Abstract
Abstract Five physiological populations of Gymnosporangium juniperi‐virginianae Schw. were identified on the basis of pycnial and aecial lesion formation when seven apple cultivars grown in a glasshouse were inoculated with basidiospores of rust populations collected from six locations in the U.S.A. The relationship between cultivars and rust populations was explored quantitatively using the parameters N, D, and DR, where N was the highest number of pycnial lesions on a leaf/plant; D was the largestdiameter measurement of pycnial lesions on a leaf/plant; and DR, the disease rating, was proportional to the diseased area of the leaf and calculated as ND 2 . Statistically significant differences among cultivars over all rust populations for variables N, D, and DR were obtained, indicating the possible existence of race non‐specific resistance in apple to cedar‐apple rust. Moreover, significant differences among the rust populations over all cultivars for variable N and DR were obtained, confirming the existence of physiologically different rust populations of the pathogen. A change in the pathogenicities of these physiological populations must have occurred over time (10‐year period). A significant interaction between cultivars and rust populations was observed for lesion size (D) only, indicating a probable existence of race specific resistance in apple as well.
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Claims 11
Claim · model-written summary
Five physiological rust populations were identified from lesion formation on apple cultivars.
- Taxon
- apple
Malus domesticae0 - Interactor
- Gymnosporangium juniperi‐virginianaee0pathogen
- Outcome
- Five physiological populationse0
- Value
- Fivee0
- Setting
- glasshousee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Five physiological populations of Gymnosporangium juniperi‐virginianae Schw. were identified on the basis of pycnial and aecial lesion formation when seven apple cultivars grown in a glasshouse were inoculated with basidiospores of rust populations collected from six locations in the U.S.A.”
Claim · model-written summary
Apple cultivars differed significantly in maximum number of pycnial lesions across rust populations.
- Taxon
- appleMalus domesticat0
- Material
- cultivarse0
- Interactor
- rust populationse0pathogen
- Outcome
- Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Statistically significant differences among cultivars over all rust populations for variables N, D, and DR were obtained”
t0“Apple Cultivars”
Claim · model-written summary
Apple cultivars differed significantly in pycnial lesion diameter across rust populations.
- Taxon
- appleMalus domesticat0
- Material
- cultivarse0
- Interactor
- rust populationse0pathogen
- Outcome
- De0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Statistically significant differences among cultivars over all rust populations for variables N, D, and DR were obtained”
t0“Apple Cultivars”
Claim · model-written summary
Apple cultivars differed significantly in disease rating across rust populations.
- Taxon
- appleMalus domesticat0
- Material
- cultivarse0
- Interactor
- rust populationse0pathogen
- Outcome
- DRe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Statistically significant differences among cultivars over all rust populations for variables N, D, and DR were obtained”
t0“Apple Cultivars”
Claim · model-written summary
Cultivar differences suggested race-nonspecific apple resistance to cedar-apple rust.
- Taxon
- appleMalus domesticae0
- Interactor
- cedar‐apple rust
Gymnosporangium juniperi-virginianaee0pathogen - Outcome
- race non‐specific resistancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“indicating the possible existence of race non‐specific resistance in apple to cedar‐apple rust.”
Claim · model-written summary
Rust populations differed significantly in pycnial lesion count across apple cultivars.
- Taxon
- appleMalus domesticat0
- Interactor
- rust populationse0pathogen
- Outcome
- Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant differences among the rust populations over all cultivars for variable N and DR were obtained”
t0“Apple Cultivars”
Claim · model-written summary
Rust populations differed significantly in disease rating across apple cultivars.
- Taxon
- appleMalus domesticat0
- Interactor
- rust populationse0pathogen
- Outcome
- DRe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant differences among the rust populations over all cultivars for variable N and DR were obtained”
t0“Apple Cultivars”
Claim · model-written summary
Rust population differences confirmed physiologically different pathogen populations.
- Taxon
- appleMalus domesticat0
- Interactor
- pathogene0pathogen
- Outcome
- physiologically different rust populationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“confirming the existence of physiologically different rust populations of the pathogen.”
t0“Apple Cultivars”
Claim · model-written summary
The authors inferred that pathogenicity changed over a ten-year period.
- Taxon
- appleMalus domesticat0
- Interactor
- Cedar‐Apple RustGymnosporangium juniperi-virginianaet0pathogen
- Outcome
- change in the pathogenicitiese0
- Value
- 10‐year periode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A change in the pathogenicities of these physiological populations must have occurred over time (10‐year period).”
t0“Apple Cultivars with Populations of Cedar‐Apple Rust”
Claim · model-written summary
Apple cultivar and rust population interacted significantly for lesion size.
- Taxon
- appleMalus domesticat0
- Material
- cultivarse0
- Interactor
- rust populationse0pathogen
- Outcome
- lesion size (D)e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A significant interaction between cultivars and rust populations was observed for lesion size (D) only”
t0“Apple Cultivars”
Claim · model-written summary
The lesion-size interaction suggested race-specific resistance in apple.
- Taxon
- appleMalus domesticae0
- Interactor
- Cedar‐Apple RustGymnosporangium juniperi-virginianaet0pathogen
- Outcome
- race specific resistancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“indicating a probable existence of race specific resistance in apple as well.”
t0“Cedar‐Apple Rust”