Decomposing Additive Genetic Variance Revealed Novel Insights into Trait Evolution in Synthetic Hexaploid Wheat

Frontiers in Genetics
Abdulqader JighlyFrancis C Ogbonnaya

Abstract

Whole genome duplication (WGD) is an evolutionary phenomenon, which causes significant changes to genomic structure and trait architecture. In recent years, a number of studies decomposed the additive genetic variance explained by different sets of variants. However, they investigated diploid populations only and none of the studies examined any polyploid organism. In this research, we extended the application of this approach to polyploids, to differentiate the additive variance explained by the three subgenomes and seven sets of homoeologous chromosomes in synthetic allohexaploid wheat (SHW) to gain a better understanding of trait evolution after WGD. Our SHW population was generated by crossing improved durum parents (Triticum turgidum;2n = 4x = 28, AABB subgenomes) with the progenitor speciesAegilops tauschii(synAe. squarrosa, T. tauschii; 2n = 2x = 14, DD subgenome). The population was phenotyped for 10 fungal/nematode resistance traits as well as two abiotic stresses. We showed that the wild D subgenome dominated the additive effect and this dominance affected the A more than the B subgenome. We provide evidence that this dominance was not inflated by population structure, relatedness among individuals or by longer linkag...Continue Reading

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Citations

Apr 27, 2018·Molecular Ecology Resources·Abdulqader JighlyHans D Daetwyler
Jul 30, 2019·The Plant Journal : for Cell and Molecular Biology·Abdulqader JighlyHans D Daetwyler
Dec 6, 2019·Frontiers in Plant Science·Abdulqader JighlyHans D Daetwyler
Jun 7, 2020·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Reem JoukhadarMatthew Hayden

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Methods Mentioned

BETA
chips
genotyping

Software Mentioned

R
PLINK
DArT
GREML

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