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- Title
Interactions of blue light and inorganic carbon supply in the control of light-saturated photosynthesis in brown algae.
- Authors
Forster, R. M.; Dring, M. J.
- Abstract
Photosynthetic capacities of five species of brown algae in red light were found to be strongly limited by the inorganic carbon supply of natural sea water, Under these conditions, pH 8.2 and dissolved inorganic carbon concentration (DIC) of 2.1 mol m-3, a short pulse of blue light was found to increase the subsequent rate of photosynthesis in saturating red light. The degree of blue light stimulation varied between species, ranging from an increase of over 200% of the original rate in <em>Colpomenia peregrina</em> to only 10% in <em>Dictyota dichotoma</em>. Increasing the DIC concentration of sea water by bicarbonate addition resulted in carbon saturation of photosynthesis in all five species. Blue light stimulation was greatly reduced at these higher DIC concentrations. The response in <em>Laminaria digitata</em> was examined in more detail by manipulation of pH and DIC to produce solutions with different concentrations of dissolved CO2. At a CO2 concentration typical of normal sea water (12.4 mmol m-3), blue light treatment increased Photosynthetic rate by approximately 50%. Blue light stimulation was increased to over 150% at CO2 concentrations below that of sea water, whereas at concentrations above that of sea water, the effect was diminished. Therefore, the effect of blue light on photosynthetic capacity appears to involve an increase in the rate of supply of carbon dioxide to the plant.
- Subjects
BLUE light; BROWN algae; PHOTOSYNTHESIS; PHYSIOLOGICAL effects of blue light; EFFECT of blue light on plants; EFFECT of carbon on plants; ALGAE; PLANT physiology
- Publication
Plant, Cell & Environment, 1992, Vol 15, Issue 2, p241
- ISSN
0140-7791
- Publication type
Article
- DOI
10.1111/j.1365-3040.1992.tb01478.x