Suppression of lipid peroxidation by β-carotene in illuminated chloroplast fragments : Evidence for β-carotene as a quencher of singlet molecular oxygen in chloroplasts
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1565The effect of β-carotene on light-induced lipid peroxidation was examined in heptane-extracted chloroplasts. Lipid peroxidation was suppressed by 50% when the extracted chloroplasts were reconstituted with β-carotene. However, β-carotene added to unextracted chloroplasts did not affect the lipid peroxidation. As the molal ratio of β-carotene to chlorophyll during the reconstitution increased, the rate of the lipid peroxidation decreased but became independent of the molal ratio above the value of 0.3. The results led to the conclusion that β-carotene in thylakoid membranes functions as an efficient quencher of singlet molecular oxygen which induces the lipid peroxidation.
- 日本植物生理学会の論文
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