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Agricultura Técnica

versión impresa ISSN 0365-2807

Resumen

IANNACONE O., José  y  ALVARINO F., Lorena. Ecotoxicological Effects of Three Heavy Metals on the Root Growth of Four Vascular Plants. Agric. Téc. [online]. 2005, vol.65, n.2, pp.198-203. ISSN 0365-2807.  http://dx.doi.org/10.4067/S0365-28072005000200009.

Environmental risk assessment (ERA) of terrestrial environments polluted by heavy metals in Peru requires standardized biological organisms, the use of which is simple, practical, sensitive and repeatable, such as seeds of higher plants used in eco-toxicological bioassays. The aim of this research was to evaluate the phytotoxic effects of Cr6+, Hg2+ and Pb2+ as potassium dichromate (K2Cr207), mercury chloride (Cl2Hg) and lead acetate ((CH3C00)2Pb), respectively, on growing roots of four species of higher terrestrial plants: onions (Allium cepa L., Liliaceae), red beets (Beta vulgaris L., Chenopodiaceae), rice (Oriza sativa L., Poaceae) and radishes (Raphanus sativus L., Brassicaceae) at 192 h (8 days) exposure. Bioassays of static sub-lethal toxicity for each metal and for each species of plant were performed, using a randomized complete block design: six concentrations and eight replicates with 240 seeds for each bioassay. The sequence in ascending order for mean inhibition concentration (IC50 in mg L-1) on root growth at 192 h exposure in the majority of cases was: Hg2+ > Cr6+> Pb2+. The perspectives of use for evaluation of soils contaminated by heavy metals in Peru are analyzed.

Palabras clave : heavy metals; Peru; seeds; vascular plants; seeds; mining waste; chromium; mercury; lead.

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