Effects of the Glyphosate Application on the Physio-Biochemical Parameters of Xanthoria parietina

Résumé

The extended use of Glyphosate as herbicide in weed's control can lead to the damage of the ecosystem. Ecological indicators can be used as early warning signals to assess the environmental problems. In order to evaluate the performance of the lichen as an air pollution bio monitoring, we investigated if treatment of the lichen Xanthoria parietina with Glyphosate causes bio physiological alterations. In this respect, the effect of various herbicide doses on the lichen's bio physiology was tested in the laboratory during 7 days under controlled conditions. Samples of lichen, naturally grown, were collected from different forest's sites and were treated at the recommended doses as well as with double doses. The findings have shown a clear reduction in the photosynthetic pigments. Of particular importance in this respect, are the pigments chlorophyll (a), (b), (a+b) and carotenoid. However, an increase in the total protein, sugar and proline products levels was observed. Finally this study shows that Xanthoria parietina is an appropriate organism for the bio monitoring of undesirable effects of the Glyphosate.

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