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  1. Vol. 31 No. 6, p. 1522-1524
     
    Received: Feb 11, 1991
    Published: Nov, 1991


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doi:10.2135/cropsci1991.0011183X003100060027x

Inheritance of Elevated Palmitic Acid Content in Soybean Seed Oil

  1. W. R. Fehr ,
  2. G. A. Welke,
  3. E. G. Hammond,
  4. D. N. Duvick and
  5. S. R. Cianzio
  1. Dep. of Agronomy, Iowa State Univ., Ames IA 50011
    Dep. of Food Technology, Iowa State Univ., Ames, 1A 50011

Abstract

Abstract

Soybean [Glycine max (L.) Merr.] oil with an elevated palmitic acid content may be useful for production of some food and industrial products. Two mutant soybean lines with palmitic acid contents of > 180 g kg-1 were developed by treatment of ‘A1937’ seeds with N-nitroso-N-methylurea (NMU) and ‘Elgin’ seeds with ethyl methanesuifonate (EMS). The mutant lines, A1937NMU-85 and EiginEMS-421, were crossed to determine their genetic relationship for elevated paimitic acid content. The F2 and F3 generations were grown in the field and transgressive segregates with >250 g kg-1 palmitic acid were obtained, the highest content known in soybean. The segregation ratios indicate that the two mutant lines have different alleles at two independent loci. A1937NMU-85 was crossed to C1727, a line with the fap2 allele that controls increased palmitic acid content. The lack of transgressive segregation in the F2 generation of the cross indicate that AI937NMU-85 and C1727 have alleles controlling high palmitic acid at the same locus or at tightly linked loci. The allele in AI937NMU-85 was designated fap2-b. The allele in ElginEMS-421 was given the temporary designation of fap?(ElginEMS-421) until its relationship to other alleles for modified palmitic acid content can be determined.

Journal Paper no. J-14392 of the Iowa Agric. and Home Econ. Exp. Stn., Ames, IA; Projects no. 2475 and 2799. The research was supported in part by a grant from the Iowa Soybean Promotion Board.

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