Abstract
The loss of genetic diversity in bread wheat ( Triticum aestivum L.) due to bottlenecks from polyploidy, domestication, and modern plant breeding can be compensated by introgressing exotic germplasm. A successful approach to capture genetic diversity is the production of primary synthetic bread wheats, which are contemporary reconstitutions of the ancestral genomes of wheat from diverse wild relatives. However, this diverse germplasm has many undesirable characters, making direct use in breeding programs difficult. To increase the speed of introgression of exotic germplasm, genomic selection approaches could be applied to enable rapid cycles of selection. To test this, selected lines from double haploid and recombinant inbred line populations between six different primary synthetics and the elite cultivar ‘Opata M85’ were evaluated for grain yield and other important agronomic traits. Field trials were conducted at CIMMYT (International Center for Maize and Wheat Improvement) over 2 yr in irrigated, heat, and drought‐stressed environments. Several synthetic‐derived lines outperformed the elite parent Opata M85 in all environments, indicating that the primary synthetics contribute alleles increasing yield. Whole‐genome profiles were generated using genotyping‐by‐sequencing. Five different whole‐genome prediction models that can be applied for genomic selection were evaluated for prediction accuracy using cross validation. Overall, the prediction models had moderate predictive ability, slightly lower than expected based on the heritability of the traits. While a viable approach, rapid cycle genomic selection for introgression of exotic alleles might be restricted with synthetic‐derived wheat due to complex and confounding physiological effects.
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Claims 4
Claim · model-written summary
Several synthetic-derived wheat lines exceeded Opata M85 for grain yield in all environments.
- Taxon
- wheat
Triticum aestivumt0 - Material
- synthetic‐derived linese0
- Outcome
- yielde0
- Direction
- outperformede0
- Qualifier
- in all environmentse0
- Comparator
- Opata M85e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Several synthetic‐derived lines outperformed the elite parent Opata M85 in all environments, indicating that the primary synthetics contribute alleles increasing yield.”
t0“Wheat”
Claim · model-written summary
The primary synthetics apparently contributed yield-increasing alleles.
- Taxon
- wheatTriticum aestivumt0
- Material
- primary syntheticse0
- Outcome
- yielde0
- Qualifier
- alleles increasing yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“indicating that the primary synthetics contribute alleles increasing yield.”
t0“Wheat”
Claim · model-written summary
Whole-genome prediction models had moderate predictive ability.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- predictive abilitye0
- Direction
- slightly lowere0
- Comparator
- expected based on the heritability of the traitse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Overall, the prediction models had moderate predictive ability, slightly lower than expected based on the heritability of the traits.”
t0“Wheat”
Claim · model-written summary
Rapid cycle genomic selection for synthetic-derived wheat may be limited by complex physiological effects.
Verbatim
e0“rapid cycle genomic selection for introgression of exotic alleles might be restricted with synthetic‐derived wheat due to complex and confounding physiological effects.”