Effect of temperature on cell growth and production of transparent exopolymer particles by the diatom Coscinodiscus granii isolated from marine mucilage |
| |
Authors: | Tsuyoshi Fukao Katsunori Kimoto Yuichi Kotani |
| |
Institution: | (1) Seikai National Fisheries Research Institute, Fisheries Research Agency, 1551-8 Taira-machi, Nagasaki-shi Nagasaki, 851-2213, Japan;(2) Present address: Faculty of Agriculture, Kagawa University, Miki-cho, Kita-gun Kagawa, 761-0795, Japan |
| |
Abstract: | In the autumn of 2007, marine mucilage caused by the diatom Coscinodiscus granii occurred in the central area of Ariake Sound, Japan, and resulted in damage to fishery. To elucidate the mechanism underlying
the outbreak of marine mucilage, we examined the effect of temperature on cell growth and production of transparent exopolymer
particles (TEPs) in a culture of this species. Growth and TEP production of C. granii are influenced by temperature. The maximum growth rate (1.63 divisions day−1) and cell yield (1,280 cells mL−1) at all temperatures were obtained at 30°C. Optimal growth rates (>1.15 divisions day−1: ca. 70% of maximum) and cell yield (>900 cells mL−1: ca. 70% of maximum) were observed at temperatures of 25–30°C. TEP production by C. granii depended on whether volume- or cell-related values were considered. The maximum volume-normalized increase rates and concentrations
of TEP at all temperatures were observed at 25°C. However, when production rates and concentrations of TEP were normalized
to cell numbers, optimal values were measured at 10–15°C. In Ariake Sound, when marine mucilage caused by C. granii occurred, the temperature ranged from 25.0 to 25.4°C. This suggests that growth conditions of C. granii are important factors for production of marine mucilage. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|