The plant signal compounds jasmonic acid or salicylic acid were applied as abiotic elicitors to leaves of glucosinolate-containing members of the Tropaeolaceae (Tropaeolum majus) and Caricaceae (Carica papaya) and to leaves of the glucosinolate-free plant cucumber. Both compounds are known to induce the accumulation of glucosinolates in Brassica plants. In roots of glucosinolate-containing plants the two compounds enhanced glucosinolate levels or new glucosinolates were accumulated. In all plants treated with jasmonic acid a reduction of root colonization by the arbuscular mycorrhizal fungus Glomus mosseae was observed, No such effect occurred after the salicylic acid treatment.In addition, members of the glucosinolate-containing Tropaeolaceae family were inoculated with the arbuscular mycorrhizal fungus (AMF), and later on the glucosinolate content was determined in roots of mycorrhizal and in roots of non-mycorrhizal plants. Root colonization by the AMF resulted in a large increase of the glucosinolate content, however, the glucosinolate levels in mycorrhizal and in non-mycorrhizal plants showed no effect on root colonization by the AMF.From our results we concluded that the glucosinolate levels can not generally be linked to the nonhost status of glucosinolate-containing plants, however, a role of specific glucosinolates in the expression of the non-host status of glucosinolate-containing plants can not be excluded. Moreover, we found that the application of jasmonic acid highly suppresses mycorrhization and this suppression is not a glucosinolate-dependent mechanism.