Abstract
BACKGROUND: Stripe rust (also called yellow rust) is a common and serious fungal disease of wheat (Triticum aestivum L.) caused by Puccinia striiformis f. sp. tritici. The narrow genetic basis of modern wheat cultivars and rapid evolution of the rust pathogen have been responsible for periodic and devastating epidemics of wheat rust diseases. In this study, we conducted a genome-wide association study with 44,059 single nucleotide polymorphism markers to identify loci associated with resistance to stripe rust in 244 Sichuan wheat accessions, including 79 landraces and 165 cultivars, in six environments. RESULTS: In all the field assessments, 24 accessions displayed stable high resistance to stripe rust. Significant correlations among environments were observed for both infection (IT) and disease severity (DS), and high heritability levels were found for both IT and DS. Using mixed linear models, 12 quantitative trait loci (QTLs) significantly associated with IT and/or DS were identified. Two QTLs were mapped on chromosomes 5AS and 5AL and were distant from previously identified stripe rust resistance genes or QTL regions, indicating that they may be novel resistance loci. CONCLUSIONS: Our results revealed that resistance alleles to stripe rust were accumulated in Sichuan wheat germplasm, implying direct or indirect selection for improved stripe rust resistance in elite wheat breeding programs. The identified stable QTLs or favorable alleles could be important chromosome regions in Sichuan wheat that controlled the resistance to stripe rust. These markers can be used molecular marker-assisted breeding of Sichuan wheat cultivars, and will be useful in the ongoing effort to develop new wheat cultivars with strong resistance to stripe rust.
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Claims 7
Claim · model-written summary
Twenty-four Sichuan wheat accessions displayed stable high resistance to stripe rust in all field assessments.
- Taxon
- wheat
Triticum aestivumt0 - Interactor
- Puccinia striiformis f. sp. tritici
Puccinia striiformis f. sp. triticit1pathogen - Outcome
- stable high resistance to stripe ruste0
- Value
- 24 accessionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sichuan wheat”
t1“Puccinia striiformis f. sp. tritici”
e0“24 accessions displayed stable high resistance to stripe rust”
Claim · model-written summary
Significant correlations among environments were observed for both infection type and disease severity of stripe rust in wheat.
- Taxon
- wheatTriticum aestivumt0
- Interactor
- Puccinia striiformis f. sp. triticiPuccinia striiformis f. sp. triticit1pathogen
- Outcome
- infection (IT) and disease severity (DS)e0
- Setting
- environmentse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sichuan wheat”
t1“Puccinia striiformis f. sp. tritici”
e0“Significant correlations among environments were observed for both infection (IT) and disease severity (DS)”
Claim · model-written summary
High heritability levels were found for both infection type and disease severity of stripe rust in wheat.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- high heritability levelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sichuan wheat”
e0“high heritability levels were found for both IT and DS”
Claim · model-written summary
Using mixed linear models, 12 QTLs significantly associated with infection type and/or disease severity of stripe rust were identified in Sichuan wheat.
- Taxon
- wheatTriticum aestivumt0
- Gene
- quantitative trait loci (QTLs)e0
- Outcome
- significantly associated with IT and/or DSe0
- Value
- 12e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sichuan wheat”
e0“12 quantitative trait loci (QTLs) significantly associated with IT and/or DS were identified”
Claim · model-written summary
Two QTLs mapped on chromosomes 5AS and 5AL were distant from previously identified stripe rust resistance genes or QTL regions, indicating they may be novel resistance loci.
- Taxon
- wheatTriticum aestivumt0
- Gene
- QTLse0
- Outcome
- mapped on chromosomes 5AS and 5ALe0
- Value
- Twoe0
- Qualifier
- may be novel resistance locie0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sichuan wheat”
e0“Two QTLs were mapped on chromosomes 5AS and 5AL and were distant from previously identified stripe rust resistance genes or QTL regions, indicating that they may be novel resistance loci”
Claim · model-written summary
Resistance alleles to stripe rust accumulated in Sichuan wheat germplasm, implying direct or indirect selection for improved stripe rust resistance in elite wheat breeding programs.
- Taxon
- wheatTriticum aestivume0
- Outcome
- resistance alleles to stripe rust were accumulatede0
- Qualifier
- implying direct or indirect selection for improved stripe rust resistancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“resistance alleles to stripe rust were accumulated in Sichuan wheat germplasm, implying direct or indirect selection for improved stripe rust resistance in elite wheat breeding programs”
Claim · model-written summary
The identified markers can be used in molecular marker-assisted breeding of Sichuan wheat cultivars.
- Taxon
- wheatTriticum aestivume0
- Outcome
- molecular marker-assisted breedinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These markers can be used molecular marker-assisted breeding of Sichuan wheat cultivars”