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Plant Ecology

, Volume 165, Issue 2, pp 263–273 | Cite as

Ecological importance of ambient solar ultraviolet radiation to a sub-arctic heath community

  • Gareth K. Phoenix
  • Dylan Gwynn-Jones
  • John A. Lee
  • Terry V. Callaghan
Article

Abstract

While there is considerable knowledge of the effects of enhanced levelsof ultraviolet radiation (UV) on plant species, much less is known of theimportance of ambient levels of solar UV, particularly on natural plantcommunities. Effects of ambient solar UV radiation on a natural sub-Arcticheathcommunity were investigated in a three year UV exclusion experiment in northernSweden (68° N). UV transparent and UV opaque (excluding< 400 nm) plexiglas screens were placed over vegetation forthree years to determine ambient solar UV effects on growth, reproduction andphenology of the three dominant dwarf shrub species, Vacciniumuliginosum, V. vitis-idaea andEmpetrum hermaphroditum. Additionally, effects of ambientsolar UV radiation on leaf protection from UV-B were assessed throughmeasurements of leaf UV-B absorbing compounds. Flowering and berry productionbyV. uliginosum were greatly increased (by five and 15 fold)in plots receiving ambient solar UV compared to those where solar UV had beenexcluded for three years. However, solar UV had no effect on stem growth,senescence and cover of the dwarf shrub species studied. It was thereforeconcluded that sub-Arctic dwarf shrubs are generally tolerant of ambient solarUV. Counterintuitively, ambient solar UV radiation reduced the levels of UV-Babsorbing compounds in both Vaccinium species suggesting areduction in protection provided. This indicates that measurements of leaf UV-Babsorbing compounds do not necessarily provide a good indicator of planttolerance to UV.

