Abstract
ABSTRACT White leaf spot, caused by the fungal pathogen Neopseudocercosporella capsellae , is a re‐emerging disease of canola ( Brassica napus ), as its incidence and severity have increased over recent years. The disease primarily affects leaves but can also infect stems and siliques, and has resulted in considerable yield losses, particularly in Australia. Despite this, there is limited research into genetic resistance and no white leaf spot resistance quantitative trait locus (QTL) or resistance genes have been reported in any Brassica species. In this study, we identify genomic regions associated with white leaf spot resistance based on genome‐wide association studies (GWAS) conducted on a panel of 215 B. napus genotypes. The genotypes were screened for both cotyledon and leaf resistance, and displayed varying levels of resistance ranging from highly susceptible to completely resistant. GWAS identified five genomic regions, one on chromosome A07, two on chromosome A09 and three on chromosome C04, that were associated with either cotyledon or leaf resistance. Putative resistance genes within these regions were identified and can be further investigated. This is the first study to map genetic resistance for white leaf spot and offers initial insights into the genetic basis of resistance. The identified regions can be targeted in breeding programmes to bolster white leaf spot resistance in elite germplasm.
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Claims 7
Claim · model-written summary
GWAS identified five genomic regions associated with cotyledon or leaf resistance to white leaf spot in Brassica napus.
- Taxon
- Brassica napus
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napust0 - Material
- a panel of 215 B. napus genotypese3
- Interactor
- Neopseudocercosporella capsellaeNeopseudocercosporella capsellaee0pathogen
- Outcome
- cotyledon or leaf resistancee1
- Value
- fivee1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“White leaf spot, caused by the fungal pathogen Neopseudocercosporella capsellae”
e1“GWAS identified five genomic regions, one on chromosome A07, two on chromosome A09 and three on chromosome C04, that were associated with either cotyledon or leaf resistance”
e3“a panel of 215 B. napus genotypes”
t0“Brassica napus”
Claim · model-written summary
One genomic region on chromosome A07 is associated with cotyledon or leaf resistance to white leaf spot.
- Taxon
- Brassica napusBrassica napust0
- Interactor
- Neopseudocercosporella capsellaeNeopseudocercosporella capsellaee0pathogen
- Outcome
- cotyledon or leaf resistancee1
- Value
- onee1
- Qualifier
- on chromosome A07e1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“White leaf spot, caused by the fungal pathogen Neopseudocercosporella capsellae”
e1“GWAS identified five genomic regions, one on chromosome A07, two on chromosome A09 and three on chromosome C04, that were associated with either cotyledon or leaf resistance”
t0“Brassica napus”
Claim · model-written summary
Two genomic regions on chromosome A09 are associated with cotyledon or leaf resistance to white leaf spot.
- Taxon
- Brassica napusBrassica napust0
- Interactor
- Neopseudocercosporella capsellaeNeopseudocercosporella capsellaee0pathogen
- Outcome
- cotyledon or leaf resistancee1
- Value
- twoe1
- Qualifier
- on chromosome A09e1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“White leaf spot, caused by the fungal pathogen Neopseudocercosporella capsellae”
e1“GWAS identified five genomic regions, one on chromosome A07, two on chromosome A09 and three on chromosome C04, that were associated with either cotyledon or leaf resistance”
t0“Brassica napus”
Claim · model-written summary
Three genomic regions on chromosome C04 are associated with cotyledon or leaf resistance to white leaf spot.
- Taxon
- Brassica napusBrassica napust0
- Interactor
- Neopseudocercosporella capsellaeNeopseudocercosporella capsellaee0pathogen
- Outcome
- cotyledon or leaf resistancee1
- Value
- threee1
- Qualifier
- on chromosome C04e1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“White leaf spot, caused by the fungal pathogen Neopseudocercosporella capsellae”
e1“GWAS identified five genomic regions, one on chromosome A07, two on chromosome A09 and three on chromosome C04, that were associated with either cotyledon or leaf resistance”
t0“Brassica napus”
Claim · model-written summary
The genotype panel displayed varying levels of white leaf spot resistance, from highly susceptible to completely resistant.
- Taxon
- Brassica napusBrassica napust0
- Material
- a panel of 215 B. napus genotypese3
- Outcome
- resistancee4
- Qualifier
- ranging from highly susceptible to completely resistante4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“a panel of 215 B. napus genotypes”
e4“displayed varying levels of resistance ranging from highly susceptible to completely resistant”
t0“Brassica napus”
Claim · model-written summary
Putative resistance genes were identified within the five genomic regions.
- Taxon
- Brassica napusBrassica napust0
- Outcome
- Putative resistance genese5
- Qualifier
- within these regionse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Putative resistance genes within these regions were identified and can be further investigated”
t0“Brassica napus”
Claim · model-written summary
The identified regions can be targeted in Brassica napus breeding programmes to bolster white leaf spot resistance.
- Taxon
- Brassica napusBrassica napust0
- Outcome
- targeted in breeding programmese6
- Qualifier
- to bolster white leaf spot resistance in elite germplasme6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“The identified regions can be targeted in breeding programmes to bolster white leaf spot resistance in elite germplasm”
t0“Brassica napus”