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Original Articles

Tolerance of Two Hydroponically Grown Salix Genotypes to Excess Zinc

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Pages 1471-1482 | Received 10 Jan 2006, Accepted 25 Oct 2006, Published online: 17 Sep 2007
 

ABSTRACT

Woody cuttings from two Salix genotypes (genotype I—clone LUC-31, Salix alba and genotype II- clone STOTT, Salix viminalis) were grown hydroponically for 14 days at increasing concentrations of Zn: control, 50, 100 or 150 μ M Zn. Genotype tolerance to excess zinc (Zn) was evaluated using a root elongation test. The changes in growth, Zn, iron (Fe), copper (Cu) and manganese (Mn) concentrations as well as photosynthetic performance were used as additional evaluation criteria. Photosynthetic pigments concentrations in Zn-exposed cuttings of genotype II decreased as compared with genotype I, which corresponded well with the higher leaf Zn accumulation, decreased Fe concentrations as well as lowered photosynthetic rate. Based on the indicators used, genotype I (Salix alba) was classified as more tolerant to excess Zn than genotype II (Salix viminalis).

ACKNOWLEDGEMENT

The Belgium OSTC (Belspo) programme providing a postdoctoral grant to Andon Vassilev is acknowledged.

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