Soybean - Bioenergy Crop Plants - page 510

taBle 20.2 (continued)
qtl locations, markers, significance, and Parental source associated with Palmitic
(16:0), stearic (18:0), oleic (18:1), linoleic (18:2), and linolenic (18:3) Fatty acids in
soybean oil
Fatty
acid

map
Position

r 2
(%) lG marker Parent 1 Parent 2 references

18:1 L 71.4 Satt561 .25 G99-G725 N00-3350 Monteros et al. (2008)

18:2 A1 92.3 A104_1 33 A81-365022 PI468916 Diers and Shoemaker (1992)

18:2 A1 92.6 A170_1 30 A81-365022 PI468916 Diers and Shoemaker (1992)

18:2 A1 102.3 A082_1 38 A81-365022 PI468916 Diers and Shoemaker (1992)

18:2 B1 58.9 A118_1 20 A81-365022 PI468916 Diers and Shoemaker (1992)

18:2 B2 - Fad3i6 70-75 RG10 OX948 Reinprecht et al. (2006)

18:2 E 11.0 A242_2 21 A81-365022 PI468916 Diers and Shoemaker (1992)

18:2 E 13.6 Pb 20 A81-365022 PI468916 Diers and Shoemaker (1992)

18:2 E 44.8 Satt185 13 N87-984-16 TN93-99 Panthee et al. (2006)

18:2 F 93.7 - 10 Essex Williams Hyten et al. (2004)

18:2 L 74.5 - 50 Essex Williams Hyten et al. (2004)

18:3 B2 - pB194-1 pB124 85 C1640 PI479750 Brummer et al. (1995)

18:3 B2 87.5 Satt534 Fad3i6 72-78 RG10 OX948 Reinprecht et al. (2006)

18:3 E 6.3 SAC7_1 31 A81-365022 PI468916 Diers and Shoemaker (1992)

18:3 E 11.0 A242_2 23 A81-365022 PI468916 Diers and Shoemaker (1992)

18:3 E 28.3 K229_1 20 A81-365022 PI468916 Diers and Shoemaker (1992)

18:3 E 30.9 A454_1 22 A81-365022 PI468916 Diers and Shoemaker (1992)

18:3 E 34.6 A203_1 22 A81-365022 PI468916 Diers and Shoemaker (1992)

18:3 E 45.4 Satt263 12 N87-984-16 TN93-99 Panthee et al. (2006)

18:3 G 21.9 Satt235 22 N87-984-16 TN93-99 Panthee et al. (2006)

18:3 K - A065_3 20 A81-365022 PI468916 Diers and Shoemaker (1992)

18:3 L 36.7 A023_1 26 A81-365022 PI468916 Diers and Shoemaker (1992)

18:3 L 50.6 - 13 Essex Williams Hyten et al. (2004)

18:3 L 82.5 - 24 Essex Williams Hyten et al. (2004)

Note: The linkage group (LG) and map position (cM) designation of marker is based on the integrated soybean genetic
linkage map, Gmcomposite2003, reported in SOYBASE (http://soybase.org).

Reduced palmitic acid soybean lines have been developed by chemical mutagenesis, recurrent
selection, and hybridization (Erickson et al. 1988; Bubeck et al. 1989; Wilcox and Cavins 1990;
Burton et al. 1994). At least three recessive genes at the Fap locus are responsible for palmitic acid
content in soybean oil (Pantalone et al. 2004; Wilson 2004). Soybean N79-2077-12, with approxi-
mately 6% palmitic acid, has a recessive fap nc allele and was developed from recurrent selection
(Burton et al. 1994). Low palmitic acid germplasm lines C1726 and A22 were derived from muta-
genesis of Century and A1937, respectively. C1726, with approximately 8% palmitic acid, has the
recessive fap1 allele (Bubeck et al. 1989; Wilcox and Cavins 1990). A22, with 6.8% palmitic acid,
has the recessive fap3 allele (Fehr et al. 1991a). Palmitic acid content of F 2 progeny from a cross
between A22 × C1726 with the homozygous genotype fap1 fap1, fap3 fap3, and line A18 (Fehr
et al. 1991a) had 4.0% 16:0 compared with 7.1 and 8.0%, respectively, for A22 and C1726.
Four recessive alleles have been identified that increased palmitic acid levels. Mutant C1727
( fap2 allele with 17%), A21 ( fap2b allele with 20%), and A24 ( fap4 with 18%) were developed by