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Foliar and emission composition of essential oil in two carrot varieties

Kainulainen, P., Tarhanen, J., Tiilikkala, K., Holopainen, J.K.
Journal of agricultural and food chemistry 1998 v.46 no.9 pp. 3780-3784
Daucus carota, varieties, leaves, essential oils, monoterpenoids, sesquiterpenoids, volatile compounds, greenhouse production, field experimentation, insect pests, chemical constituents of plants
The compositions of leaf essential oil of two carrot varieties growing in different growth conditions were studied. About 50 monoterpenoids, sesquiterpenoids, and propenylbenzenes were found. The essential oil compositions, for example, the relative proportions of sabinene and limonene, were significantly different between the varieties. Young leaves contained more propenylbenzenes, methylisoeugenol, and alpha-asarone than old leaves. There were also significant differences in essential oil composition between leaflets and petioles. Within varieties variation of essential oil composition in individual carrots was detected, which suggests genetical impurity within breeding lines of varieties. There were no significant differences between composition and concentration of compounds in carrot leaves grown in a greenhouse and in an open field. Headspace volatiles collected from carrot leaves contained the same compounds as in leaf extracts, but proportions were different due to different volatilization rates of compounds. These results suggest that there is a high variation in secondary compound composition among different carrot varieties and that the relative abundance of compounds changes during growth, which might have important value in host selection to carrot pests.