Successive segments of mung bean hypocotyls (Vigna radiata) show fatty acid changes according to the lengths of their cells. Only the accumulation of oleic acid was related to the growth process; its level was markedly increased all along the hypocotyl. When segments were treated with IAA in vitro, all that had increments in length also had increased oleic acid contents. These two factors were highly correlated. Phosphatidylcholine, and to a less extent phosphatidylethanolamine, were the two phospholipids involved in this phenomenon. Fusicoccin increased cell length but made little, if any, change in the fatty acid content. These results have been interpreted in terms of membrane synthesis and transfer of the membrane from the endoplasmic reticulum toward the plasmalemma and tonoplast.
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Goldberg et al. (1983) studied this question.