Journal of Chemical Ecology

, Volume 19, Issue 11, pp 2577–2591

Seasonal variation of exudate ofCistus ladanifer

  • Natividad Chaves
  • José Carlos Escudero
  • Carlos Gutiérrez-Merino
Article

DOI: 10.1007/BF00980692

Cite this article as:
Chaves, N., Escudero, J.C. & Gutiérrez-Merino, C. J Chem Ecol (1993) 19: 2577. doi:10.1007/BF00980692

Abstract

The production of labdanum exudate byCistus ladanifer L. is highly seasonal, reaching a maximum concentration during summer and a minimum concentration in winter. Because this exudate strongly absorbs in the wavelength range of 260–400 nm (the near-UV-visible range), it may be important biologically as an UV-visible filter. Separation of exudate components has been achieved by reverse-phase high-performance liquid chromatography (HPLC).The retention times of HPLC chromatograms and the spectral characteristics (absorption and fluorescence) of the exudate identify flavonoids as the most relevant chromophores regarding the potency of the exudate as a UV-visible filter. HPLC studies show that kaempferol-3-(O)methyl, kaempferol-3,7-di(O)methyl, and apigenin-4′-(O)methyl are the most enriched flavonoids in the exudate.Other flavonoids [apigenin, apigenin-7-(O)methyl, apigenin-7,4′-di(O)methyl, kaempferol-3,4′-di(O)methyl and kaempferol-3,7,4′-tri(O)methyl] are present in the exudate as minor components, e.g., each contributes by less than 10% to total flavonoids.The ratio of kaempferols to apigenins of the exudate also shows seasonal variation (maximum value in summer and minimum in spring). However, due to the similar absorption spectra of both groups of flavonoids, this has a minor influence on the exudate's ability to filter near-UV-visible radiation.

Key words

Flavonoids seasonal variation Cistus ladanifer L. UV filter labdanum exudate 

Copyright information

© Plenum Publishing Corporation 1993

Authors and Affiliations

  • Natividad Chaves
    • 1
  • José Carlos Escudero
    • 1
  • Carlos Gutiérrez-Merino
    • 2
  1. 1.Departamento de Ecologia Facultad de CienciasUniversidad de ExtremaduraBadajozSpain
  2. 2.Departamento de Bioquímica y Biología Molecular Facultad de CienciasUniversidad de ExtremaduraBadajozSpain

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