• Title/Summary/Keyword: chlorophyll fluorescence partameters

Search Result 1, Processing Time 0.012 seconds

Antioxidative Enzyme Activities and O-J-I-P Transients of Crinum asiaticum var. japonicum $B_{AK}$. Leaves under Winter Stress (겨울철 저온스트레스에 의한 문주란 잎의 항산화효소 활성과 O-J-I-P 곡선 패턴)

  • Oh Soonja;Koh Seok Chan
    • Korean Journal of Environmental Biology
    • /
    • v.23 no.2 s.58
    • /
    • pp.206-213
    • /
    • 2005
  • The diurnal and seasonal variations of antioxidative enzyme activity and the O-J-I-P transients were investigated from the leaves of Crinum asiaticum var. japonicum under winter stress in natural habitat, in order to diagnose quantitatively physiological states of plants under stresses. The activities of superoxide dismutase and peroxidase increased slightly in winter. Especially, peroxidase acitivity was higher at dawn and night in winter and some isoforms were detected only in early winter. In the O-J-I-P transients, the fluorescence intensity of J, I, P steps decreased significantly in winter season, contrary to its high value in summer season. Of the chlorophyll fluorescence parameters derived from the O-J-I-P transients, Fm and $\Phi_{po}$ decreased with the increase of ABS/RC depending on temperature drop in winter.