Abstract
Serpentine soils are hostile to plant life. They are dry, contain high concentrations of nickel and have an unfavorable calcium/magnesium ratio. The dioecious plant Silene dioica (L.) Clairv. (Caryophyllaceae) is the most common herb on serpentine soils in the Swedish mountains. It also commonly grows on non-serpentine soils in the subalpine and coastal area. I have compared the germination frequency, plant establishment and growth of serpentine and subalpine non-serpentine populations in serpentine soil under greenhouse conditions. Further more I have studied the specific effect of nickel on root and shoot growth of serpentine and non-serpentine plants from the subalpine and coastal area in solutions with different concentrations of nickel. Plants from serpentine and non-serpentine populations grew well and in a similar fashion in serpentine soil. Moreover, S. dioica plants, irrespective of original habitat, tolerated enhanced concentrations of nickel when grown in solutions. An analysis of metal content in serpentine plants from natural populations shows that S. dioica has a higher nickel concentration in the roots than in the shoots. The growth studies show that S. dioica is constitutively adapted to serpentine, and that all populations have the genetic and ecological tolerance to grow on serpentine.
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Westerbergh, A. Serpentine and non-serpentine Silene dioica plants do not differ in nickel tolerance. Plant Soil 167, 297–303 (1994). https://doi.org/10.1007/BF00007956
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DOI: https://doi.org/10.1007/BF00007956