Some effects of humidity on the light reaction of photosynthesis in the lichens Cladonia impexa and Collema flaccidium [fluorescence, luminescence]
1980
Sigfridsson, B. (Lund Univ. (Sweden). Dept. of Plant Physiology)
Luminescence and fluorescence were measured at different relative humidities in the lichen Cladonia impexa Harm. Both parameters showed a constant value at relative humidities lower than 80 per cent; thereafter they increased. Low relative humidity was found to decrease energy transfer from chlorophyll b to chlorophyll a, inhibit electron transport, lower electron holding capacity on the reduced side of photosystem two and impair far-red-induced afterglow, reflecting photophosphorylation. In Collema flaccidium Ach. Ach. energy transfer from the accessory pigments phycocyanin and phycoerythrin to chlorophyll a was only possible at high relative humidity. The results are interpreted as due to conformational changes caused by changed water content in the lichen.
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