Contribution to the biosystematic and ecological study of the orophilic complex Carex sempervirens Vill. (Cyperaceae) . Ecophysiological characterization of the populations

Lazare, J.J.

Pirineos 36(127): 73-117


ISSN/ISBN: 0373-2568
Accession: 001554026

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European populations of C. sempervirens were examined for germination, mineral nutrition and resistance to foliar dehydration. High altitude adversely affected germination. Populations of subsp. sempervirens and subsp. pseudotristis responded differently to light. Most populations from the Alps displayed germination behaviour different from that of other populations in that little or no germination occurred in seeds collected in any year despite all attempts to break dormancy or remove inhibitors. The subsp. pseudotristis would only grow on lime-free soils at pH 4-6 whereas subsp. sempervirens grew on soils with surface pH of 6-9. Supplying Ca to plants growing in solution culture resulted in considerable changes in the fatty acid composition of the roots of subsp. sempervirens but not in subsp. pseudotristis. Excised leaves of C. sempervirens and C. bulgarica transpired similarly at high atmospheric RH, but at low RH those of C. bulgarica transpired most and those of C. sempervirens subsp. sempervirens least. Both subsp. of C. sempervirens showed increased transpiration under severe desiccation and the apical half of the leaf died.