Preliminary data on the accumulation of usnic acid related to ozono depletion in two lichens
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The absorbing properties of UV radiation of lichen phenols agree with their
photoprotector capacity determined by in vivo and in vitro methods. The
photostability that characterizes these compounds makes it possible to study
the relations between the UV absorbers and ozone levels in different time
scales. Usnic acid is the most frequent UV-B absorber in antarctic lichens. In
Neuropogon aurantiaco-ater (Jacq) I.M. Lamb. and Ramalina terebrata Hook. et
Tayl., collected in Antarctica over a period of 30 years, the highest
concentrations of usnic acid were observed when ozone diminished to critical
values.
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SCIOPS
