Abstract
The concentrations of chloroplast pigments were determined in current-year tissues of Sphagnum capillifolium (Ehrh.) Hedw. harvested at the end of the growing season in a bog in the southern Alps of Italy. Concentrations of both chlorophylls were highest in the midsummer segment. Concentrations of carotenoids were fairly stable, except in the spring segment, whereas chlorophyll derivatives (pheophytin, pheophorbide, and chlorophyllide) accumulated in the top segment, corre- sponding to the autumnal capitulum. This indicates a rapid degradation of chlorophyll, probably caused by nightly chilling, at the end of the growing season.
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