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논문 상세정보

담수산 클로렐라(Chlorella vulgaris)의 수은 스트레스에 대한 엽록소형광 반응

Chlorophyll a Fluorescence Response to Mercury Stress in the Freshwater Microalga Chlorella Vulgaris

Abstract

The response of the freshwater microalga Chlorella vulgaris to mercuric ion ($Hg^{2+}$) stress was examined using chlorophyll a fluorescence image analysis and O-J-I-P analysis as a way to monitor the toxic effects of mercury on water ecosystems. The levels of photosynthetic pigments, such as chlorophyll a and b and carotenoids, decreased with increasing $Hg^{2+}$ concentration. The maximum photochemical efficiency of photosystem II(Fv/Fm) changed remarkably with increasing $Hg^{2+}$ concentration and treatment time. In particular, above $200{\mu}M\;Hg^{2+}$, considerable mercury toxicity was seen within 2 h. The chlorophyll a fluorescence transient O-J-I-P was also remarkably affected by $Hg^{2+}$; the fluorescence emission decreased considerably in steps J, I, and P with an increase in $Hg^{2+}$ concentration when treated for 4 h. Subsequently, the JIP-test parameters (Fm, Fv/Fo, RC/CS, TRo/CS, ETo/CS, ${\Phi}_{PO}$, ${\Psi}_O$ and ${\Phi}_{EO}$) decreased with increasing $Hg^{2+}$ concentration, while N, Sm, ABS/RC, DIo/RC and DIo/CS increased. Therefore, a useful biomarker for investigating mercury stress in water ecosystems, and the parameters Fm, ${\Phi}_{PO}$, ${\Psi}_O$, and RC/CS can be used to monitor the environmental stress in water ecosystems quantitatively.

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이 논문을 인용한 문헌 (1)

  1. Oh, Soonja ; Moon, Kyung Hwan ; Son, In-Chang ; Song, Eun Young ; Moon, Young Eel ; Koh, Seok Chan 2014. "Growth, Photosynthesis and Chlorophyll Fluorescence of Chinese Cabbage in Response to High Temperature" 원예과학기술지 = Korean journal of horticultural science & technology, 32(3): 318~329 

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