Abstract
Abstract The host pathogen interaction between Lactuca sativa and Bremia lactucae fits a gene‐for‐gene model well. Twelve resistance genes of the host are matched by twelve genes for virulence in the pathogen. The evolution of the parasite involves drastic changes in virulence frequencies, and a great diversity in virulence even on a sub‐poipulation level. Bremia is a heterothallic, obligate parasite, in which presence of two mating types is needed for sexual reproduction. Sexual recombination probably occurs frequently, indicated by simultaneous occurrence of mating types in commercial lettuce crops, zygote formation, and sufficiently high oospore germination. The pattern of variation agrees well with that of a diploid, out‐ crossing organism with frequent sexual recombination. Unexpected high frequencies of some of the unnecessary v‐genes are probably due to genetic linkage with another “necessary” v‐gene.
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Claims 6
Claim · model-written summary
The Lactuca sativa–Bremia lactucae interaction fits a gene-for-gene model.
- Taxon
- Lactuca sativa
Lactuca sativae0 - Interactor
- Bremia lactucae
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Bremia lactucaee0pathogen - Outcome
- fits a gene‐for‐gene model welle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“The host pathogen interaction between Lactuca sativa and Bremia lactucae fits a gene‐for‐gene model well”
Claim · model-written summary
Twelve host resistance genes correspond to twelve pathogen virulence genes.
- Taxon
- Lactuca sativaLactuca sativae1
- Interactor
- Bremia lactucaeBremia lactucaee1pathogen
- Outcome
- Twelve resistance genes of the host are matched by twelve genes for virulence in the pathogene0
- Value
- Twelve resistance genese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Twelve resistance genes of the host are matched by twelve genes for virulence in the pathogen”
e1“Lactuca sativa and Bremia lactucae”
Claim · model-written summary
Bremia virulence frequencies change drastically and vary greatly within subpopulations.
- Taxon
- Lactuca sativaLactuca sativae1
- Interactor
- Bremia lactucaeBremia lactucaee1pathogen
- Outcome
- virulence frequenciese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The evolution of the parasite involves drastic changes in virulence frequencies, and a great diversity in virulence even on a sub‐poipulation level”
e1“Lactuca sativa and Bremia lactucae”
Claim · model-written summary
Bremia sexual recombination probably occurs frequently in lettuce crops.
- Taxon
- Lactuca sativaLactuca sativae1
- Interactor
- Bremia lactucaeBremia lactucaee1pathogen
- Outcome
- Sexual recombination probably occurs frequentlye0
- Setting
- commercial lettuce cropse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sexual recombination probably occurs frequently, indicated by simultaneous occurrence of mating types in commercial lettuce crops, zygote formation, and sufficiently high oospore germination”
e1“Lactuca sativa and Bremia lactucae”
Claim · model-written summary
Variation is consistent with a diploid outcrossing organism with frequent recombination.
- Taxon
- Lactuca sativaLactuca sativae1
- Interactor
- Bremia lactucaeBremia lactucaee1pathogen
- Outcome
- pattern of variatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The pattern of variation agrees well with that of a diploid, out‐ crossing organism with frequent sexual recombination”
e1“Lactuca sativa and Bremia lactucae”
Claim · model-written summary
High frequencies of unnecessary virulence genes are probably due to linkage with necessary virulence genes.
- Taxon
- Lactuca sativaLactuca sativae1
- Interactor
- Bremia lactucaeBremia lactucaee1pathogen
- Gene
- v‐genese0
- Outcome
- high frequencies of some of the unnecessary v‐genese0
- Qualifier
- genetic linkage with another “necessary” v‐genee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Unexpected high frequencies of some of the unnecessary v‐genes are probably due to genetic linkage with another “necessary” v‐gene”
e1“Lactuca sativa and Bremia lactucae”