The effects of nickel were studied in two serpentine species with different metal tolerance strategies: Silene italica L., which limits nickel uptake and translocation, and Alyssum bertolonii Desv., a serpentine endemic, which accumulates nickel mostly in the leaves. In S. italica, nickel 7.5#M inhibited root growth and depressed mitotic activity in root tips. Peroxidase activity and phenol concentration both in roots and shoots were increased; under the same conditions nickel did not produce any relevant effect on A. bertolonii. In S. italica an adequate calcium concentration (25 mM) was able to reverse the effects of nickel on root growth and metabolism. In A. bertolonii the same calcium concentration reduced root growth, confirming this species adaptation also to low calcium concentrations, typical of serpentines.
Comparison of two serpentine species with different nickel tolerance strategies.
PANDOLFINI, Tiziana;
1990-01-01
Abstract
The effects of nickel were studied in two serpentine species with different metal tolerance strategies: Silene italica L., which limits nickel uptake and translocation, and Alyssum bertolonii Desv., a serpentine endemic, which accumulates nickel mostly in the leaves. In S. italica, nickel 7.5#M inhibited root growth and depressed mitotic activity in root tips. Peroxidase activity and phenol concentration both in roots and shoots were increased; under the same conditions nickel did not produce any relevant effect on A. bertolonii. In S. italica an adequate calcium concentration (25 mM) was able to reverse the effects of nickel on root growth and metabolism. In A. bertolonii the same calcium concentration reduced root growth, confirming this species adaptation also to low calcium concentrations, typical of serpentines.
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