Dwarf shrubs Empetrum Growth Reproduction UV-B absorbing compounds Vaccinium 

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References

  1. Bachereau F., Marigo G. and Asta J. 1998. Effects of solar radiation (UV and visible) at high altitude on CAM-cycling and phenolic compound biosynthesis in Sedum album. Physiol. Plant 104: 203–210.Google Scholar
  2. Balakumar T., Vincent V.H.B. and Paliwal K. 1993. On the interaction of UV-B radiation (280-315 nm) with water stress in crop plants. Physiol. Plant 87: 217–222.Google Scholar
  3. Ballaré C.L., Scopel A.L., Stapleton A.E. and Yanovsky M.J. 1996. Solar ultraviolet-B radiation affects seedling emergence, DNA integrity, plant morphology, growth rate, and attractiveness to herbivore insects in Datura ferox. Plant Physiol. 112: 161–170.Google Scholar
  4. Björn L.O., Callaghan T.V., Gehrke C., Gunnarson T., Holmgren B., Johanson U. et al. 1997. Effects on subarctic vegetation of enhanced UV-B radiation. In: Lumsden P. (ed.), Plants and UV-B: Responses to Environmental Change. Cambridge University Press, Cambridge.Google Scholar
  5. Caldwell M.M. 1971. Solar UV radiation and the growth and development in higher plants. In: Giese A.C. (ed.), Photophysiology. Vol. 6. Academic Press, New York.Google Scholar
  6. Caldwell M.M., Robberecht R. and Billings W.D. 1980. A steep latitudinal gradient of solar ultraviolet-B radiation in the arcticalpine life zone. Ecology 61: 600–611.Google Scholar
  7. Conover W.J. and Iman R.L. 1981. Rank transformation as a bridge between parametric and non-parametric statistics. Am. Stat. 35: 124–133.Google Scholar
  8. Day T.A. 1993. Relating UV-B radiation screening effectiveness of foliage to absorbing-compound concentration and anatomial characteristics in a diverse group of plants. Oecologia 95: 542–550.Google Scholar
  9. Day T.A., Howells B.W. and Ruhland C.T. 1996. Changes in growth and pigment concentrations with leaf age in pea under modulated UV-B radiation field treatments. Plant Cell Environ. 19: 101–108.Google Scholar
  10. Day T.A., Ruhland C.T., Grobe C.W. and Xiong F. 1999. Growth and reproduction of Antarctic vascular plants in response to warming and UV radiation reductions in the field. Oecologia 119: 24–35.Google Scholar
  11. Debevec E.M. and MacLean S.F. 1993. Design of greenhouses for the manipulation of temperature in tundra plant communities. Arctic Alp. Res. 25: 56–62.Google Scholar
  12. Fiscus E.L., Booker F.L. and Miller J.E. 1996. Response of soybean bulk leaf water relations to ultraviolet-B irradiation. J. Plant Physiol. 148: 63–68.Google Scholar
  13. Grammatikopoulos G., Kyparissis A., Drillias P., Petropoulou Y. and Manetas Y. 1998. Effects of UV-B radiation on cuticle thickness and nutritional value of leaves in two Mediterranean evergreen sclerophylls. J. Plant Physiol. 153: 506–512.Google Scholar
  14. Grammatikopoulos Y., Petropoulou G. and Manetas Y. 1999. Sitedependences in transmittance and UV-B-absorbing capacity of isolated leaf epidermis and mesophyll in Urginea maritima (L.) Baker. J. Exp. Bot. 50: 517–521.Google Scholar
  15. Gwynn-Jones D., Lee J.A. and Callaghan T.V. 1997. Effects of enhanced UV-B radiation and elevated carbon dioxide concentrations on a sub-Arctic forest heath ecosystem. Plant Ecol. 128: 242–249.Google Scholar
  16. Johanson U., Gehrke C., Björn L.O. and Callaghan T.V. 1995b. The effects of enhanced UV-B radiation on the growth of dwarf shrubs in a Subarctic heathland. Funct. Ecol. 9: 713–719.Google Scholar
  17. Johanson U., Gehrke C., Björn L.O., Callaghan T.V. and Sonesson M. 1995a. The effects of enhanced UV-B radiation on a sub-Arctic heath ecosystem. Ambio 24: 106–111.Google Scholar
  18. Krizek D.T., Britz S.J. and Mirecki R.M. 1998. Inhibitory effects of ambient levels of solar UV-A and UV-B radiation on growth of cv. New Red Fire lettuce. Physiol. Plant 103: 1–7.Google Scholar
  19. Krizek D.T., Mirecki R.M. and Britz S.J. 1997. Inhibitory effects of ambient levels of solar UV-A and UV-B radiation on growth of cucumber. Physiol. Plant 100: 886–893.Google Scholar
  20. Lovelock C.E., Clough B.F. and Woodrow I.E. 1992. Distribution and accumulation of ultraviolet-radiation-absorbing compounds in leaves of tropical mangroves. Planta 188: 143–154.Google Scholar
  21. Mazza C.A., Battista D., Zima A.M., Szwarcberg-Bracchitta M., Giordano C.V., Acevedo A. et al. 1999. The effects of solar ultraviolet-B radiation on the growth and yield of barley are ac-companied by increased DNA damage and antioxidant re-sponses. Plant Cell Environ. 22: 61-70.Google Scholar
