Abstract
SUMMARYA comparative study on the effects of photon flux density and spectral quality on photosynthesis and respiration in the marine red alga Porphyra yezoensis Ueda was conducted using a light dispenser. Results showed that the photosynthetic response, expressed in light utilization efficiency (LUE) for preselected wave bands of photosynthetically active radiation, could be ranked as follows: white > green > red > blue. Differences in LUE were also found between conchocelis and gametophyte stages and different strains of the alga. Pre‐illumination light compensation, post‐illumination light compensation, light saturation, respiration and photorespiration were also measured and compared. The relationships between light exposure, photosynthetic capacity, and the natural environmental conditions are discussed.
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