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a Dep. of Agronomy, Iowa State Univ., Ames, IA 50011 USA
wfehr{at}iastate.edu
An oil from soybean [Glycine max (L.) Merr.] cultivars with <20 g kg-1 linolenate would have a desirable oxidative stability. The objective of our study was to compare the agronomic and seed traits of lines with the genotype fan1(A5)fan1(A5)fan2(A23)fan2(A23)fan3fan3, designated as 1%-linolenate (<20 g kg -1) lines, and the genotype fan1(A5)fan1(A5)fan2(A23)fan2(A23), designated as 2%-linolenate lines (>20 g kg-1). Three backcross populations were developed by crossing three high-yielding, recurrent parents with 
25 g kg-1 linolenate to a donor line with 13 g kg-1 linolenate. For each population, 27 1%- and 27 2%-linolenate BC1F2:4 lines were evaluated at Ames, Grand Junction, and Hubbard, IA during 1998. The mean seed yields of the 1%-linolenate lines were 47 kg ha-1 lower in Population 1, 65 kg ha-1 lower in Population 2, and 164 kg ha-1 lower in Population 3 than the 2%-linolenate lines, but the difference was only significant in Population 3. The maximum mean differences between the 1%- and 2%-linolenate lines in any of the populations for the remaining agronomic and seed traits were 1 d for maturity, 0.1 score for lodging, 2 cm for plant height, 4 mg seed-1 for seed weight, 5 g kg-1 each for protein and oil content, 0.6 g kg-1 for palmitate, 2.2 g kg-1 for stearate, 16.4 g kg-1 for oleate, and 6.8 g kg-1 for linoleate. The lack of major differences between the 1%- and 2%-linolenate lines indicated that it should be possible to develop acceptable cultivars with <20 g kg-1 linolenate.
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