Physiological plasticity of <i>Dictyota kunthii</i> (Phaeophyceae) to copper excess

Simple item page
dc.contributor.authorSordet, C.
dc.contributor.authorContreras-Porcia, L.
dc.contributor.authorLovazzano, C.
dc.contributor.authorGoulitquer, S.
dc.contributor.authorAndrade, S.
dc.contributor.authorPotin, P.
dc.contributor.authorCorrea, J. A.
dc.date.accessioned2025-01-23T21:44:59Z
dc.date.available2025-01-23T21:44:59Z
dc.date.issued2014
dc.description.abstractThe brown alga Dictyota kunthii is one of the dominant species in the coastal areas of northern Chile affected by copper enrichment due to accumulated mining wastes. To assess its physiological plasticity in handling copper-mediated oxidative stress, 4-days copper exposure (ca. 100 mu g/L) experiments were conducted with individuals from a copper impacted area and compared with the responses of plants from a non-impacted site. Several biochemical parameters were then evaluated and compared between populations. Results showed that individuals from the copper-impacted population normally displayed higher levels of copper content and antioxidant enzymes activity (catalase (CAT), ascorbate peroxidase (AP), dehydroascorbate reductase (DHAR), glutathione peroxidase (GP) and peroxiredoxins (PRX)). After copper exposure, antioxidant enzyme activity increased significantly in plants from the two selected sites. In addition, we found that copper-mediated oxidative stress was associated with a reduction of glutathione reductase (GR) activity. Moreover, metabolic profiling of extracellular metabolites from both populations showed a significant change after plants were exposed to copper excess in comparison with controls, strongly suggesting a copper-induced release of metabolites. The copper-binding capacity of those exudates was determined by anodic stripping voltammetry (ASV) and revealed an increased ligand capacity of the medium with plants exposed to copper excess. Results indicated that D. kunthii, regardless their origin, counteracts copper excess by various mechanisms, including metal accumulation, activation of CAT, AP, DHAR, GP and PRX, and an induced release of Cu binding compounds. Thus, plasticity in copper tolerance in D. kunthii seems constitutive, and the occurrence of a copper-tolerant ecotype seems unlikely. (C) 2014 Elsevier B.V. All rights reserved.
dc.fuente.origenWOS
dc.identifier.doi10.1016/j.aquatox.2014.02.018
dc.identifier.eissn1879-1514
dc.identifier.issn0166-445X
dc.identifier.urihttps://doi.org/10.1016/j.aquatox.2014.02.018
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/101703
dc.identifier.wosidWOS:000336187900025
dc.language.isoen
dc.pagina.final228
dc.pagina.inicio220
dc.revistaAquatic toxicology
dc.rightsacceso restringido
dc.subjectSeaweed
dc.subjectCopper stress
dc.subjectCu complexing compounds
dc.subjectExudates
dc.subjectCopper accumulation
dc.titlePhysiological plasticity of <i>Dictyota kunthii</i> (Phaeophyceae) to copper excess
dc.typeartículo
dc.volumen150
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
Files
Collections
Artículos de revistas