Effectiveness of intermittent light treatments on anthocyanin synthesis in dark-grown and light-pretreated seedlings.
Differences in the extent of anthocyanin production between intermittent light treatments with short and long dark intervals between successive irradiations are more pronounced in dark-grown than in light-pretreated cabbage seedlings. This observation is consistent with the hypothesis, based on destruction kinetics data, that there might be two pools of phytochrome, a labile one and a stable one, present in different proportions in dark-grown and light-pretreated seedlings, and suggests that light-dependent changes of the stable to labile phytochrome ratio might be physiologically significant in the photoregulation of photomorphogenic responses.
Mancinelli
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Department of Biological Sciences, Columbia University, New York, New York 10027.
Rabino
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