Genetic mapping and validation of the loci controlling 7S α′ and 11S A-type storage protein subunits in soybean [Glycine max (L.) Merr.]
Boehm, J.D., Nguyen, V., Tashiro, R.M., Anderson, D., Shi, C., Wu, X., Woodrow, L., Yu, K., Cui, Y., Li, Z. (2018). Genetic mapping and validation of the loci controlling 7S α′ and 11S A-type storage protein subunits in soybean [Glycine max (L.) Merr.]. Theoretical and Applied Genetics (TAG), [online] 131(3), 659-671. http://dx.doi.org/10.1007/s00122-017-3027-9
Plain language summary
By manipulating certain storage protein subunits in soybean seeds, one is able to enhance soymeal nutrition and desirable tofu manufacturing characteristics, which are two important end-use quality goals in soybean breeding programs.
Two soybean storage proteins, namely β-conglycinin (7S subunit) and glycinin (11S subunits), can affect the quantity and quality of proteins found in soybean seeds and account for more than 70% of the total soybean protein.
To aid in the development of soybean cultivars with desired seed storage protein composition, multiple crosses were made between a soybean mutant with a high-protein cultivar, followed by propagation of several generations of the selected soybean plants to obtain the desired soybean line.
Locations of 4 soybean storage proteins subunits, 11S A1, 7S α' and 11S A4, and 11S A3 have been mapped to chromosomes 3, 10 and 13, respectively. These 4 loci are also referred to as Quantitative Trait Loci (QTLs) whose proteins produce a set of observable (quantitative) characteristics. Genomic regions controlling the 7S α' and 11S protein subunits were identified. The results of this research could allow for the much faster selection of desired seed storage protein subunits by screening the breeding populations.
Key message: Four soybean storage protein subunit QTLs were mapped using bulked segregant analysis and an F2 population, which were validated with an F5 RIL population. Abstract: The storage protein globulins β-conglycinin (7S subunit) and glycinin (11S subunits) can affect the quantity and quality of proteins found in soybean seeds and account for more than 70% of the total soybean protein. Manipulating the storage protein subunits to enhance soymeal nutrition and for desirable tofu manufacturing characteristics are two end-use quality goals in soybean breeding programs. To aid in developing soybean cultivars with desired seed composition, an F2 mapping population (n = 448) and an F5 RIL population (n = 180) were developed by crossing high protein cultivar ‘Harovinton’ with the breeding line SQ97-0263_3-1a, which lacks the 7S α′, 11S A1, 11S A2, 11S A3 and 11S A4 subunits. The storage protein composition of each individual in the F2 and F5 populations were profiled using SDS-PAGE. Based on the presence/absence of the subunits, genomic DNA bulks were formed among the F2 plants to identify genomic regions controlling the 7S α′ and 11S protein subunits. By utilizing polymorphic SNPs between the bulks characterized with Illumina SoySNP50K iSelect BeadChips at targeted genomic regions, KASP assays were designed and used to map QTLs causing the loss of the subunits. Soybean storage protein QTLs were identified on Chromosome 3 (11S A1), Chromosome 10 (7S α′ and 11S A4), and Chromosome 13 (11S A3), which were also validated in the F5 RIL population. The results of this research could allow for the deployment of marker-assisted selection for desired storage protein subunits by screening breeding populations using the SNPs linked with the subunits of interest.