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Antioxidative Enzyme Activities and O-J-I-P Transients of Crinum asiaticum var. japonicum $B_{AK}$. Leaves under Winter Stress  

Oh Soonja (Department of Life Science & Research Institute for Basic Sciences, Cheju National University)
Koh Seok Chan (Department of Life Science & Research Institute for Basic Sciences, Cheju National University)
Publication Information
Korean Journal of Environmental Biology / v.23, no.2, 2005 , pp. 206-213 More about this Journal
Abstract
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.
Keywords
antioxidative enzymes; chlorophyll fluorescence partameters; Crinum asiaticum var. japonicum; O-J-I-P transients; winter stress;
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