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We previously reported the isolation of eleven new cardiac glycosides called cheiranthosides I-XI together with two known ones (olitoriside and erysimoside) from the seeds of Erysimum cheiranthoides L. The glycosides were evaluated for their inhibitory activity against Na+,K(+)-ATPase by comparing
The possible effects of environmental stress on plant chemistry that are important to herbivorous insects were examined by growing a wild crucifer, Erysimum cheiranthoides, under different nutrient regimes. Oviposition by the cabbage butterfly, Pieris rapae, is thought to be affected by the balance
Avoidance of some crucifer species by the crucifer specialist,Pieris rapae, has been attributed to the presence of oviposition deterrents in these plants. Studies on one such unacceptable plant,Erysimum cheiranthoides, have resulted in the isolation ofn-butanol-soluble deterrents from the alcoholic
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