Soybean Genes Associated With Low Palmitic and Low Linolenic Acid

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.

Autorentext

Ana was born in Cali, Colombia. She has a B.Sc. in Biology from the "Universidad del Valle" located in Cali. In2003 she started graduated studies at the University of PuertoRico. Then in 2004 she transferred to NCSU, to the Crop ScienceDepartment, where she got her Master of Science degree in 2006.

Klappentext

It is important to study target genes that control denovo fatty acid biosynthesis and triacylglycerol insoybean (Glycine max L. Merr.). At least 5 recessivealleles condition the low palmitic acid (16:0)contents of soybean seeds: fap1, fap3, fap*, fapncand sop1. The fapnc mutation affects the normalfunction of the enzyme 16:0-ACP thioesterase encodedby the gene FATB1. There are four FATB1 isoforms insoybean: GmFATB1a, GmFATB1b, GmFATB2a, and GmFATB2b. At least three major loci are responsible for lowlinolenic acid (18:3) content in soybean seed oil(fan, fan2 and fan3). The FAD3 gene encodes anomega-3 desaturase that converts 18:2 to 18:3. It hasfour highly similar microsomal isoforms: GmFAD3A andGmFAD3B, FAD3-2a and FAD3-2b.The root and leaf tissue fatty acid composition oftwo lines carrying the fapnc, fap1, the fan(PI123440)(a SNP in intron 2 of GmFAD3A) alleles and Brim ahigh yielding line, was examined. It was concludedthat fapnc or fap1 or both mutations have pleiotropiceffects on the leaf fatty acid composition. The fanmutation has a pleiotropic effects on the leaf androot fatty acid composition but has not beennegatively correlated with yield.