Functional acclimation to solar UV-B radiation in Gunnera magellanica, a native plant species of southernmost Patagonia

C. V. Giordano, T. Mori, Osvaldo Sala, A. L. Scopel, M. M. Caldwell, C. L. Ballaré

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The ecosystems of Tierra del Fuego (in southern Patagonia, Argentina) are seasonally exposed to elevated levels of ultraviolet-B radiation (UV-B: 280-315 nm), due to the passage of the 'ozone hole' over this region. In the experiments reported in this article the effects of solar UV-B and UV-A (315-400 nm) on two UV-B defence-related processes: the accumulation of protective UV-absorbing compounds and DNA repair, were tested. It was found that the accumulation of UV-absorbing sunscreens in Gunnera magellanica leaves was not affected by plant exposure to ambient UV radiation. Photorepair was the predominant mechanism of cyclobutane-pyrimidine dimer (CPD) removal in G. magellanica. Plants exposed to solar UV had higher CPD repair capacity under optimal conditions of temperature (25 °C) than plants grown under attenuated UV. There was no measurable repair at 8 °C. The rates of CPD repair in G. magellanica plants were modest in comparison with other species and, under equivalent conditions, were about 50% lower than the repair rates of Arabidopsis thaliana (Ler ecotype). Collectively our results suggest that the susceptibility of G. magellanica plants to current ambient levels of solar UV-B in southern Patagonia may be related to a low DNA repair capacity.

Original languageEnglish (US)
Pages (from-to)2027-2036
Number of pages10
JournalPlant, Cell and Environment
Volume26
Issue number12
DOIs
StatePublished - Dec 2003
Externally publishedYes

Fingerprint

Acclimatization
ultraviolet radiation
acclimation
Pyrimidine Dimers
Argentina
Radiation
pyrimidines
DNA Repair
DNA repair
Ozone Depletion
Ecotype
Sunscreening Agents
Arabidopsis
Ecosystem
ecotypes
ozone
Gunnera magellanica
Arabidopsis thaliana
Temperature
ecosystems

Keywords

  • Cyclobutane-pyrimidine dimer photorepair
  • Ozone depletion
  • UV-absorbing compounds
  • UV-B

ASJC Scopus subject areas

  • Plant Science

Cite this

Functional acclimation to solar UV-B radiation in Gunnera magellanica, a native plant species of southernmost Patagonia. / Giordano, C. V.; Mori, T.; Sala, Osvaldo; Scopel, A. L.; Caldwell, M. M.; Ballaré, C. L.

In: Plant, Cell and Environment, Vol. 26, No. 12, 12.2003, p. 2027-2036.

Research output: Contribution to journalArticle

Giordano, C. V. ; Mori, T. ; Sala, Osvaldo ; Scopel, A. L. ; Caldwell, M. M. ; Ballaré, C. L. / Functional acclimation to solar UV-B radiation in Gunnera magellanica, a native plant species of southernmost Patagonia. In: Plant, Cell and Environment. 2003 ; Vol. 26, No. 12. pp. 2027-2036.
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