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Rivista di Biologia Molecolare e Biotecnologie

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Minerva Biotecnologica 2001 June;13(2):97-101

lingua: Inglese

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.

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