کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4419359 | 1618935 | 2016 | 10 صفحه PDF | دانلود رایگان |
• Cadmium reduces growth and chlorophyll content of Chlamydomonas moewusii.
• Cadmium induces the synthesis of phytochelatins as defence mechanism.
• Sulphate and cadmium show an antagonistic effect on the microalgal physiology.
• Sulphate enhances the synthesis of phytochelatins.
Cadmium is considered as one of the most hazardous metals for living organism and ecosystems. Environmental factors play an important role since they alter the toxicity of metals by varying the bioavailability of these elements for the organisms. The aim of the present study was to investigate, using the freshwater microalga Chlamydomonas moewusii, the existence of an interaction between cadmium and sulphate as a factor that varied the toxicity of this metal. Different cell parameters such as cell growth, content of chlorophylls and biosynthesis of phytochelatins (PCs) were determined. A two-way ANOVA showed that the interaction had a significant effect size of 21% (p<0.001) for the growth of this microalga and around of a 6% on the content of chlorophylls/cell. The effect of this inhibition was that when the concentration of sulphate increased, a lower toxic effect of cadmium on the growth and on the content of chlorophylls was observed. In addition, the increase of sulphate concentration allowed the biosynthesis of a higher amount of PCs and/or PCs with higher chain length. This higher biosynthesis was responsible for the reduction of the toxic effect of cadmium and explained the interaction.
Journal: Ecotoxicology and Environmental Safety - Volume 128, June 2016, Pages 236–245