It is shown that δ 13 C values of total fatty acids in each of the main lipidic classes of tobacco leaves reach a uniform value around −34.3‰. This finding is in agreement with the common origin for acyl chains demonstrated in plant cells. For all the lipidic classes investigated, the δ 13 C values in acyl chains were lower than in the whole lipidic molecules, except for the phosphatidylcholine in which the acyl chains and the polar head had similar values. Metabolic origins of the different part of lipidic molecules are discussed and related to the localization of the isotope fractionation step.
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Deléens et al. (1984) studied this question.
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