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Published in Crop Sci 7:593-595 (1967)
© 1967 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Fatty Acid Composition of Corn (Zea mays L.) Oil as Influenced by Kernel Position on Ear1

M. D. Jellum2

Five oil samples from each of 3 kernel positions (base, middle, and tip of ear) of 5 ears each of 12 inbred lines were analyzed by gas-liquid chromatography to determine the effect of kernel position on oil composition. Kernel position had little effect on stearic and linolenic acids. In general, the proportion of palmitic and linoleic acids increased and the proportion of oleic acid decreased in the oil from kernels sampled linearly from the base to the tip of the ear. Kernel position exhibited more consistent and greater influence on oleic and linoleic acids than on palmitic acid. Mp428 and R196 showed no effect of kernel position on oil composition, whereas T202 and Tx39-16 showed marked effects of kernel position on oil composition. Since random sampling of kernels of certain inbreds can produce considerable variation in o11 composition due to the effect of kernel position, it was concluded that in studies in which single kernels are analyzed, sampling should be restricted to the middle portion of the ear. Correlation coefficients showed that the analyses of small oil samples (single kernels) were comparable to large oil samples (oil from six kernels).

Key Words: Corn • fatty acids of corn oil • gas-liquid chromatography • kernel position effects • corn oil

1 Journal Series Paper No. 51, University of Georgia College of Agriculture Experiment Stations, Georgia Station, Experiment, Ga. Assistance in the statistical analysis of the data was given by Glenn O. Ware, Computer Center, University of Georgia, Athens. The attthor acknowledges the cooperation of the Chemistry Departlnent and the assistance in this study by Howard Sims, Research Technician, Gus and Meredith Bohler (college students), and Ken Walker (high school student). This research was supported in part by Corn Products Colnpany.

2 Associate Agronomist, Georgia Experiment Station.

Received for publication March 31, 1967.




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