Comparison of two serpentine species with different nickel tolerance strategies |
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Authors: | Poberto Gabbrielli T. Pandolfini O. Vergnano M. R. Palandri |
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Affiliation: | (1) Dipartimento di Biologia Vegetale, Italia;(2) Laboratorio di Fisiologia, Italia;(3) Laboratorio di Botanica Generale, Università di Firenze, Via Micheli 1, I-50121 Firenze, Italia |
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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, andAlyssum bertolonii Desv., a serpentine endemic, which accumulates nickel mostly in the leaves. InS. italica, nickel 7.5 μM 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 onA. bertolonii. InS. italica an adequate calcium concentration (25 mM) was able to reverse the effects of nickel on root growth and metabolism. InA. bertolonii the same calcium concentration reduced root growth, confirming this species adaptation also to low calcium concentrations, typical of serpentines. |
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Keywords: | Alyssum bertolonii Desv. nickel tolerance peroxidase phenols root growth serpentine Silene italica L. |
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