Root surface phosphatase activity and P nutrition in the presence of Ni2+ was studied in Alyssum bertolonii DESV., a Ni-accumulating species of Tuscan serpentine soils. Increasing external concentrations of inorganic phosphate reduced phosphatase activity. In the presence of an inhibiting concentration of inorganic phosphate, Ni2+ stimulated phosphatase activity of seedlings treated for seven days but did not affect root P content. Root surface phosphatase showed a higher activity towards phytate in comparison with other P organic substrates. Increased P levels were detected in the roots of Ni-treated seedlings supplied with phytate. We discuss the possible physiological role of root cell wall phosphatases, which in this study was shown to be tolerant to Ni2+.
Physiological role of root surface phosphatases in adaptation strategies of Alyssum bertolonii Desv. to serpentine edaphic conditions.
PANDOLFINI, Tiziana;
1995-01-01
Abstract
Root surface phosphatase activity and P nutrition in the presence of Ni2+ was studied in Alyssum bertolonii DESV., a Ni-accumulating species of Tuscan serpentine soils. Increasing external concentrations of inorganic phosphate reduced phosphatase activity. In the presence of an inhibiting concentration of inorganic phosphate, Ni2+ stimulated phosphatase activity of seedlings treated for seven days but did not affect root P content. Root surface phosphatase showed a higher activity towards phytate in comparison with other P organic substrates. Increased P levels were detected in the roots of Ni-treated seedlings supplied with phytate. We discuss the possible physiological role of root cell wall phosphatases, which in this study was shown to be tolerant to Ni2+.
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