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The effect of oil sands process-affected water and naphthenic acids on the germination and development of Arabidopsis.

Abstract：

:Oil sands mining in the Athabasca region of northern Alberta results in the production of large volumes of oil sands process-affected water (OSPW). We have evaluated the effects of OSPW, the acid extractable organic (AEO) fraction of OSPW, and individual naphthenic acids (NAs) on the germination and development of the model plant, Arabidopsis thaliana (Arabidopsis). The surrogate NAs that were selected for this study were petroleum NAs that have been used in previous toxicology studies and may not represent OSPW NAs. A tricyclic diamondoid NA that was recently identified as a component of OSPW served as a model NA in this study. Germination of Arabidopsis seeds was not inhibited when grown on medium containing up to 75% OSPW or by 50mgL(-1) AEO. However, simultaneous exposure to three simple, single-ringed surrogate NAs or a double-ringed surrogate NA had an inhibitory effect on germination at a concentration of 10mgL(-1), whereas inhibition of germination by the diamondoid model NA was observed only at 50mgL(-1). Seedling root growth was impaired by treatment with low concentrations of OSPW, and exposure to higher concentrations of OSPW resulted in increased growth inhibition of roots and primary leaves, and caused bleaching of cotyledons. Treatment with single- or double-ringed surrogate NAs at 10mgL(-1) severely impaired seedling growth. AEO or diamondoid NA treatment was less toxic, but resulted in severely impaired growth at 50mgL(-1). At low NA concentrations there was occasionally a stimulatory effect on root and shoot growth, possibly owing to the broad structural similarity of some NAs to known plant growth regulators such as auxins. This report provides a foundation for future studies aimed at using Arabidopsis as a biosensor for toxicity and to identify genes with possible roles in NA phytoremediation.

journal_name

Chemosphere

journal_title

Chemosphere

authors

Leishman C,Widdup EE,Quesnel DM,Chua G,Gieg LM,Samuel MA,Muench DG

doi

10.1016/j.chemosphere.2013.04.101

subject

Has Abstract

pub_date

2013-09-01 00:00:00

pages

380-7

issue

eissn

0045-6535

issn

1879-1298

pii

S0045-6535(13)00743-1

journal_volume

pub_type

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The effect of oil sands process-affected water and naphthenic acids on the germination and development of Arabidopsis.