IDENTIFICATION OF A FACTOR IN MAIZE THAT INCREASES EMBRYO FATTY ACID UNSATURATION BY TRISOMIC AND B-A TRANSLOCATIONAL ANALYSES

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Abstract
Trisomics and B-A translocations were utilized in Z. mays L. to detect a genetic factor(s) in the long arm of chromosome 5 expressing dosage effects which increases the fatty acid unsaturation level in embryos. In all lines analyzed, trisomic-5 embryos had significantly less oleic acid and significantly more linoleic acid than diploid sibling embryos. Oleic and linoleic acid levels were unaltered by trisomy of chromosomes 3, 4, or 6; thus, trisomy per se does not cause these changes. B-A translocations involving the long arm and the short arm of chromosome 5 were used to further locate this factor(s). Altering the number of copies of the short arm of chromosome 5 had no detectable effect on the fatty acids measured; altering the number of copies of the long arm of chromosome 5 produced the same alterations as trisomy of chromosome 5. Thus, this factor(s) is in the long arm of chromosome 5.

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