Cell compartmentation of UV-absorbing compounds in two aquatic mosses under enhanced UV-B

  1. Fabón, G. 1
  2. Monforte, L. 1
  3. Tomás-Las-Heras, R. 1
  4. Martínez-Abaigar, J. 1
  5. Núñez-Olivera, E. 1
  1. 1 Universidad de La Rioja
    info

    Universidad de La Rioja

    Logroño, España

    ROR https://ror.org/0553yr311

Revista:
Cryptogamie Bryologie

ISSN: 1290-0796

Año de publicación: 2012

Volumen: 33

Número: 2

Páginas: 169-184

Tipo: Artículo

DOI: 10.7872/CRYB.V33.ISS2.2012.169 SCOPUS: 2-s2.0-84861382006 WoS: WOS:000304430400009 GOOGLE SCHOLAR

Otras publicaciones en: Cryptogamie Bryologie

Repositorio institucional: lock_openAcceso abierto Editor

Resumen

The effects of enhanced UV-B radiation on UV-absorbing compounds (UVAC), the maximum quantum yield of photosystem II (Fv/Fm), DNA integrity, and the sclerophylly index, were analyzed in the mosses Bryum pseudotriquetrum and Fontinalis antipyretica. The study was performed for 31 days under laboratory conditions. Enhanced UV-B increased the bulk level of the vacuolar soluble UVAC (SUVAC) in both mosses and the concentration of two different soluble kaempferols in B. pseudotriquetrum. However, enhanced UV-B had no effect on the bulk level of cell wall-bound insoluble UVAC (WUVAC) in both mosses and the concentration of insoluble p-coumaric acid in F. antipyretica. Thus, the insoluble fraction would be less UV-B-responsive than the soluble one. This probably happened because (1) the constitutively high bulk level of WUVAC (and noticeably higher than that of SUVAC) would already provide a sufficiently effective protection; and (2) WUVAC would be relatively immobilized in the cell wall, which would limit the reaction capacity of these compounds to UV-B. The protective mechanisms developed by both mosses could not totally prevent UV-B damage, which was indicated by the modest decrease of Fv/F m and the increase in DNA damage. We discuss the ecological and phylogenetic implications of the differences in UVAC compartmentation between liverworts and mosses. © 2012 Adac. Tous droits réservés.