Rapid Correlation between the Leaves of Spinach and the Photocontrol of a Peroxidase Activity

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Abstract
The activity of a basic peroxidase extracted at high pH from spinach (S. oleracea) leaves is modified by an irradiation with 2-min red light or 2-min far red light. This fast response, apparently mediated by phytochrome, is also detected in other leaves darkened with black paper. Apparently, some fast signal moves from irradiated to darkened leaves. This signal, but not the direct control of peroxidase activity in irradiated leaves, is suppressed by inhibitors known for their effect on Na+ or K+ distribution (ouabain, Li, tetrodotoxin or tetraethylammonium). Substances affecting Ca2+ distribution inhibit the signal transmission and the direct photocontrol of peroxidase activity.
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