Some semiochemicals
involved in these processes can also influence the defence status of neighbouring intact plants through air or the rhizosphere.
Electrophysiological and behavioural studies on the aphids, their parasitoids and other organisms facilitate the identification
of compounds having direct effects on plant defence. New developments from work on semiochemicals such as (Z)-jasmone and 6-methyl-5-hepten-2-one, and allelobiotic agents such as 6-hydroxy-1,2,3,4-tetrahydro-β-carboline-3-carboxylic
acid and 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one, as well as new work on these compounds and others as potential phytopheromones
are discussed. |
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