Abstract
Brevicoryne brassicae is highly host-specific, feeding almost exclusively on the phloem sap of Brassica or other closely related plant species. Despite the evolution of specific feeding apparatus and the protection afforded by the stylet sheath, aphids may be exposed to sufficient amounts of secondary plant compounds transported by the phloem to reflect the suitability of potential species as host plants. Glucosinolates are the characteristic secondary plant compounds of brassi-ca crops, responsible for the odour and flavour and are major determinants in the feeding response of the Brassica specialist B. brassicae. When glucosinolate profiles of some partially-resistant cauliflower varieties were analyzed, increased concentrations of 2-phenylethylglucosinolate were detected (Kazantzidou et al., 1994). The glucosinolate content of brassica crops can be altered as a systemic response to plant signalling molecules such as salicylic acid (Kiddle et al., 1994). 2-Phenylethylglucosinolate showed the greatest increase in concentration in oilseed rape within days of treatment with 10 mM root drench of the abiotic elicitor salicylic acid.
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