Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Photochemical Efficiency and psbA Gene Expression of Crinum Leaves under Natural Environmental Stress in Winter

겨울철 저온스트레스에 의한 문주란의 광합성효율과 psbA 유전자의 발현양상

  • 오순자 (제주대학교 생명과학과ㆍ기초과학연구소) ;
  • 고석찬 (제주대학교 생명과학과ㆍ기초과학연구소)
  • Published : 2004.04.01
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Abstract

The change of chlorophyll fluorescence parameters, O-J-I-P transients and psbA gene expression were investigated in the leaves of Crinum asiaticum var. japonicum on the natural condition in winter, in order to elucidate physiological responses of photosystem II (PS II) activity to winter stresses. The photochemical efficiencies of PS II, Fv/Fm, were significantly low in winter, contrary to its high value in summer. The values of I -qN and I-qP were lower in midday than at dawn or night both in summer and winter, although their decrease in midday was less in winter than in summer. In the O-J-I-P transients, the fluorescence intensity of J, I, P-step decreased remarkably depending on temperature drop in winter. And the D I reaction center protein of PS II decreased in late winter more than in early winter, concomitantly with relatively high content of description products of psbA gene in midday. These results indicate that low temperature in winter causes irreversible damage to PS II and subsequently leads to cell death.

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References

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