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Cu-, Zn- und Cd-Aufnahme von Lupinus albus L., Lupinus angustifolius L. und Lupinus luteus L. im Vergleich zu Lolium multiflorum Lam

  • Komi Egle
  • Wilhelm Römer
Chapter

Abstract

Under P deficiency several lupin species exude organic acids which increase the solubility of phosphate and cations. However, most monocotyledons mostly are missing this property. It was the aim of this study to investigate the Cu, Zn and especially the Cd uptake of six cultivars of Lupinus albus, Lupinus angustifolius and Lupinus luteus in comparison to that of Lolium multiflorum (one cultivar) at a moderate P supply in a pot experiment (6 kg soil/pot). We used a humic podzol with the following characteristics: 6 % clay, 11 % silt, 84 % sand, 4.9 % organic substance, þH (CaCl2): 5.4, lactate soluble P: 32 mg/kg, HNO3/HCl soluble: Cu 2.4; Zn: 10 and Cd: 0.1 mg/kg. Fourteen days before sowing, heavy metals were added per kg soil as follows: 30 mg Cu, 75 mg Zn, 0.5 mg Cd and other nutrients: 66 mg K, 13 mg Mg as well as 66 mg N for ryegrass. For lupin, the soil was inoculated with rhizobia. After 3o and 42 days the shoot dry matter, the Cu, Zn and Cd contents in the shoots and roots and the root length were measured. The inflow (net uptake rate per unit root length) based on Cd amounts of the total plants (total inflow) or based on Cd amounts of shoots only (shoot inflow) were calculated as well as the root length/shoot weight ratio.

L. albus showed the lowest Cu, Zn and Cd concentration of shoots. The Cd content of blue lupin was four times, of yellow lupin five times and of ryegrass ten times higher than that of white lupin (0.2 ppm). The high Cd content of ryegrass may be mainly caused by the ten times higher root/shoot ratio in comparison to that of lupins. The low Cd content especially of white lupin shoot was not owing to a low total inflow (it was six times higher than that of ryegrass), but was due to a low Cd translocation from the roots into the shoots (L. albus: 4...5 %, L. angustifolius 12...23 %, L. luteus 24...27 %, Lolium 29 %). The translocation rates for Zn are : L. albus 37 %, L. angusti folius.61 %, L. luteus 68 %, Lolium56 % and for Cu: 43, 44, 52 and 34 % respectively. The high Cd retention capacity of lupin roots may be caused by high Cd sorption in apparent free space and/or complexation by low molecular organic anions in cortex cells.

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Copyright information

© B. G. Teubner GmbH, Stuttgart/Leipzig/Wiesbaden 2001

Authors and Affiliations

  • Komi Egle
    • 1
  • Wilhelm Römer
    • 1
  1. 1.Institut für AgrikulturchemieGeorg-August-Universität GöttingenGöttingen

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