Abstract
1. The incorporation of dl-[2-(14)C]mevalonic acid lactone into beta-carotene and the phytol side chain of chlorophyll has been investigated in cotyledons of four species of pine seedlings (Pinus silvestris, P. contorta, P. radiata and P. jeffrei) grown in darkness and in light. 2. The relative incorporation of label into beta-carotene and the phytol side chain of chlorophyll is similar to that observed in experiments on monocotyledons and dicotyledons. 3. The relative incorporation of (14)CO(2) into beta-carotene and phytol is much higher than the incorporation of [2-(14)C]mevalonic acid.
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