Unlocking the novel genetic diversity and population structure of synthetic Hexaploid wheat

• DOI: 10.1186/s12864-018-4969-2
• Publication Date: 2018-08-06T14:09:39Z
• Authors: Madhav Bhatta; Alexey Morgounov; Vikas Belamkar; Jesse Poland; P. Stephen Baenziger
• Keywords: Aegilops tauschii; Germ plasm

Synthetic hexaploid wheat (SHW) is a reconstitution of from its progenitors (Triticum turgidum ssp. durum L.; AABB x Aegilops tauschii Coss.; DD) and has novel sources genetic diversity for broadening the base elite bread (BW) germplasm (T. aestivum L). Understanding population structure SHWs will facilitate their use in breeding programs. Our objectives were to understand compare with BW cultivars demonstrate potential broaden modern germplasm. The genotyping-by-sequencing SHW provided 35,939 high-quality single nucleotide polymorphisms (SNPs) that distributed across A (33%), B (36%), D (31%) genomes. percentage SNPs on genome was nearly same as other two genomes, unlike where polymorphism generally much lower than This indicates presence high variation SHWs. gene 88.2% higher found sample cultivars. Population analysis revealed could be separated into subgroups, mainly differentiated by geographical location parents growth habit crop (spring winter type). Further Ae. separately identified based type used. Although divided sub-species: strangulate, they not clearly distinguished outcome. differentiation between (Spring_SHW Winter_SHW) samples using molecular variance indicated 17.43% populations remainder within populations. diverse had through GBS-derived SNPs. results this study provide valuable information improvement inclusion prerequisite association mapping genomic selection unravel economically important marker-trait associations cultivar development.