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Investigating heritability of cadmium tolerance in Chironomus riparius natural populations: A physiological approach.

Abstract：

:Physiological responses allow populations to cope with metal contamination and can be involved in the evolution of tolerance under historical metal contamination scenarios. Here we investigate physiological aspects that might be underlying the heritable high tolerance to cadmium (Cd) in two Chironomus riparius populations collected from historically metal contaminated sites in comparison to two populations from reference sites. To evaluate differences in the physiological response to short-term Cd exposure, protein expression profiles, metallothioneins [MTs] and several antioxidant defences such as total glutathione (GSHt), catalase (CAT) and glutathione-S-transferases [GSTs], were measured in all four populations reared for at least 8 generations under laboratory clean conditions. Cd-induced oxidative damage in lipids and energy related parameters (energy consumption and energy reserves) were also assessed. Results showed two major gradients of protein profiles according to Cd concentration and population tolerance. Furthermore, Cd-tolerant populations showed higher baseline levels of MTs and GSHt while Cd-sensitive populations, collected from reference sites, showed significant induction of GSHt levels with Cd exposure that were nonetheless insufficient to avoid increased oxidative damage to lipids. Cd exposure had no clear effects on the antioxidant enzymes or energy reserves but triggered a general increase in energy consumption. Finally, energy consumption was higher in Cd-tolerant populations across experimental conditions. Altogether, results demonstrate that inherited Cd-tolerance in these midge populations is related, at least in part, with different constitutive levels and plasticity of different defence mechanisms confirming the validity of using multiple physiological traits when studying evolution of tolerance.

journal_name

Chemosphere

journal_title

Chemosphere

authors

Pedrosa J,Gravato C,Campos D,Cardoso P,Figueira E,Nowak C,Soares AMVM,Barata C,Pestana JLT

doi

10.1016/j.chemosphere.2016.12.008

subject

Has Abstract

pub_date

2017-03-01 00:00:00

pages

83-94

eissn

0045-6535

issn

1879-1298

pii

S0045-6535(16)31719-2

journal_volume

170

pub_type

杂志文章

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