Abstract
Abstract The RWA, Diuraphis noxia (Kurdjumov), is a devastating insect pest of wheat ( Triticum aestivum L.) and barley ( Hordeum vulgare ) in the United States and in many parts of the world. The use of D. noxia -resistant cultivars is an economically useful approach for protecting cereals from this aphid. However, there are few genes conferring resistance to the most predominant US biotype (Biotype RWA2). Wheat line CI2401, originating from Tajikistan, has been identified to be resistant to RWA2. An F 2 -derived F 3 (F 2:3 ) segregating population developed from a cross between CI2401 and Glupro (a high quality susceptible wheat cultivar) was used to genetically map the resistance in CI2401. Seedlings from F 2 individuals and F 3 families were infested with RWA2 aphids. Seedling reactions were scored as resistant or susceptible based on the degrees of leaf rolling and chlorosis. The observed segregation ratios in the F 2 and F 3 generations indicate the presence of a major dominant gene controlling resistance to RWA2. The gene, named Dn2401, was genetically mapped to the short arm of chromosome 7D. Xbarc214 mapped 1.1 cM and Xgwm473 mapped 1.8 cM distal and proximal, respectively, to the gene. Association studies using more than 12,000 SNPs and SilicoDArTs confirmed the presence of a major signal associated with resistance on chromosome 7DS. In addition, a minor signal was detected in chromosome 1D. The markers developed in this study will be useful for marker-assisted-breeding for resistance to RWA2.
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Claims 8
Claim · model-written summary
Wheat CI2401 showed resistance to RWA2.
- Taxon
- Wheat
Triticum aestivume0 - Material
- CI2401e0
- Interactor
- RWA2e0pest
- Outcome
- resistant to RWA2e0
- Setting
- Tajikistane0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Wheat line CI2401, originating from Tajikistan, has been identified to be resistant to RWA2”
Claim · model-written summary
Segregation in wheat indicated a major dominant gene controlling RWA2 resistance.
- Taxon
- wheatTriticum aestivume1
- Interactor
- RWA2e0pest
- Gene
- major dominant genee0
- Outcome
- resistance to RWA2e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The observed segregation ratios in the F 2 and F 3 generations indicate the presence of a major dominant gene controlling resistance to RWA2”
e1“wheat ( Triticum aestivum L.)”
Claim · model-written summary
Wheat resistance gene Dn2401 mapped to the short arm of chromosome 7D.
- Taxon
- wheatTriticum aestivume1
- Gene
- Dn2401e0
- Outcome
- short arm of chromosome 7De0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The gene, named Dn2401, was genetically mapped to the short arm of chromosome 7D”
e1“wheat ( Triticum aestivum L.)”
Claim · model-written summary
Marker Xbarc214 mapped 1.1 cM distal to wheat Dn2401.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Xbarc214 mapped 1.1 cM and Xgwm473 mapped 1.8 cM distal and proximal, respectively, to the gene”
e1“The gene, named Dn2401”
e2“wheat ( Triticum aestivum L.)”
Claim · model-written summary
Marker Xgwm473 mapped 1.8 cM proximal to wheat Dn2401.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Xbarc214 mapped 1.1 cM and Xgwm473 mapped 1.8 cM distal and proximal, respectively, to the gene”
e1“The gene, named Dn2401”
e2“wheat ( Triticum aestivum L.)”
Claim · model-written summary
Marker association showed a major wheat RWA2 resistance signal on chromosome 7DS.
- Taxon
- wheatTriticum aestivume1
- Interactor
- RWA2 aphidse2pest
- Gene
- chromosome 7DSe0
- Outcome
- major signal associated with resistancee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Association studies using more than 12,000 SNPs and SilicoDArTs confirmed the presence of a major signal associated with resistance on chromosome 7DS”
e1“wheat ( Triticum aestivum L.)”
e2“RWA2 aphids”
Claim · model-written summary
Marker association also detected a minor wheat resistance signal on chromosome 1D.
- Taxon
- wheatTriticum aestivume1
- Gene
- chromosome 1De0
- Outcome
- minor signale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a minor signal was detected in chromosome 1D”
e1“wheat ( Triticum aestivum L.)”
Claim · model-written summary
The authors concluded that the wheat markers could aid marker-assisted breeding for RWA2 resistance.
- Taxon
- wheatTriticum aestivume1
- Interactor
- RWA2e0pest
- Outcome
- marker-assisted-breeding for resistance to RWA2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The markers developed in this study will be useful for marker-assisted-breeding for resistance to RWA2”
e1“wheat ( Triticum aestivum L.)”