Abstract
Sheath blight (ShB) caused by the soil-borne pathogen Rhizoctonia solani is one of the most devastating diseases in rice world-wide. Global attention has focused on examining individual mapping populations for quantitative trait loci (QTLs) for ShB resistance, but to date no study has taken advantage of association mapping to examine hundreds of lines for potentially novel QTLs. Our objective was to identify ShB QTLs via association mapping in rice using 217 sub-core entries from the USDA rice core collection, which were phenotyped with a micro-chamber screening method and genotyped with 155 genome-wide markers. Structure analysis divided the mapping panel into five groups, and model comparison revealed that PCA5 with genomic control was the best model for association mapping of ShB. Ten marker loci on seven chromosomes were significantly associated with response to the ShB pathogen. Among multiple alleles in each identified loci, the allele contributing the greatest effect to ShB resistance was named the putative resistant allele. Among 217 entries, entry GSOR 310389 contained the most putative resistant alleles, eight out of ten. The number of putative resistant alleles presented in an entry was highly and significantly correlated with the decrease of ShB rating (r = -0.535) or the increase of ShB resistance. Majority of the resistant entries that contained a large number of the putative resistant alleles belonged to indica, which is consistent with a general observation that most ShB resistant accessions are of indica origin. These findings demonstrate the potential to improve breeding efficiency by using marker-assisted selection to pyramid putative resistant alleles from various loci in a cultivar for enhanced ShB resistance in rice.
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Claims 7
Claim · model-written summary
The mapping panel divided into five groups.
- Taxon
- Rice
Oryza sativat0 - Outcome
- five groupse0
- Value
- five groupse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Structure analysis divided the mapping panel into five groups”
t0“Rice”
Claim · model-written summary
PCA5 with genomic control was the best model for sheath blight association mapping.
- Taxon
- RiceOryza sativat0
- Outcome
- best modele0
- Comparator
- PCA5 with genomic controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“model comparison revealed that PCA5 with genomic control was the best model for association mapping of ShB”
t0“Rice”
Claim · model-written summary
Ten marker loci on seven chromosomes were significantly associated with sheath blight response.
- Taxon
- RiceOryza sativat0
- Interactor
- ShB pathogene0pathogen
- Gene
- marker locie0
- Outcome
- response to the ShB pathogene0
- Value
- Ten marker loci on seven chromosomese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ten marker loci on seven chromosomes were significantly associated with response to the ShB pathogen”
t0“Rice”
Claim · model-written summary
GSOR 310389 had the most putative resistant alleles, eight of ten.
- Taxon
- RiceOryza sativat0
- Material
- GSOR 310389e0
- Outcome
- putative resistant allelese0
- Direction
- moste0
- Value
- eight out of tene0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“entry GSOR 310389 contained the most putative resistant alleles, eight out of ten”
t0“Rice”
Claim · model-written summary
More putative resistant alleles correlated with decreased sheath blight rating.
- Taxon
- RiceOryza sativat0
- Gene
- putative resistant allelese0
- Outcome
- ShB ratinge0
- Direction
- decreasee0
- Value
- r = -0.535e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The number of putative resistant alleles presented in an entry was highly and significantly correlated with the decrease of ShB rating (r = -0.535)”
t0“Rice”
Claim · model-written summary
Most resistant entries with many putative resistant alleles were indica.
- Taxon
- RiceOryza sativat0
- Material
- indicae0
- Outcome
- resistant entriese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Majority of the resistant entries that contained a large number of the putative resistant alleles belonged to indica”
t0“Rice”
Claim · model-written summary
The authors propose pyramiding resistant alleles by marker-assisted selection to improve sheath blight resistance.
- Taxon
- riceOryza sativae0
- Gene
- putative resistant allelese0
- Outcome
- enhanced ShB resistancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“using marker-assisted selection to pyramid putative resistant alleles from various loci in a cultivar for enhanced ShB resistance in rice”