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The Korean Society of Phycology (한국조류학회(藻類))
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Characteristics of Organic Substances Produced from Cochlodiniumpolykrikoides (Dinophyceae)

Cochlodinium polykrikoides(Dinophyceae)에서 분비되는 유기물질의 특성

  • Kang, Yang-Soon (Marine Harmful Organism Research Team, National Fisheries Research & Development Institute) ;
  • Kwon, Jung-No (Research Planning Team, National Fisheries Research & Development Institute) ;
  • An, Kyoung-Ho (Marine Harmful Organism Research Team, National Fisheries Research & Development Institute)
  • 강양순 (국립수산과학원 유해생물팀) ;
  • 권정노 (국립수산과학원 연구기획팀) ;
  • 안경호 (국립수산과학원 유해생물팀)
  • Published : 2006.06.30
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Abstract

Organic substances are released from phytoplankton cells during all phases of growth. The type and amounts of organic substance excreted and the effects of nutrient limitation are often highly species-specific. Dinoflagellate, Cochlodinium polykrikoides grown in batch culture produced an exopolysaccharide. Exopolysaccharide and intracellular polysaccharide concentrations increased as C. polykrikoides cultures progressed from exponential phase, through stationary phase, to declining phase. In the exponential phase, the concentration of exopolysaccharide was relatively low, but in the stationary phase, it showed a rapid increase which seemed to coincide with the depletion of nitrate from the medium. Of the 20 amino acids analyzed, proline dominated in the organic matter of all cultures ranging from 48.2 to 79.9 nmol L–1, and constituting the 20-90% of total amino acids, and followed by histamine varying from 0.7 to 47.5 nmol L–1. Leucine and cysteine were also abundant in the stationary phase. The release rates of exopolysaccharide and intracellualr polysaccharide were higher the end of stationary phase than in the exponential phase. Exopolysaccharide concentration per cell was more than two times higher during the end of stationary phase than that in exponential phase. C. polykrikoides produced extracellular polysaccharide at a rate of 47.04 pg cell–1 day–1.

Keywords

References

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