Changes in lipid and fatty acid composition of pine needle chloroplasts were determined upon transfer of the trees from outside (‐5°C) to 32°C. Within 7 1/2 hours after transfer, conversion of a portion of digalactosyldiglyceride into monogalactosyl diglyceride was observed. This portion consisted of a conjugate with extra long chain fatty acids (cerotic acid, 26: 0, and C26‐cyclo‐propane fatty acid). Only minor further changes in lipid and fatty acid composition were observed. Dehardening of the needles occurred within the same period. The data support the hypothesis that the degalactosidation reaction specifically depends on the fatty acid composition. The extra long chain fatty acids may link different sub‐units of the chloroplasts and may contribute to an additional layer of H‐bonded water on the membrane surface because of the increased exposure of the galactose groups.
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Bervaes et al. (1972) studied this question.
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