Korean Journal of Environmental Biology (환경생물)

Korean Society of Environmental Biology (한국환경생물학회)
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Chlorophyll Fluorescence and Antioxidative Enzyme Activity of Crinum Leaves Exposed to Natural Environmental Stress in Winter

겨울철 자연환경에 노출된 문주란 잎의 엽록소형광과 항산화효소 활성에 관한 연구

  • 오순자 (제주대학교 생명과학과ㆍ기초과학연구소) ;
  • 고석찬 (제주대학교 생명과학과ㆍ기초과학연구소)
  • Published : 2004.03.01
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Abstract

Chlorophyll fluorescence and antioxidative enzyme activity were investigated from leaves of Crinum asiaticum var. japonicum under the natural condition in winter, in order to monitor plant response and physiological states such as vitality, productivity and so on. In the O-J-I-P transients, the fluorescence intensity of J, I, P-step decreased remarkably depending on temperature drop in winter. The photochemical efficiencies of PSII, Fv/Fm, were significantly low in late winter with decrease of Fm. These results indicate that Crinum plants were affected by seasonal drop of temperature. The catalase activity significantly decreased depending on temperature drop in winter. However, the activity of superoxide dismutase ascorbate peroxidase and peroxidase slightly increased in winter while some isoenzymes appeared in winter. These results, with the remarkable decrease of Ev/Fm in winter, represent that Crinum plants were exposed to oxidative stress and subsequently damaged leading to cell death.

겨울철 저온에 의한 식물의 반응 및 생리적 상태를 확인하기 위해 문주란(Crinum asiaticum var. japonicum)을 대상으로 엽록소형광과 항산화효소 찬성의 변화를 조사하였다. O-J-I-P곡선을 분석한 결과 겨울철에 J, I, P-단계에서의 형광세기가 현저하게 간소하였다. 문주란 잎의 광계II의 광화학적 효율, 즉 Fv/Fm은 겨울철의 온도변화 추이와 유사하게 낮은 값을 나타내어 겨울철 저온이 스트레스 요인으로. 작용하는 것으로 보인다. 그리고, 겨울철에 superoxide dismutase, ascorbate peroxidase, peroxidase 활성 이 다소 증가하였으나 catalase 활성은 여름철에 비하여 크게 낮았다. 이러한 결과는 겨울철의 Fv/Fm의 감소와 함께 문주란이 겨울철 저온에 의해 산화적 스트레스에 처해 있게되며 세포사멸이 일어나는 것으로 해석된다.

Keywords

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