  22. Molau U. and Shaver G.R. 1997. Controls on seed production and seed germinability in Eriophorum vaginatum. Global Change Biol. 3: 80–88.Google Scholar
  23. Molina M.J. and Rowland F.S. 1974. Stratospheric sink for chlorofluoromethanes: chlorine atom-catalyst destruction of ozone. Nature 249: 810–812.Google Scholar
  24. Phoenix G.K., Gwynn-Jones D., Lee J.A. and Callaghan T.V. 2000.The impacts of UV-B radiation on the regeneration of a sub-Arctic heath community. Plant Ecol. 146: 67–75.Google Scholar
  25. Phoenix G.K., Gwynn-Jones D., Callaghan T.V., Sleep D. and Lee J.A. 2001. Effects of global change on a sub-Arctic heath: effects of enhanced UV-B radiation and increased summer precipitation. J. Ecol. 89: 256–267.Google Scholar
  26. Rousseaux M.C., Ballaré C.L., Scopel A.L., Searles P.S. and Caldwell C.M. 1998. Solar ultraviolet-B radiation affects plant-insect interactions in a natural ecosystem of Tierra del Fuego (southern Argentina). Oecologia 116: 528–535.Google Scholar
  27. Rousseaux M.C., Ballaré C.L., Giordano C.V., Scopel A.L., Zima A.M., Szwarcberg-Bracchitta M. et al. 1999. Ozone depletion and UV-B radiation: Impact on plant DNA damage in South America. Proc. Nat. Acad. Sci (USA) 96: 15310-15315.Google Scholar
  28. Rozema J., Oudejans A., Houter N., Schoonheim H., Walraven I., van't Klooster C. et al. 1999. Responses of plants from a dune grassland ecosystem in the Netherlands to solar UV-B: UV-B filtration and supplimentation experiments. In: Rozema J. (ed.),Stratospheric Ozone Depletion: The Effects of Enhanced UV-B Radiation on Terrestrial Ecosystems. Backhuys Publishers, Leiden.Google Scholar
  29. Searles P.S., Caldwell M.M. and Winter K. 1995. The response of five tropical dicotyledon species to solar ultraviolet-B radiation. Am. J. Bot. 82: 445–453.Google Scholar
  30. Searles P.S., Flint S.D., Diaz S.B., Rousseaux M.C., Ballaré C.L. and Caldwell M.M. 1999. Solar ultraviolet-B radiation influence on Sphagnum bog and Carex fen ecosystems: first field season findings in Tierra del Fuego, Argentina. Global Change Biol. 5: 225–234.Google Scholar
  31. Sonesson M. and Callaghan T.V. 1991. Strategies of survival in plants of the Fennoscandian tundra. Arctic 44: 95–105.Google Scholar
  32. Stenstöm M., Gugerli F. and Henry G.H.R. 1997. Response of Saxifraga oppositifolia L. to simulated climatic change at three contrasting latitudes. Global Change Biol. 3: 44–54.Google Scholar
  33. Stephanou M. and Manetas Y. 1997. The effects of season, exposure, enhanced UV-B radiation, and water stress on leaf epicuticular and internal UV-B absorbing capacity of Cistus creticus: a Mediterranean field study. J. Exp. Bot. 48: 1977–1985.Google Scholar
  34. Stephanou M. and Manetas Y. 1998. Enhanced UV-B radiation increases the reproductive effort in the Mediteranean shrub Cistus creticus under field conditions. Plant Ecol. 134: 91–96.Google Scholar
  35. Sullivan J.H., Howells B.W., Ruhland C.T. and Day T.A. 1996. Changes in leaf expansion and epidermal screening effectiveness in Liquidambar styraciflua and Pinus taeda in response to UV-B radiation. Physiol. Plant 98: 349–357.Google Scholar
  36. Thimijan R.W., Carnes H.R. and Cambell L.E. 1978. Radiation Sources and Relative Environmental Control for Biological and Climatic Effects of UV Research (BACER). Final report (EPAIAG-D60168). Environmental Protection Agency, Washington.Google Scholar
  37. Tosserams M., Magendans E. and Rozema J. 1997. Differential effects of elevated ultraviolet-B radiation on plant species of a dune grassland ecosystem. Plant Ecol. 128: 266–281.Google Scholar
  38. Tosserams M., Pais de Sà A. and Rozema J. 1996. The effect of solar UV radiation on four plant species occurring in a coastal grassland vegetation in The Netherlands. Physiol. Plant 97: 731–739.Google Scholar
  39. van de Staaij J.W.M., Ernst W.H.O., Hakvoort H.W.J. and Rozema J. 1995. Ultraviolet-B (280-320 nm) absorbing pigments in the leaves of Silene vulgaris: their role in UV-B tolerance. J. Plant Physiol. 147: 75–80.Google Scholar

Copyright information

© Kluwer Academic Publishers 2003

Authors and Affiliations

  • Gareth K. Phoenix
    • 1
  • Dylan Gwynn-Jones
    • 1
  • John A. Lee
    • 1
  • Terry V. Callaghan
    • 1
  1. 1.Department of Animal and Plant SciencesUniversity of SheffieldSheffieldUK

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