Membrane Lipids and Phosphatidyl Choline Turnover in Embryos from Germinating Low and High Vigour Wheat (Triticum aestivum)

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Abstract
Free sterols, glycolipids and phospholipids were studied in the embryos of wheat during germination. Two cultivars as well as low and high vigour seed lots were investigated. In all of the lots the levels of the membrane lipids increased slowly up to 24–36 h of germination. After this time the levels increased rapidly up to 72 h when the experiment was terminated. Between 24 h and 72 h high vigour embryos accumulated membrane lipids more rapidly than did low vigour embryos. The patterns of lipid accumulation were, however, similar in the two lots and the difference between them was apparently due merely to low vigour embryos entering the rapid accumulation phase later than the high vigour embryos. It is suggested that this difference arises due to low vigour embryos entering the first phase of mitosis later than the high vigour embryos. Further fractionation of the three classes of membrane lipids did not reveal any other differences that could be correlated with the vigour of the seed lots. Incorporation of [Me-14C]choline into phosphatidyl choline was slower and the turnover of [14C]choline-labelled phosphatidyl choline was faster in low vigour than in high vigour embryos.

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