Abstract
KEY MESSAGE: Multi-year evaluation of the Vavilov wheat diversity panel identified new sources of adult plant resistance to stripe rust. Genome-wide association studies revealed the key genomic regions influencing resistance, including seven novel loci. Wheat stripe rust (YR) caused by Puccinia striiformis f. sp. tritici (Pst) poses a significant threat to global food security. Resistance genes commonly found in many wheat varieties have been rendered ineffective due to the rapid evolution of the pathogen. To identify novel sources of adult plant resistance (APR), 292 accessions from the N.I. Vavilov Institute of Plant Genetic Resources, Saint Petersburg, Russia, were screened for known APR genes (i.e. Yr18, Yr29, Yr46, Yr33, Yr39 and Yr59) using linked polymerase chain reaction (PCR) molecular markers. Accessions were evaluated against Pst (pathotype 134 E16 A + Yr17 + Yr27) at seedling and adult plant stages across multiple years (2014, 2015 and 2016) in Australia. Phenotypic analyses identified 132 lines that potentially carry novel sources of APR to YR. Genome-wide association studies (GWAS) identified 68 significant marker-trait associations (P < 0.001) for YR resistance, representing 47 independent quantitative trait loci (QTL) regions. Fourteen genomic regions overlapped with previously reported Yr genes, including Yr29, Yr56, Yr5, Yr43, Yr57, Yr30, Yr46, Yr47, Yr35, Yr36, Yrxy1, Yr59, Yr52 and YrYL. In total, seven QTL (positioned on chromosomes 1D, 2A, 3A, 3D, 5D, 7B and 7D) did not collocate with previously reported genes or QTL, indicating the presence of promising novel resistance factors. Overall, the Vavilov diversity panel provides a rich source of new alleles which could be used to broaden the genetic bases of YR resistance in modern wheat varieties.
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Claims 7
Claim · model-written summary
Phenotypic analyses identified 132 wheat lines that potentially carry novel adult plant resistance to stripe rust.
- Taxon
- wheat
Triticum aestivumt0 - Interactor
- Puccinia striiformis f. sp. tritici
Puccinia striiformis f. sp. triticie2pathogen - Outcome
- lines that potentially carry novel sources of APR to YRe1
- Value
- 132 linese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat diversity panel”
e2“Wheat stripe rust (YR) caused by Puccinia striiformis f. sp. tritici”
e1“Phenotypic analyses identified 132 lines that potentially carry novel sources of APR to YR”
Claim · model-written summary
Genome-wide association identified 68 significant marker-trait associations for stripe rust resistance.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- marker-trait associationse2
- Value
- 68e2
- Qualifier
- P < 0.001e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat diversity panel”
e2“Genome-wide association studies (GWAS) identified 68 significant marker-trait associations (P < 0.001) for YR resistance”
Claim · model-written summary
The marker-trait associations represent 47 independent QTL regions for stripe rust resistance.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- independent quantitative trait loci (QTL) regionse3
- Value
- 47e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat diversity panel”
e3“representing 47 independent quantitative trait loci (QTL) regions”
Claim · model-written summary
Fourteen genomic regions overlapped with previously reported Yr genes.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- genomic regions overlapped with previously reported Yr genese4
- Value
- Fourteene4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat diversity panel”
e4“Fourteen genomic regions overlapped with previously reported Yr genes”
Claim · model-written summary
Seven QTL did not collocate with previously reported genes or QTL.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- QTLe5
- Value
- sevene5
- Qualifier
- did not collocate with previously reported genes or QTLe5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat diversity panel”
e5“In total, seven QTL (positioned on chromosomes 1D, 2A, 3A, 3D, 5D, 7B and 7D) did not collocate with previously reported genes or QTL”
Claim · model-written summary
The seven QTL indicate promising novel resistance factors.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- novel resistance factorse6
- Qualifier
- promisinge6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat diversity panel”
e6“indicating the presence of promising novel resistance factors”
Claim · model-written summary
The Vavilov diversity panel is a rich source of new alleles for broadening wheat stripe rust resistance.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- new allelese7
- Qualifier
- rich sourcee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat diversity panel”
e7“the Vavilov diversity panel provides a rich source of new alleles”