Seasonal changes in the chlorophyll content and quantum efficiency of the moss Brachythecium rutabulum |
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Abstract: | AbstractThe concentration of chlorophyll a, b, and total chlorophyll have been monitored on a seasonal basis in Brachythecium rutabulum. Total chlorophyll increases during summer full canopy conditions from 1.70 mg chl g?1 on 8 May to 11.1 mg chl g?1 on 11 October. Photosynthetic-illumination curves show that during this period light saturation declines from 200 μmol m?2s?1 to 30 μmol m?2s?1 by 6 July, and light compensation falls dramatically from 65 μmol m?2s?1 to 4 μmol m?2s?1. The data also appear to support the conclusion that there is concurrently an increase in the density of photosynthetic units by the end of September. |
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