Abstract
There has not been a major wheat stem rust epidemic in Canada since 1954. The detection of race TTKSK, with virulence to Sr31 and most other stem rust resistance genes in wheat, presents a threat to the wheat crop worldwide. Single disease resistance genes are usually effective for only several years before the pathogen changes genetically to overcome the resistance. To produce more durable resistance to race TTKSK, as well as to leaf rust and Fusarium head blight (FHB), we produced pyramided lines with several resistance genes. A population of 68 doubled haploids was produced from the hybrid ‘AC Cadillac’ (SrCad, Lr34)/‘Carberry’ (Lr34, Fhb1) × ‘RL5405' (Sr33)/‘Carberry’ (Lr34, Fhb1). A total of 16 combinations of variable numbers of the four genes were recovered by marker assisted selection. The most notable combination with four of the genes was Sr33, SrCad, Lr34 and Fhb1. Two such lines were recovered. All pyramided lines with Lr34 and SrCad or Sr33 were resistant to race TTKSK, while two control wheat varieties 'Shaw’ and ‘Little Club’ were susceptible. The two pyramided lines (SrCad-Sr33-Lr34-Fhb1) were relatively more resistant than the lines containing only one gene for stem rust resistance. The pyramided lines with Lr34 showed good resistance to leaf rust races 12–3 MBDS and TDBG. The pyramids with Fhb1 did not show a lowered expression of Fusarium head blight.
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Claims 6
Claim · model-written summary
Marker-assisted selection recovered 16 combinations of four resistance genes in wheat doubled haploids.
- Taxon
- wheat
Triticum aestivumt0 - Outcome
- combinations of variable numbers of the four genese0
- Value
- 16 combinationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A total of 16 combinations of variable numbers of the four genes were recovered by marker assisted selection.”
e1“A population of 68 doubled haploids was produced from the hybrid”
t0“in wheat”
Claim · model-written summary
Two wheat lines carrying Sr33, SrCad, Lr34 and Fhb1 were recovered.
- Taxon
- wheatTriticum aestivumt0
- Gene
- Sr33, SrCad, Lr34 and Fhb1e0
- Outcome
- lines were recoverede0
- Value
- Twoe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The most notable combination with four of the genes was Sr33, SrCad, Lr34 and Fhb1. Two such lines were recovered.”
t0“in wheat”
Claim · model-written summary
All pyramided wheat lines with Lr34 and SrCad or Sr33 resisted race TTKSK, whereas Shaw and Little Club were susceptible.
- Taxon
- wheatTriticum aestivume0
- Material
- pyramided linese0
- Interactor
- race TTKSKe0pathogen
- Gene
- Lr34 and SrCad or Sr33e0
- Outcome
- resistant to race TTKSKe0
- Comparator
- 'Shaw’ and ‘Little Club’e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All pyramided lines with Lr34 and SrCad or Sr33 were resistant to race TTKSK, while two control wheat varieties 'Shaw’ and ‘Little Club’ were susceptible.”
Claim · model-written summary
The two four-gene pyramided lines were relatively more resistant to stem rust than lines with one stem rust resistance gene.
- Taxon
- wheatTriticum aestivumt0
- Material
- pyramided linese0
- Gene
- SrCad-Sr33-Lr34-Fhb1e0
- Outcome
- stem rust resistancee0
- Direction
- more resistante0
- Comparator
- lines containing only one gene for stem rust resistancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The two pyramided lines (SrCad-Sr33-Lr34-Fhb1) were relatively more resistant than the lines containing only one gene for stem rust resistance.”
t0“in wheat”
Claim · model-written summary
Pyramided wheat lines with Lr34 showed good resistance to leaf rust races 12–3 MBDS and TDBG.
- Taxon
- wheatTriticum aestivumt0
- Material
- pyramided linese0
- Interactor
- leaf rust races 12–3 MBDS and TDBGe0pathogen
- Gene
- Lr34e0
- Outcome
- good resistance to leaf rust races 12–3 MBDS and TDBGe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The pyramided lines with Lr34 showed good resistance to leaf rust races 12–3 MBDS and TDBG.”
t0“in wheat”
Claim · model-written summary
Pyramids with Fhb1 did not show reduced Fusarium head blight expression.
- Taxon
- wheatTriticum aestivumt0
- Gene
- Fhb1e0
- Outcome
- expression of Fusarium head blighte0
- Direction
- did not show a lowerede0
FusariumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The pyramids with Fhb1 did not show a lowered expression of Fusarium head blight.”
t0“in wheat”