INVESTIGADORES
LIBKIND FRATI Diego
artículos
Título:
Occurrence of Photoprotective Compounds in Yeasts from Freshwater Ecosystems of Northwestern Patagonia (Argentina)
Autor/es:
LIBKIND, DIEGO; DIÉGUEZ, MC; MOLINÉ, M; PÉREZ, P; ZAGARESE, H; VAN BROOCK, M.R.
Revista:
PHOTOCHEMISTRY AND PHOTOBIOLOGY
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Lugar: Londres; Año: 2006 vol. 82 p. 972 - 980
ISSN:
0031-8655
Resumen:
In this paper we present the results of research on the
occurrence, induction and role of photoprotective compounds
(PPCs) present in native aquatic yeasts from
freshwater Patagonian ecosystems. We focus on the effect
of UV radiation (UVR) as a factor that controls the level
of photoprotection of yeasts, and explore its potential
significance in shaping yeast distributional patterns. The research
presented here combines field surveys and laboratory
work, including the isolation and culture of native
yeasts strains, and laboratory assays under different radiation
conditions. The results obtained suggest that yeasts
are common dwellers of oligotrophic Patagonian water
bodies, and provide the first evidence of the distribution
of PPC (carotenoid and mycosporine)producing yeasts
in temperate freshwaters. A greater proportion of carotenogenic
yeasts were observed in high-elevation lakes. The
yeast strains isolated from these environments were found
to produce higher amounts of mycosporines (MYCs), and to
present higher tolerance to UVB exposure than those from
piedmont lakes. Patagonian yeasts have only one type of
MYC, mycosporine-glutaminol-glucoside (myc-glu-glu), which
seems common to all other yeasts. By analyzing the production
of myc-glu-glu in a large number of yeasts belonging
to different taxonomic groups, we propose that this compound
may have potential use as a chemotaxonomic marker
in yeast systematics. Collectively, our work reveals that in
Patagonian freshwater yeasts there is an apparent relationship
between the ability to produce PPCs, their tolerance to
UV exposure and their success in colonizing habitats highly
exposed to UVR.