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Changes in the dry weight (dry wt.), total and neutral lipids, and fatty acid composition were determined in the cotyledons and axis of Citrullus lanatus cv. Sugar baby seedlings during their first 12 d growth in the dark, at 25 ± 1 °C. The major stored reserves were mobilized between days 3 and 8. The lipid concentration after day 4 decreased rapidly in the cotyledons. On the first day the lipid concentration in the axis was higher than in the cotyledons but decreased rapidly and from day 5 up to the end of the experiments it remained at very low values. In the cotyledons, the change in the fatty acid composition was relatively small compared to the significant change observed in the axis. The neutral lipids of the cotyledons decreased sharply between days 2 and 6 while their fatty acid composition suffered no significant change. The axis, compared to the cotyledons, contained a small but concentrated amount of neutral lipids, which decreased up to day 6. Thereafter, an increase was observed. The fatty acid composition of the axis neutral lipids changed significantly, linoleic and oleic acid decreased while palmitic and linolenic acid increased.
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Meletiou-Christou et al. (1990) studied this question.
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