Effects of light photon flux density and spectral quality on photosynthesis and respiration in Porphyra yezoensis (Bangiales, Rhodophyta) |
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| Authors: | Xuecheng Zhang,Eric Brammer,Marianne Pedersé n,Xiuging Fei |
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| Affiliation: | College of Marine Life Sciences, Ocean University of Qingdao, Qingdao 266003, People's Republic of China;Illuminova AB, Box 23051, S-75023, Uppsala, Sweden;Department of Physiological Botany, Uppsala University, S-75236, Uppsala, Sweden;Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, People's Republic of China |
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| Abstract: | A 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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| Keywords: | Light compensation light saturation light utilization efficiency photorespiration photosynthesis Porphyra yezoensis respiration |
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