Abstract
Crown rust is the most widespread and damaging disease of oat (Avena species). Genetic resistance to the pathogen is the preferred method for crop protection but widespread deployment of limited numbers of major effect genes has promoted the rapid emergence and spread of pathogen races that are able to overcome these genes. Combining genes with even partial resistance may help develop durable cultivars that are less vulnerable to changes in pathogen virulence. Partial resistance is expected to be relatively common in populations of wild species where constant pathogen pressure encourages diversity in host resistance mechanisms, but it may be discarded in conventional screens for major gene resistance. Here, we used a detached leaf assay to detect resistance to the crown rust pathogen, Puccinia coronata Cda. f. sp. avenae, in previously uncharacterized collections of the hexaploid wild oat relative A. sterilis made by the Polish National Centre for Plant Genetic Resources. Many of the accessions were collected in Morocco, the center of diversity for the Avena genus. The detached leaf assessment allowed individual plants to be challenged with multiple pathotypes and their responses compared with 34 known differentials. Broad-spectrum resistance was identified within accession PL 51855, which behaved as a single major locus on crossing to three cultivars. The locus provided resistance to over 50 rust pathotypes, a greater range than seen for any of the known host resistance (Pc) genes. Strong resistance was identified in other accessions, and heterogeneity in response within accessions was common. Several accessions show multiple partial resistance responses that may be of value for developing durable resistance in cultivars. Because the sources of resistance in all but two differential lines were collected outside of Morocco, resistance in all accessions tested here are potentially novel. This study demonstrates that diversity within A. sterilis accessions collected in Morocco could be a very valuable source of resistance to crown rust, and it provides new germplasm for use in resistance breeding programs. Detached leaf assessment provides a valuable first step in the identification of promising candidates in complex gene bank accessions.
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Claims 9
Claim · model-written summary
Detached leaf assessment enabled multiple pathotype challenges and comparison with differentials.
- Taxon
- Avena sterilis
Avena sterilist0 - Interactor
- pathotypese0pathogen
- Outcome
- responses comparede0
- Value
- 34 known differentialse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The detached leaf assessment allowed individual plants to be challenged with multiple pathotypes and their responses compared with 34 known differentials.”
t0“Avena sterilis”
Claim · model-written summary
Accession PL 51855 showed broad-spectrum resistance.
- Taxon
- Avena sterilisAvena sterilist0
- Material
- PL 51855e0
- Outcome
- Broad-spectrum resistancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Broad-spectrum resistance was identified within accession PL 51855”
t0“Avena sterilis”
Claim · model-written summary
Resistance in PL 51855 behaved as a single major locus in crosses to three cultivars.
- Taxon
- Avena sterilisAvena sterilist0
- Material
- PL 51855e0
- Outcome
- single major locuse0
- Value
- three cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Broad-spectrum resistance was identified within accession PL 51855, which behaved as a single major locus on crossing to three cultivars”
t0“Avena sterilis”
Claim · model-written summary
The locus resisted over 50 rust pathotypes, exceeding known Pc genes.
- Taxon
- Avena sterilisAvena sterilist0
- Interactor
- rust pathotypese0pathogen
- Outcome
- resistance to over 50 rust pathotypese0
- Value
- over 50 rust pathotypese0
- Comparator
- known host resistance (Pc) genese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The locus provided resistance to over 50 rust pathotypes, a greater range than seen for any of the known host resistance (Pc) genes.”
t0“Avena sterilis”
Claim · model-written summary
Other accessions showed strong resistance.
- Taxon
- Avena sterilisAvena sterilist0
- Outcome
- Strong resistancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Strong resistance was identified in other accessions”
t0“Avena sterilis”
Claim · model-written summary
Responses commonly varied within accessions.
- Taxon
- Avena sterilisAvena sterilist0
- Outcome
- heterogeneity in response within accessionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“heterogeneity in response within accessions was common”
t0“Avena sterilis”
Claim · model-written summary
Several accessions displayed multiple partial resistance responses.
- Taxon
- Avena sterilisAvena sterilist0
- Outcome
- multiple partial resistance responsese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Several accessions show multiple partial resistance responses”
t0“Avena sterilis”
Claim · model-written summary
Moroccan accessions were identified as valuable crown rust resistance sources for breeding.
- Taxon
- Avena sterilisAvena sterilist0
- Outcome
- source of resistance to crown ruste0
- Setting
- Moroccoe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“diversity within A. sterilis accessions collected in Morocco could be a very valuable source of resistance to crown rust”
t0“Avena sterilis”
Claim · model-written summary
Detached leaf assessment was recommended as an initial way to identify candidates in complex gene bank accessions.
- Taxon
- Avena sterilisAvena sterilist0
- Outcome
- identification of promising candidatese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Detached leaf assessment provides a valuable first step in the identification of promising candidates in complex gene bank accessions.”
t0“Avena sterilis”