Phitotoxicity of crhomium over Phaseolus vulgaris L.

Abstract

Heavy metals contamination and the problems that these generate on the biota have been documented. Chromium is a heavy metal that is not free in nature. It is important determine the level of heavy metals environmental risk on diverse terrestrial ecosystem using ecotoxicological bioassays. The aims of this work is to evaluate the effect of different chromium concentrations on the growth of Phaseolus vulgaris L. That will not only offers information about anatomical variations on the species in study and will be ussefull in future experiments. They carried out germination trial with increasing doses of Cr: 0 (control), of 0.000001; 0.00001; 0.0001; 0.001; 0.01; 0.1; 0.15; 0.2; 0.25; 0.5; 0.75; 1; 1.5; and 2 M, the Cr is apllicated as potassium chromate, by establishing 7 repetitions of Phaseolus vugaris L. seeds for treatment. Groups of four seeds were used in plastic containers and put over filter paper in each replica.For 0; 0.1; 0.75 and 2 M concentrations we carrie out a test in gavels with soil and compost. Both test were carried out in a randomized design. ANVA analysis was maked to evaluate the effect of treatments.All the seeds germinated from concentrations of chromium over 10-2 M equivalent to 520 mg.L-1, this is a higher value that obtained in the bibliography. There were differences between treatments in the radicle and the stem length. The dose of 10-6 M could be the promoter growth of these two organs. There were no difference between the width and length of the leaves, this shows that the traslocación of the chromium in leaves was low. In gavels test the soil had not effect over Cr concentration and seeds have not germinated.