Abstract
Summary Chlorophyll photobleaching (photooxidation) was enhanced at the early stages of greening of etiolated cucumber cotyledons.Chlorophyll breakdown diminished from approx.20% to approx.3% during the initial 10 hours of chloroplast development.Heat-pretreatment (60°C for 15 min) caused marked enhancement in chlorophyll photo bleaching at all stages investigated.This process was not affected by several scavengers for active oxygen (superoxide dismutase, catalase, ascorbate, NADH, NADPH, β-carotene or α-tocopherol).The mode of chlorophyll photoresistance development and the action of heat-pretreatment on chlorophyll photo bleaching were discussed.
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