A chemical basis for differential acceptance ofErysimum cheiranthoides by twoPieris species
- 1 February 1993
- journal article
- Published by Springer Nature in Journal of Chemical Ecology
- Vol. 19 (2) , 195-210
- https://doi.org/10.1007/bf00993689
Abstract
Wormseed mustard,Erysimum cheiranthoides, is unacceptable as a host for the cabbage butterfly,Pieris rapae. However, it is preferred for oviposition byPieris napi oleracea in the greenhouse. Isolation and identification of the oviposition stimulants toP. napi oleracea were accomplished by C18 open-column chromatography, TLC, ion-exchange chromatography, HPLC, UV, and NMR spectroscopy. Glucoiberin and glucocheirolin were identified as the most active stimulants. The extracted glucoiberin was as stimulatory as glucocheirolin, although its concentration in theErysimum plants was about 10 times lower than that of glucocheirolin. These glucosinolates were only weak stimulants toP. rapae. Furthermore,P. rapae was strongly deterred by the cardenolides, erysimoside and erychroside, fromE. cheiranthoides, andP. napi oleracea was less sensitive to these compounds. No other deterrent toP. napi oleracea was detected in this plant species. The results explain the differential acceptance ofE. cheiranthoides by these twoPieris species.Keywords
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