Heavy-metal (Zn,Cd) tolerance in selected clones of duck weed (Lemna minor) |
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| Authors: | R F M Van Steveninck M E Van Steveninck D R Fernando |
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| Institution: | (1) School of Agriculture, La Trobe University, 3083 Bundoora, Australia;(2) Department of Botany, La Trobe University, 3083 Bundoora, Australia |
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| Abstract: | Cryo-microprobe analysis of quench-frozen fronds of a Zn-tolerant clone of Lemna minor exposed to a high level of Zn (300 μM) showed the presence of cellular deposits consisting of Zn, Mg, K and P or Zn, K and P (Zn phytate). The same Zn-tolerant clone of Lemna minor, when exposed to a high level of Cd (30 μM), showed the presence of globular deposits consisting of Cd, K and P in mature fronds, but the immature cells of the enclosed daughter fronds contained relatively large deposits with Cd and S as the main components (Cd-phytochelatin?). Selection for Zn tolerance in a population of Lemna minor was easily achieved but selection for Cd tolerance has so far not been successful. The Zn-tolerant clone also tolerates high levels of phosphate. |
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| Keywords: | cadmium clones heavy metal tolerance Lemna minor oxalate phosphate phytic acid phytochelatin sulphur X-ray microanalysis zinc |
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