Journal of Chemical Ecology

, Volume 18, Issue 7, pp 1125–1137 | Cite as

Furanocoumarin content and phototoxicity of rough lemon (Citrus jambhiri) foliage exposed to enhanced ultraviolet-B (UVB) irradiation

  • Eric S. McCloud
  • May R. Berenbaum
  • Robert W. Tuveson


Rooted cuttings ofC. jambhiri were grown under enhanced levels of UVB radiation for 95 days. Bacterial phototoxicity and furanocoumarin content were determined in extracts made from various tissues from the aboveground biomass. Young, newly expanded leaves contained significantly higher concentrations of furanocoumarins than older leaves and stems. Additionally, the proportional concentration of psoralen was higher in young leaves than in old leaves. While treatment with UVB did not result in a change in the overall level of furanocoumarins, it did cause an increase in the ratio of psoralen to bergapten. Bacterial phototoxicity paralleled the distribution of furanocoumarin content among tissue types; analysis of covariance suggested that the phototoxic properties of the extracts could be accounted for on the basis of furanocoumarin content alone.

Key Words

Citrus jambhiri furanocoumarins phototoxins ultraviolet-B radiation plant-herbivore interactions psoralen bergapten 


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Copyright information

© Plenum Publishing Corporation 1992

Authors and Affiliations

  • Eric S. McCloud
    • 1
  • May R. Berenbaum
    • 1
  • Robert W. Tuveson
    • 2
  1. 1.Department of EntomologyUniversity of IllinoisUrbana
  2. 2.Department of MicrobiologyUniversity of IllinoisUrbana

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