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 Cd-109. 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.

Keywords

ammonium; Cd accumulation and translocation; nitrate; Solanum tuberosum

Published in

Biologia Plantarum
2013, Volume: 57, number: 4, pages: 788-792
Publisher: SPRINGER

SLU Authors

• Larsson Jönsson, Helene

  • Department of Biosystems and Technology, Swedish University of Agricultural Sciences
    

• Asp, Håkan

  • Department of Biosystems and Technology, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Agricultural Science


Publication identifier

DOI: https://doi.org/10.1007/s10535-013-0354-9

Permanent link to this page (URI)

https://res.slu.se/id/publ/53073