60.アブラムシの天敵を誘引する植物の揮発性物質生産の分子機構(口頭発表)

概要

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Plants defend themselves against herbivores, either directly or indirectly. The production of plant volatiles in response to herbivory (herbivore-induced plant volatiles: HIPV) that attract carnivorous natural enemies of the infesting herbivores can be regarded as 'induced indirect defenses'. In the production of HIPV, chemical compounds of herbivore origin (so called "elicitors") have been shown to play an important role. To date, such elicitors have been found in regurgitant of several Lepidopteran insects. We investigated the mechanisms involved in the interaction between plants and phloem-feeding insects whose elicitors have not been reported. We have been using the study system, Vicia faba-Acyrthosiphon pisum-Aphidius ervi, and found that the parasitoid A. ervi preferred odor from V. faba infested by the host aphids A. pisum (PHC; Plant-Host Complex). We conducted choice tests of A. ervi using plants treated with saliva collected from the host and nonhost aphids, Aphis crassivora, in liquid diet. The odor from V. faba treated with saliva from host aphid origin was preferred by the wasps over odor from V. faba treated with diet only, whereas the odor from V. faba treated with nonhost saliva was not. We concluded that factors in aphid saliva play important roles in specific volatile production in V. faba. We are going to investigate the chemical characteristics of aphid saliva and the substances which elicit HIPV production.
2008-10-06