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Scots pine (Pinus sylvestrisL.) is generally resistant to chilling temperatures. Porphyrin metabolism under low temperature stress was studied in etiolated seedlings of Scots pine. Low temperatures affect porphyrin accumulation in at least 3 different temperature sensitive sites: 1) the light activated accumulation of 5‐aminolevulinic acid, a porphyrin precursor, 2) the metabolism of 5‐aminolevulinic acid to form porphyrins and 3) a preferential accumulation of chlorophyllaover chlorophyllb. The temperature sensitivity of pine is compared to maize (Zea maysL.), a chilling sensitive plant.
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Hodgins et al. (1989) studied this question.
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