Genome-wide association study reveals novel genomic regions for grain yield and yield-related traits in drought-stressed synthetic hexaploid wheat
Synthetic hexaploid wheat (SHW; 2n = 6x = 42, AABBDD, Triticum aestivum L.) is produced from an interspecific cross between durum wheat (2n = 4x = 28, AABB, T. turgidum L.) and goat grass (2n = 2x = 14, DD, Aegilops tauschii Coss.) and is reported to have significant novel alleles-controlling biotic and abiotic stresses resistance. A genome-wide association study (GWAS) was conducted to unravel these loci [marker?trait associations (MTAs)] using 35,648 genotyping-by-sequencing-derived single nucleotide polymorphisms in 123 SHWs. We identified 90 novel MTAs (45, 11, and 34 on the A, B, and D genomes, respectively) and haplotype blocks associated with grain yield and yield-related traits including root traits under drought stress. The phenotypic variance explained by the MTAs ranged from 1.1% to 32.3%. Most of the MTAs (120 out of 194) identified were found in genes, and of these 45 MTAs were in genes annotated as having a potential role in drought stress. This result provides further evidence for the reliability of MTAs identified. The large number of MTAs (53) identified especially on the D-genome demonstrate the potential of SHWs for elucidating the genetic architecture of complex traits and provide an opportunity for further improvement of wheat under rapidly changing climatic conditions.
| Main Authors: | , , , |
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| Format: | Article biblioteca |
| Language: | English |
| Published: |
MDPI
2018
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| Subjects: | AGRICULTURAL SCIENCES AND BIOTECHNOLOGY, Marker Trait Association, Haplotype Blocks, Root Traits, D-Genome, Genotyping by Sequencing, Single Nucleotide Polymorphism, Complex Traits, Durum Wheat, Bread Wheat, SOFT WHEAT, HARD WHEAT, NUCLEOTIDE SEQUENCE, GENOTYPES, GENES, GENETIC MARKERS, |
| Online Access: | https://hdl.handle.net/10883/19653 |
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