Identification of semiochemicals released during aphid feeding that attract parasitoid Aphidius ervi

被引:385
作者
Du, YJ
Poppy, GM
Powell, W
Pickett, JA
Wadhams, LJ [1 ]
Woodcock, CM
机构
[1] IACR Rothamsted, Biol & Ecol Chem Dept, Harpenden AL5 2JQ, Herts, England
[2] IACR Rothamsted, Dept Entomol & Nematol, Harpenden AL5 2JQ, Herts, England
关键词
Homoptera; Aphididae; Hymenoptera; Braconidae; tritrophic interactions; host foraging; plant volatiles; semiochemicals; induction; synomones; wind tunnel; GC-EAG; Acyrthosiphon pisum; Aphidius ervi; Vicia faba; Aphis fabae;
D O I
10.1023/A:1021278816970
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Herbivore induced release of plant volatiles mediating the foraging behavior of the aphid parasitoid Aphidius ervi was investigated using the pea aphid, Acyrthosiphon pisum, feeding on broad bean, Vicia faba. Behavioral responses were studied using an olfactometer and a wind tunnel. Volatiles obtained by air entrainment of aphid infested plants were more attractive to A. ervi than those from uninfested plants, in both behavioral bioassays. GC-EAG of both extracts showed a number of peaks associated with responses by A. ervi, but with some differences between extracts. Compounds giving these peaks were tentatively identified by CC-MS and confirmed by comparison with authentic samples on CC, using two columns of different polarity. The activity of pure compounds was further investigated by EAG and wind tunnel assays. Results showed that, of the compounds tested, 6-methyl-5-hepten-2-one was the most attractive for A. ervi females, with linalool, (Z)-3-hexen-1-yl acetate, (E)-beta-ocimene, (Z)-3-hexen-1-ol, and (E)-beta-farnesene all eliciting significantly more oriented flight behavior than a solvent control. Foraging experience significantly increased parasitoid responses to these compounds, with the exception of (E)-beta-farnesene. Time-course GC analysis showed that feeding of A. pisum on V. faba induced or increased the release of several compounds. Release of two of these compounds (6-methyl-5-hepten-2-one and geranic acid) was not induced by the nonhost black bean aphid, Aphis fabae. During the analysis period, production of (E)-beta-ocimene remained constant, but 6-methyl-5-hepten-2-one, linalool, geranic acid, and (E)-beta-farnesene appeared during the first day after A. pisum infestation and increased in concentration with increasing time of aphid feeding.
引用
收藏
页码:1355 / 1368
页数:14
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