Heathcote C A, Davies M S, Etherington J R
Department of Plant Science, University College Cardiff, PO Box 78, Cardiff CF1 1XL, UK.
New Phytol. 1987 Mar;105(3):381-391. doi: 10.1111/j.1469-8137.1987.tb00875.x.
Nine populations of Carex flacca Schreb., collected from sites which vary widely in their liability to soil flooding, were grown on an experimental soil with free drainage, transient flooding or continuous flooding for 26 weeks. Although the flooding treatments resulted in low redox potentials and high concentrations of reduced iron and manganese in the soil, the growth of C. flacca plants was little affected by flooding. All populations grew equally well on the flooded soils. All populations produced adventitious roots at the soil surface in the flooded treatments; these were absent from plants grown on the freely drained soil. Flooding produced an increase in the manganese concentration of roots and shoots but, although the iron content of roots was markedly increased by flooding, there was no increased transport to the shoots. In view of the absence of detectable phenotypic differentiation between these populations from widely contrasting sites and their unimpaired growth on severely waterlogged soils, it is argued that C. flacca plants have a broad tolerance (phenotypic flexibility) of soil flooding. This may be important in the wide ecological amplitude of this species.
从土壤易涝程度差异很大的地点采集了9个柔苔草种群，将它们种植在具有自由排水、短暂淹水或持续淹水条件的试验土壤中，为期26周。尽管淹水处理导致土壤氧化还原电位较低，还原态铁和锰的浓度较高，但柔苔草植株的生长几乎未受淹水影响。所有种群在淹水土壤上生长得同样良好。在淹水处理中，所有种群在土壤表面都长出了不定根；而在自由排水土壤上生长的植株则没有不定根。淹水使根和地上部分的锰浓度增加，不过，尽管淹水使根中的铁含量显著增加，但向地上部分的转运并未增加。鉴于来自差异很大地点的这些种群之间未检测到表型分化，且它们在严重渍水土壤上生长未受影响，有人认为柔苔草植株对土壤淹水具有广泛的耐受性（表型可塑性）。这在该物种广泛的生态幅度中可能很重要。
