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The purpose of this study is to investigate growth response and toxigenicity under various temperature and nutritional conditions, in order to understand the physioecological characteristics of Aphanizomenon flos-aquae, which is a bloom-forming cyanobacterium in the Nakdong River. The strain was inoculated into media under combinations of four temperatures (4, 12, 21, $30^{\circ}C$) and three nutrients (modified CB medium, P-depleted CB medium, N-depleted CB medium) for 28 days. The algae-inhibition tests were performed to assess the potential allelopathic effects of the strains' filtrates on the growth of four algae strains (Microcystis aeruginosa, Aulacoseria ambigua f. spiralis, Aphanizomenon flos-aquae, Scenedesmus obliquus). Toxin production of a strain was measured by Enzyme-Linked ImmunoSolbent Assay (ELISA). The optimal growth temperature (Topt) of strains was $19.9^{\circ}C$ ($18.3-21.2^{\circ}C$), and the temperature range for growth was from $-0.3^{\circ}C$ to $34.3^{\circ}C$. Specific growth rate (${\mu}$) in modified CB medium varied from 0.10 to $0.16day^{-1}$, and the maximum growth rate (${\mu}_{max}$) was $0.17day^{-1}$. Although growth curves under N-existed and N-depleted conditions were almost the same, growth under N-depleted condition was relatively slowed (${\mu}=0.09$ to $0.14day^{-1}$), with a decreased maximum cell density. However, growth under the P-depleted condition was restricted for all temperatures, Two stains of Aphanizomenon flos-aquae were confirmed as not producing toxins, because saxitoxin and cylindrospermopsin were not detected by ELISA. The exudates or filtrates from the Aphanizomenon flos-aquae (DGUC003) resulted in significant inhibition of algal growth on the Aulacoseira ambigua f. spiralis (DGUD001) and Aphanizomenon flos-aquae (DGUC001) (p < 0.01).
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참고문헌 (42)
참고문헌 신청
Ballot, A. / 2010 / First Report of Anatoxin-a-Producing Canobacterium Aphanizomenon issatschenkoi in Northeastern German / Toxicon 56(6):964~971
Ballot, A. / 2010 / Paralytic Shellfish Poisoning Toxin-Producing Cyanobacterium Aphanizomenon gracile in Northest Germany / Applied and Environmental Microbiology 76(4):1173~1180
Beakes, G. / 1988 / Zoospores. Ultrastructure of Zygorhizidium affluens Canter and Z. planktonicum Canter, Two Chytrids Parasitizing the Diatom Asterionella formosa Hassall / Canadian Journal of Botany 66:1054~1067
Berry, J. P. / 2008 / Cyanobacterial Toxins as Allelochemicals with Potential Applications as Algaecides, Herbicides and Insecticides / Marine Drugs 6:117~146
Bláhová, L. / 2009 / The First Occurrence of the Cyanobacterial Alkaloid Toxin Cylindrospermopsin in the Czech Republic as Determined by Immunochemical and LC/MS methods / Toxicon 53:519~524
Ballot, A. / 2010 / Paralytic Shellfish Poisoning Toxin-Producing Cyanobacterium Aphanizomenon gracile in Northest Germany / Applied and Environmental Microbiology 76(4):1173~1180
Beakes, G. / 1988 / Zoospores. Ultrastructure of Zygorhizidium affluens Canter and Z. planktonicum Canter, Two Chytrids Parasitizing the Diatom Asterionella formosa Hassall / Canadian Journal of Botany 66:1054~1067
Berry, J. P. / 2008 / Cyanobacterial Toxins as Allelochemicals with Potential Applications as Algaecides, Herbicides and Insecticides / Marine Drugs 6:117~146
Bláhová, L. / 2009 / The First Occurrence of the Cyanobacterial Alkaloid Toxin Cylindrospermopsin in the Czech Republic as Determined by Immunochemical and LC/MS methods / Toxicon 53:519~524
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