Genetic relationship among several fatty acid mutants of soybean
Abstract
Soybean oil is composed of five fatty acids: palmitic (16:0), stearic (18:0), oleic (18:1), linoleic (18:2), and linolenic (18:3). Several mutant lines have been isolated from an ethyl-methylsulfonate treated population of soybean (Glycine max). These lines have aberrant levels of each of the five fatty acids. The genetic control of aberrant fatty acid levels in some mutants is unknown. A crossing program was set up to accomplish two objectives. The first was to determine the genetic control of the unknown fatty acid mutants. The second objective was to determine relationships among alleles controlling levels of specific fatty acids. Fatty acid composition of F$\sb2$ seeds from crosses of C1640, (low 18:3) with both C1726 (low 16:0) and C1727 (high 16:0) were determined by gas chromatography. Chi-square analyses of the data demonstrated that the fan locus controlling low 18:3 was inherited independently from both the fap1 and fap2 loci controlling low and high levels of 16:0, respectively. There was no indication of an interaction among alleles at these loci. The decreases in palmitic acid due to fap1 and increases due to fap2 were associated primarily with changes in oleic and linoleic acids. Decreases in linolenic acid due to fan were associated primarily with increases in linoleic acid. Results from crosses of 10689-4 (low 18:3) with C1640 and CX1022-90 (low 18:3) may indicate a new allele for low linolenic acid.
Degree
Ph.D.
Advisors
Wilcox, Purdue University.
Subject Area
Agronomy
Off-Campus Purdue Users:
To access this dissertation, please log in to our
proxy server.