Abstract
The development of high-oleate soybean germplasm is hindered by the lack of knowledge of the genetic factors controlling oleate phenotypic variation. In the present study, several candidate genes implicated in oleate biosynthesis were mapped and their cosegregation with oleate, linoleate and linolenate quantitative trait loci (QTLs) was investigated. FAD2-2C, a previously described ω-6 desaturase isoform, was localized on linkage group E; whereas, a novel FAD2-2 isoform, designated as FAD2-2D, mapped on linkage group N. In addition, two isoforms were identified for the aminoalcoholphosphotransferase-encoding GmAAPT1 gene, denoted AAPT1a and AAPT1b. A database query suggested that only one functional copy of the FAD6 gene, encoding a plastid localized ω-6 desaturase, exists in the soybean genome. AAPT1a and FAD6 mapped on linkage group D1b, 23.40 cM apart. Linolenate QTLs with minor effects were identified near the FAD6 and AAPT1a markers in two segregating populations.
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Acknowledgments
The authors would like to thank William Novitzky at the USDA Soybean and Nitrogen Fixation Laboratory, Raleigh, NC, USA for providing training and equipment for the fatty acid analysis, as well as Carol Griffin for her technical expertise. This project was funded by the USDA Cooperative State Research, Education and Extension Service National Research Initiative, Plant Genome Program (award number 2003-35300-13190), and by the United Soybean Board.
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11032_2008_9246_MOESM1_ESM.pdf
Suppl. Fig. 1 Alignments of the upstream, coding and downstream regions of FAD2-2B and FAD2-2D isoforms, as well as FAD2-2C and FAD2-2D isoforms. Start and stop codons for translation of the reading frames are highlighted. The alignments extend till the end of the nucleotide similarity in the upstream and downstream regions, with the exception of the FAD2-2C and FAD2-2D alignment, where part of the upstream and coding region were included in order to show the predicted start codon (PDF 30 kb)
11032_2008_9246_MOESM2_ESM.pdf
Suppl. Fig. 2 Peptide, coding and full DNA sequences of the AAPT1a and AAPT1b genes. Exons are underlined and highlighted in the genomic DNA sequences. The primers used for amplification of the AT repeat in AAPT1b are written in bold italics (PDF 42 kb)
11032_2008_9246_MOESM3_ESM.pdf
Suppl. Fig. 3 Alignment of the putative peptides of the CPT1 gene of yeast and the AAPT1a and AAPT1b isoforms of soybean. The conserved amino acids, according to Dewey et al. (1994), are highlighted (PDF 14 kb)
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Bachlava, E., Dewey, R.E., Burton, J.W. et al. Mapping candidate genes for oleate biosynthesis and their association with unsaturated fatty acid seed content in soybean. Mol Breeding 23, 337–347 (2009). https://doi.org/10.1007/s11032-008-9246-7
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DOI: https://doi.org/10.1007/s11032-008-9246-7