Bioaccumulation of 60Co2+ ions in tobacco plants

Tobacco has previously been used in investigations of metals and radionuclide uptake. This study presents determination bioaccumulation translocation 60Co2+ ions tobacco plants (Nicotiana tabacum L.) grown Hoagland’s nutrient solution. Cobalt concentration increased with increasing Bioaccumulation from the initial C0 = 0.96 μM Co reached 90% after 7 day cultivation. Only small amounts accumulated roots, up to 2 - 4 % were removable roots by washing 0.1 M CoCl2, indicating that this portion is bound root surface ion-exchangeable form. retained approximately 2/3 cobalt 1/3 was transported shoots. Autoradiography revealed 60Co preferentially localized younger leaves. Prolongation cultivation time did not change [Co]roots : [Co]shoots ratio significantly. Relationships between growth rate, transpiration uptake distribution plant tissue are discussed.