Abstract
Auxin has been reported to substantially alter concentration and fatty acid composition of phospholipids in elongating pea ( Pisum sativum L. cv. Feltham First) stem segments. To further investigate this phenomenon, phospholipid composition of cv. Alaska pea segments treated with the auxin 2,4-dichlorophenoxyacetic acid (2,4-D) for 30 or 60 min was analyzed. The amount of phosphatidylethanolamine (PE) was lower in 2,4-D-treated segments at 30 min, but by 60 min, the amount was comparable to controls. Quantitative differences in phosphatidylcholine (PC) and phosphatidylinositol (PI) were not significant. Auxin did not affect phospholipid fatty acid composition. Auxin did not inhibited the incorporation of [ 14C]acetate or [ 3H]choline into the major phospholipids. These results suggest that effects of auxin on phospholipid metabolism are transient, and that shifts in fatty acid composition do not universally occur in response to auxin treatment.
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