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Epidermal UV-screening in vascular plants from Svalbard (Norwegian Arctic)

Författare:
Publiceringsår: 2004
Språk: Engelska
Sidor: 383-390
Publikation/Tidskrift/Serie: Polar Biology
Volym: 27
Nummer: 7
Dokumenttyp: Artikel
Förlag: Springer Berlin / Heidelberg

Sammanfattning

Stratospheric ozone depletion is most pronounced
at high latitudes, and the concurring increased
UV-B radiation might adversely affect plants from polar
areas. However, vascular plants may protect themselves
against UV-B radiation by UV-absorbing compounds located in the epidermis. In this 3-year study, epidermal
UV-B (kmax 314 nm) and UV-A (kmax 366 nm) screening
was assessed using a fluorescence method in 12 vascular
species growing in their natural environment at Svalbard.
The potential for acclimation to increased radiation was
studied with artificially increased UV-B, simulating 11 percent
ozone depletion. Open-top chambers simulated an increase in temperature of 2-3 degree C in addition to the UV-B manipulation. Adaxial epidermal UV-B transmittance
varied between 1.6 and 11.4 percent. Artificially increased
UV-B radiation and temperature did not consistently
influence the epidermal UV-B transmittance in any of the
measured species, suggesting that they may not have
the potential to increase their epidermal screening, or that
the screening is already high enough at the applied UV-B
level. We propose that environmental factors other than
UV-B radiation may influence epidermal UV-B screening.

Disputation

Nyckelord

  • Biology and Life Sciences
  • ozone depletion ultraviolet-B radiation plants epidermis

Övriga

Published
  • Photobiology
Yes
  • Photobiology
  • ISSN: 0722-4060
  • ISSN: 1432-2056

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