Responses of Porphyra linearis (Rhodophyta) to environmental factors under controlled culture conditions |
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Authors: | Shlomit Katz Ziv Kizner Zvy Dubinsky Michael Friedlander |
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Affiliation: | (1) Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan, 52900, Israel;(2) Faculty of Life Science & Departments, Bar-Ilan University, Ramat-Gan, 52900, Israel;(3) Israel Oceanographic and Limnological Research Ltd, National Institute of Oceanography, P.O. Box 8030, Haifa, 31080, Israel |
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Abstract: | The effect of environmental parameters on the growthof Porphyra linearis gametophytes was examinedunder controlled conditions, and related to themultilinear regression growth model recently developedfor this seaweed under coastal conditions in theeastern Mediterranean. Growth chambers, a gradienttable, special culture devices and analytical methodswere combined for this culture study.The major factors significantly controlling thegrowth rate of the P. linearis gametophytein glass dishes were: photoperiod, temperature, agein culture, photosynthetic photon flux (PPF), salinityand water dynamics. Maximal growth occurred underdaylength of 12 h, medium temperature (15–20 °C), low PPF (70–140 mol photon m-2s-1), ambient salinity (30–40 ppt), 1–3 h ofdaily air exposure, and water velocity of 4 cm s-1.Photosynthesis and respiration rates weredominantly affected by daylength and temperature,while the concentration of pigments was dominantlyaffected by PPF and temperature.These conditions correspond well to the optimalnatural growth environment of this local species andare in agreement with the optimum estimated throughthe recently developed outdoor mathematical growthmodel. |
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Keywords: | desiccation growth growth model inorganic carbon nutrients photoperiod photosynthesis pigments Porphyra linearis PPF respiration temperature water velocity |
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