Ultraviolet-absorbing capacity of aquatic bryophytes from Tierra del Fuego (Argentina)

  1. Otero, S. 2
  2. Cezón, K. 1
  3. Martínez-Abaigar, J. 2
  4. Núñez-Olivera, E. 2
  1. 1 Real Jardín Botánico
    info

    Real Jardín Botánico

    Madrid, España

  2. 2 Universidad de La Rioja
    info

    Universidad de La Rioja

    Logroño, España

    ROR https://ror.org/0553yr311

Revista:
Journal of Bryology

ISSN: 0373-6687

Año de publicación: 2008

Volumen: 30

Número: 4

Páginas: 290-296

Tipo: Artículo

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DOI: 10.1179/174328208X300741 SCOPUS: 2-s2.0-58149252062 WoS: WOS:000263025500006 GOOGLE SCHOLAR

Otras publicaciones en: Journal of Bryology

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Resumen

We analyzed the form of the UV-absorption spectra and calculated the bulk UV-absorption capacity of the methanolic extracts (BUVACME) in 15 bryophytes (five liverworts and 10 mosses) from unshaded aquatic habitats of Tierra del Fuego (Argentina). BUVACME was obtained as the area under the absorbance curve (AUC) in several ranges of the UV band to allow comparison with the literature data. Both the spectra form and the AUC values depended on the species considered. The spectra showed either no, one or two defined peaks. The peaks were probably due to phenolic derivatives, which could act as both screening compounds and antioxidants. The different AUCs calculated were highly and significantly correlated, and thus it may be unimportant which of these is used. The AUC values of most liverworts were higher than those of most mosses and in particular, the liverworts Noteroclada confluens and Triandrophyllum subtrifidum showed much higher BUVACMEs than those analyzed in any other bryophyte. Thus, the accumulation of UV-absorbing compounds might often increase protection against UV radiation in liverworts, but rarely in mosses. This is in line with the evolutionary differences between these two groups of bryophytes. Except for the two abovementioned liverwort species, BUVACME of aquatic bryophytes from Tierra del Fuego is not particularly different to that found in bryophytes from other zones of the planet. © British Bryological Society 2008.