| 초록 |
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 ${ times}$ irradiances, and a single factor of irradiances, salinities, daylength and nutrients (nitrogen, phosphorus). Zoospore release was maximal under condition of $20^{ circ}C{ times}100{ mu}mol ;photons ;m^{-2}s^{-1}$ in a factorial experiment (temperatures ${ times}$ irradiances), at $100{ mu}mol ;photons ;m^{-2}s^{-1}$ in irradiance experiment and at 34 psu in salinity conditions. After 24 days in culture, germling growth was maximal at $25^{ circ}C{ times}100{ mu}mol ;photons ;m^{-2}s^{-1}$ in temperatures ${ times}$ 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 $50{ mu}M ;{PO_4}^{3-}$ and $40{ mu}M ;{NH_4}^+$ . Germling growth was more effective under nitrogen addition than phosphorus addition in culture. In conclusion, optimal environmental conditions for zoospore release were $20^{ circ}C$ , $100{ mu}mol ;photons ;m^{-2}s^{-1}$ , and 34 psu. In addition, the optimal germling growth was observed at $25^{ circ}C$ , $100{ mu}mol ;photons ;m^{-2}s^{-1}$ , 34 psu, 16 h, $50{ mu}M ;({PO_4}^{3-})$ and $40{ mu}M ;{(NH_4}^+)$ . |
