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DETERMINATION OF THE TOXIC EFFECTS OF MERCURY IN THE Brachiaria dictyoneura (Fig. & De Not.) Stapf SPECIES

Keywords: phytoremediation , biomass , phytotoxicity , Brachiaria dictyoneura

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Abstract:

In this research has been evaluated, on a laboratory scale, the toxic effect of mercury on the root development and biomass growth of the Brachiaria dictyoneura species, with the goal of finding an adequate concentration interval for the study on the accumulation of Hg (II). Brachiaria dictyoneura seeds were exposed to different amounts of mercury, the germination kinetics were determined, and after a 20 day growth period the length of the roots and the biomass were measured. There were found harmful effects on the root development starting at 25 mg*kg-1 Hg (II); for the dry biomass the differences were found starting at 5 mg*kg-1 Hg (II) and starting at 75 mg*kg-1 Hg (II) for the seed emergency time, therefore, working with concentrations not exceeding 25 mg Hg(II)*kg-1 of substrate is suggested.

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