Developmental changes in fatty acid composition of oil in kernel fractions of corn (Zea mays L.) |
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Authors: | M D Jellum |
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Affiliation: | (1) Department of Agronomy, Georgia Agricultural Experiment Stations, Georgia Station, Experiment, 30212, Georgia |
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Abstract: | Gas liquid chromatography was used to determine the change in fatty acid composition of oil from three kernel fractions (pericarp,
endosperm and germ) during kernel maturation of four inbred lines of corn. Inbred lines were sibpollinated, and sampling of
ears began six days after pollination (DAP) and continued at three day intervals until 33 DAP and then at weekly intervals
until 54 DAP. Proportion of palmitic acid in the pericarp oil rapidly decreased between 6 and 12 DAP while oleic and linoleic
acids increased during the same period. Changes in fatty acid composition of oil from the endosperm during kernel maturation
were erratic and no consistent trends were evident. In the germ oil, palmitic and linolenic acid proportions decreased during
kernel maturation, while oleic acid decreased and linoleic acid increased during kernel maturation for three of the four inbred
lines. By about 24 to 27 DAP, the fatty acid composition of oil in the mature kernel was established. Since kernel fractions
are of different genetic origin, a study of developmental changes in lipid classes or in fatty acid composition of oil should
be limited within kernel fractions that have a similar genetic constitution.
Approved as Journal Series Paper No. 723, University of Georgia, College of Agriculture Experiment Stations. |
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