Claim · model-written summary
The recessive lutescence factor produces small inconspicuous infection spots on genetically immune tomato plants, whose growth is arrested soon after symptoms appear.
- Taxon
- tomatoes
Solanum lycopersicume0 - Material
- genetically immune individualse4
- Gene
- recessive lutescence factore3
- Outcome
- small inconspicuous infection spotse4
- Qualifier
- whose increase in size is arrested very soon after symptoms appeare4
Not reportedCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingDirectionValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“causal agent of the leaf mold disease of tomatoes”
e3“Conspicuous among the genetic factors in the host which modify the main reaction types is the recessive lutescence factor in the homozygous condition”
e4“Its most striking effect is the production, on genetically immune individuals, of small inconspicuous infection spots whose increase in size is arrested very soon after symptoms appear”
Title
THE PARASITISM OF CLADOSPORIUM FULVUM COOKE AND THE GENETICS OF RESISTANCE TO IT
Arthur N. Langford Canadian Journal of Research/Canadian journal of research 1937. doi:10.1139/cjr37c-008
Other claims from this paper (12)
- Observation Four physiologic forms of Cladosporium fulvum were differentiated by differences in pathogenicity on tomato.
- Observation Saltant strains of Cladosporium fulvum were isolated repeatedly from cultures arising from single one-celled spores.
- Observation Cladosporium fulvum reactions on tomato form four main classes: complete susceptibility, two types of partial resistance, and immunity.
- Observation The reaction between pure lines of tomato and the fungus is plastic.
- Observation Environmental conditions cause variations in each of the four tomato reaction types to Cladosporium fulvum.
- Observation Seasonal fluctuations in the reaction of Lycopersicon esculentum var. Stirling Castle to physiologic Form 1 are outstanding.
- Mechanism Failure of the inherent resistance of Stirling Castle in midwinter at Toronto is largely due to the reduced light experience of plants grown at that time.
- Mechanism Failure of plants to support sporulation of Cladosporium fulvum is caused by the low relative humidity in the greenhouses.
- Observation The Red Currant tomato carries an independently segregating dominant factor that governs resistance to all four forms of Cladosporium fulvum.
- Observation Resistance of Stirling Castle to Cladosporium fulvum Forms 1 and 3 is due to another dominant factor.
- Observation A recessive lutescence factor in the homozygous condition modifies the main reaction types of tomato to Cladosporium fulvum.
- Observation Three resistance factors of tomato were located on MacArthur chromosome maps by linkage studies.