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Rivista di Biologia Molecolare e Biotecnologie
Indexed/Abstracted in: EMBASE, Science Citation Index Expanded (SciSearch), Scopus
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BIOREMEDIATION - Part II
Minerva Biotecnologica 2001 Giugno;13(2):97-101
Uptake and translocation of cadmium in Brassicaceae
Quartacci M. F., Cosi E., Navari-Izzo F.
Dipartimento di Chimica e Biotecnologie Agrarie, Università degli Studi di Pisa, Pisa, Italy
Four species and related cultivars belonging to the Brassicaceae were examined to select those that, besides being more effective in the uptake and translocation of Cd, showed a higher tolerance to the metal as well. Germination tests performed on ten starting plants indicated that Brassica juncea cv Aurea and Raphanus sativus cvs Rimbo and Saxa were the ones showing both a germinability higher than 90% and the longest root length, thus they were chosen for the following experiments. In comparison with Saxa, cv Rimbo grown for 10 days in nutrient solutions containing increasing Cd concentrations (0-40 µM) showed a slightly lower metal content, but a higher translocation, whereas, compared to B. juncea cv Aurea, it produced higher biomass. Due to the reported results, the growth of R. sativus cv Rimbo at 0, 5, 10 and 15 µM Cd was followed for 28 days. The results showed that the tolerance index decreased at increasing metal levels, and that during the growth the roots were less sensitive to Cd toxicity. The ground and above ground biomass, even though increasing during time, suffered a reduction as the metal concentrations increased. As far as the metal content is concerned, Cd amount in the ground parts increased as the concentrations of the metal rised. The metal content showed a similar trend in the above ground parts as well. In conclusion, the results obtained allowed us to consider R. sativus cv Rimbo as the species more suitable, among those tested, for Cd phytoextraction.