Association analysis is an alternative to conventional, family-based methods for detecting the location of gene(s) or quantitative trait loci (QTLs), and provides relatively high resolution in terms of defining the genome position of a gene or QTL. Flavour is an essential quality characteristic of soymilk; however, soymilk contains volatile compounds unacceptable to consumers. One of main constituents in the volatiles of normal soymilk is 2-heptenal, which is thought to be a degradative oxidation product of polyunsaturated acids. In this study, a genome-wide association study using 24 651 single-nucleotide polymorphisms (SNPs) was performed to identify quantitative trait nucleotides (QTNs) controlling 2-heptenal content in soybean (Glycine max (L.) Merr.) seed from a natural population of 110 soybean germplasm accessions. We detected 62 significant QTNs located on 18 different chromosomes that are significantly associated with 2-heptenal content in soybean seed. Among these, 17 QTNs co-localised with QTLs previously found to be related to protein, oil and/or fatty acid content in soybean seed. We also identified some candidate genes involved in lipid metabolism. These findings further our understanding of the genetic basis of 2-heptenal content in soybean seed and the improvement of marker-assisted breeding efficiency, which will be important for breeding soybean cultivars with low 2-heptenal content.
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29 October 2020
Genetic dissection of 2-heptenal content in soybean (Glycine max) seed through genome-wide association study
Zhikun Wang,
Mingming Yang,
Yuanzhuo Wang,
Chao Yang,
Xue Zhao,
Lizheng Tian,
Yupeng Shao,
Gege Bao,
Jinxiu Huang,
Ning Xia,
Yingpeng Han
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Crop and Pasture Science
Vol. 71 • No. 10
November 2020
Vol. 71 • No. 10
November 2020
2-heptenal concentration
candidate genes
GWAS
quantitative trait nucleotides
SNP
soybean