녹조류 실염주말의 유주자 방출과 배아생장에 미치는 환경요인의 영향
Effects of Environmental Factors on the Zoospore Release and Germling Growth of the Green Macroalga Chaetomorpha linum
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Effects of environmental factors on the zoospore release and germling growth of Chaetomorpha linum were examined. Zoospore release and germling growth experiments were carried out under a combination of temperatures × irradiances, and a single factor of irradiances, salinities, daylength and nutrients (nitrogen, phosphorus). Zoospore release was maximal under condition of 20oC × 100 μmol photons m−2s−1 in a factorial experiment (temperatures × irradiances), at 100 μmol photons m−2s−1 in irradiance experiment and at 34 psu in salinity conditions. After 24 days in culture, germling growth was maximal at 25oC × 100 μmol photons m−2s−1 in temperatures × irradiances and at normal seawater (34 psu) in salinity. Germling growth is faster at higher irradiance under same temperature condition and it increased with increasing daylengths (8−16 h). Chaetomorpha linum grew in wide range of N and P concentrations. The growth of germling was maximal at 50 μM PO4 3− and 40 μM NH4 +. Germling growth was more effective under nitrogen addition than phosphorus addition in culture. In conclusion, optimal environmental conditions for zoospore release were 20oC, 100 μmol photons m−2s−1, and 34 psu. In addition, the optimal germling growth was observed at 25oC, 100 μmol photons m−2s−1, 34 psu, 16 h, 50 μM (PO4 3−) and 40 μM (NH4 +).
Abstract
Effects of environmental factors on the zoospore release and germling growth of Chaetomorpha linum were examined. Zoospore release and germling growth experiments were carried out under a combination of temperatures × irradiances, and a single factor of irradiances, salinities, daylength and nutrients (nitrogen, phosphorus). Zoospore release was maximal under condition of 20oC × 100 μmol photons m−2s−1 in a factorial experiment (temperatures × irradiances), at 100 μmol photons m−2s−1 in irradiance experiment and at 34 psu in salinity conditions. After 24 days in culture, germling growth was maximal at 25oC × 100 μmol photons m−2s−1 in temperatures × irradiances and at normal seawater (34 psu) in salinity. Germling growth is faster at higher irradiance under same temperature condition and it increased with increasing daylengths (8−16 h). Chaetomorpha linum grew in wide range of N and P concentrations. The growth of germling was maximal at 50 μM PO4 3− and 40 μM NH4 +. Germling growth was more effective under nitrogen addition than phosphorus addition in culture. In conclusion, optimal environmental conditions for zoospore release were 20oC, 100 μmol photons m−2s−1, and 34 psu. In addition, the optimal germling growth was observed at 25oC, 100 μmol photons m−2s−1, 34 psu, 16 h, 50 μM (PO4 3−) and 40 μM (NH4 +).
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