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Viewing report
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Soybean Genes Associated With Low Palmitic and Low
Linolenic Acid. Edition No. 1
VDM Publishing House, March 2009, Pages: 68
It is important to study target genes that control de
novo fatty acid biosynthesis and triacylglycerol in
soybean (Glycine max L. Merr.). At least 5 recessive
alleles condition the low palmitic acid (16:0)
contents of soybean seeds: fap1, fap3, fap-, fapnc
and sop1. The fapnc mutation affects the normal
function of the enzyme 16:0-ACP thioesterase encoded
by the gene FATB1. There are four FATB1 isoforms in
soybean: GmFATB1a, GmFATB1b, GmFATB2a, and GmFATB2b.
At least three major loci are responsible for low
linolenic acid (18:3) content in soybean seed oil
(fan, fan2 and fan3). The FAD3 gene encodes an
omega-3 desaturase that converts 18:2 to 18:3. It has
four highly similar microsomal isoforms: GmFAD3A and
GmFAD3B, FAD3-2a and FAD3-2b.
The root and leaf tissue fatty acid composition of
two lines carrying the fapnc, fap1, the fan(PI123440)
(a SNP in intron 2 of GmFAD3A) alleles and Brim a
high yielding line, was examined. It was concluded
that fapnc or fap1 or both mutations have pleiotropic
effects on the leaf fatty acid composition. The fan
mutation has a pleiotropic effects on the leaf and
root fatty acid composition but has not been
negatively correlated with yield.
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