Effects of pH and nitrogen on cadmium uptake in potato |
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Authors: | E. H. Larsson Jönsson H. Asp |
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Affiliation: | 1. Department of Biosystems and Technology, Swedish University of Agricultural Sciences, Box 103, SE-230 53, Alnarp, Sweden
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Abstract: | This study investigated the effects of pH and nitrogen form and concentration on cadmium (Cd) uptake by potato (Solanum tuberosum L.) grown in hydroponic culture. Potato plants grown in a pH-buffered nutrient solution for 10 d were exposed for 24 h to 25 nM CdCl2 labelled with 109Cd. Plants showed a significantly higher Cd uptake and accumulation at pH 6.5 than at pH 4.5 and 5.5. Nitrogen supplied as nitrate (NO3 ?) generally resulted in a higher Cd uptake and accumulation than N supplied as ammonium (NH4 +). This effect was most pronounced at pH 6.5. The N concentration increasing from 6.5 to 26 mM resulted in a decreased Cd influx when either NO3 ? or NH4 + was used. Cd translocation to the shoot was increased when NO3 ? was used as the sole N source. In conclusion, pH had a strong influence on Cd uptake by roots and N form is especially important for Cd translocation within the potato plant. |
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