The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY (한국해양학회지:바다)

The Korean Society of Oceanography (한국해양학회)
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Absorbance Spectrum for Mesodinium rubrum MR-MAL01, a marine photosynthetic ciliate, fed on Photo-adapted Cryptophyte

광적응된 은편모조류를 섭식한 해양 광합성 섬모류 Mesodinium rubrum MR-MAL01의 흡광스펙트럼

  • Published : 2003.02.01
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Abstract

Recent reports on the phagotrophic feeding of M. rubrum are based on cultivation experiments with novel isolates of this ciliate species from Gomso Bay, Korea. Photo-adapted cryptophyte(CR-MAL01) cultures at high light of 100 $\mu$mol photons m$^{-2}$ s$^{-1}$ (HL) and low light of 10 $\mu$mol photons m$^{-2}$ s$^{-1}$ (LL) were fed to M. rubrum (MR-MAL01) cultures under HL and LL conditions, respectively. Absorbance spectrum by LL M. rubrum showed the same peak at wavelengths around 542nm as that by LL cryptophyte prey, which was not showed in HL M. rubrum. This result supports the implication that light utilization and absorption pattern of M. rubrum population must depend on the status of photo-adaptation of the co-existing population of prey cryptophyte. Consequences of the present research results were discussed in relation to the function of the prey cryptophyte and phagotrophic M. rubrum in marine microbial ecosystem.

한국 서해의 곰소만에서 분리한 온대 해역 산 초유의 M. rubrum MR-MAL01 배양체가 확보되어, M. rubrum의 입자성 먹이 섭식 현상이 보고되었다. 100$\mu$mo1 photons m$^{-2}$ s$^{-1}$의 고광도(HL) 및 10 $\mu$mo1 photons m$^{-2}$ s$^{-1}$의 저광도(LL)에서 광 적응된 미동정 은편모조류 종주 CR-MAL01를 섭식한 M. rubrum의 HL및 LL적응 배양체의 흡광스펙트림을 분석하였다. LL에 적응된 은편모조류를 섭식하고 LL에 적응한 M. rubrum은 섭식 이전의 먹이 세포 흡광특성인 542nm부근의 황갈색 파장 범위에서 뚜렷한 흡광피크를 나타낸 반면, HL에 적응된 은편모조류를 섭식하고 HL에 적응한 M. rubrum은 이러한 흡광 피크를 보이지 않았다. 이는 M. rubrum세포가 자연환경에서 먹이로서 은편모조류 세포를 섭식하기 이전 이들의 광 적응 상태가 섭식 이후 M. rubrum의 광이용 효율 및 광흡수 특성 등을 결정짓는 주요 요인이 될 가능성을 시사한다. 본 연구 결과에 따라 예상되는 해양 미소생물 생태계 내에서 이들 섭식자 및 먹이생물 종의 역할에 대하여 논의하였다.

Keywords

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