Interactive effects of UV-B radiation and chemical contamination on physiological parameters in the lichen Ramalina lacera

Jacob Garty, Tal Levin, Haya Lehr, Sharon Tomer, Ayala Hochman

Research output: Contribution to journalReview articlepeer-review

Abstract

To assess the impact of ultraviolet B (UV-B) radiation under laboratory conditions on lichens from different biomonitoring sites, thalli of the lichen Ramalina lacera were transplanted from a clean air site to nine different polluted sites in Israel. Our objective was to determine the probability of synergistic/antagonistic effects on physiological parameters by considering two stressors: chemical contamination and UV-B. Exposure to both airborne pollutants in the field and subsequent UV-B radiation in the laboratory which led to a severe disintegration of cell membranes, followed by electrolyte leakage, indicate the probability of a synergistic effect. The impairment of the potential quantum yield of electron transfer through photosystem II (PSII) of photosynthesis indicated by a significant decrease of the ratio Fv /Fm, further demonstrated the synergistic effect of both chemical contamination and UV-B radiation. Besides enlarged amounts of stress-ethylene in lichens at contaminated sites, the reduced levels of ethylene production upon UV-B radiation in the present study suggest the likelihood of an antagonistic effect of xenobiotic elements and UV-B radiation as a result of an impaired ethylene-producing system.

Original languageEnglish
Pages (from-to)267-289
Number of pages23
JournalJournal of Atmospheric Chemistry
Volume49
Issue number1-3
DOIs
StatePublished - Nov 2004

Keywords

  • Air pollution
  • Biomonitoring
  • Lichen physiology
  • Synergistic/antagonistic effects
  • UV-B radiation

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