Abstract
In 2001, numerous Ya Li pear fruit from China with a disease apparently caused by an Alternaria sp. were intercepted at U.S. ports, raising concern because the disease was unknown in the United States. To identify the etiologic agent of the disease, single-spore cultures were established from intercepted fruit and were characterized by pathogenicity to wounded fruit, morphology, and sporulation pattern on three agar media, random amplified polymorphic DNA fragment pattern analysis, and species-specific polymerase chain reaction (PCR). These data indicated that the disease likely was caused by more than one species of Alternaria, and that none of the isolates from intercepted Ya Li fruit was A. alternata or A. gaisen. A species-specific PCR assay for A. gaisen demonstrated that no isolate from Ya Li was A. gaisen. A PCR assay for the AMT gene demonstrated that no isolate from Ya Li was A. 'mali'. Because of these data and the absence of a description to accommodate at least one of the taxa involved, A. yaliinficiens R. G. Roberts sp. nov. is described, and the disease caused by this and other species of Alternaria on Ya Li pear from China is referred to as "chocolate spot of Ya Li pear" to distinguish it from black spot of Japanese pear.
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Claims 7
Claim · model-written summary
The pear disease likely involved more than one Alternaria species.
- Taxon
- Ya Li peare1
- Interactor
- Alternaria
Alternariae0pathogen - Outcome
- disease likely was caused by more than one species of Alternariae0
- Setting
- Chinae1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the disease likely was caused by more than one species of Alternaria”
e1“Ya Li pear fruit from China”
Claim · model-written summary
None of the Alternaria isolates from Ya Li pear was A. alternata.
- Taxon
- Ya Li peare1
- Interactor
- A. alternata
.jpg?width=60)
Alternaria alternatae0pathogen - Outcome
- none of the isolates from intercepted Ya Li fruit was A. alternatae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“none of the isolates from intercepted Ya Li fruit was A. alternata or A. gaisen”
e1“Ya Li pear fruit”
Claim · model-written summary
None of the Alternaria isolates from Ya Li pear was A. gaisen.
- Taxon
- Ya Li peare1
- Interactor
- A. gaisenAlternaria gaisene0pathogen
- Outcome
- isolates from intercepted Ya Li fruite0
Verbatim
e0“none of the isolates from intercepted Ya Li fruit was A. alternata or A. gaisen”
e1“Ya Li pear fruit”
Claim · model-written summary
A species-specific PCR assay found no A. gaisen isolate from Ya Li.
- Taxon
- Ya Li peare1
- Interactor
- A. gaisenAlternaria gaisene0pathogen
- Outcome
- no isolate from Ya Li was A. gaisene0
Not reportedComparatorValue
Verbatim
e0“A species-specific PCR assay for A. gaisen demonstrated that no isolate from Ya Li was A. gaisen”
e1“Ya Li pear fruit”
Claim · model-written summary
An AMT PCR assay found no Ya Li isolate to be A. mali.
Verbatim
e0“A PCR assay for the AMT gene demonstrated that no isolate from Ya Li was A. 'mali'”
e1“Ya Li pear fruit”
Claim · model-written summary
The authors described A. yaliinficiens as a new species associated with Ya Li pear.
Verbatim
e0“A. yaliinficiens R. G. Roberts sp. nov. is described”
e1“Ya Li pear from China”
Claim · model-written summary
The authors named the Ya Li pear disease chocolate spot of Ya Li pear.
- Taxon
- Ya Li peare0
- Interactor
- AlternariaAlternariae0pathogen
- Outcome
- chocolate spot of Ya Li peare0
- Setting
- Chinae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the disease caused by this and other species of Alternaria on Ya Li pear from China is referred to as "chocolate spot of Ya Li pear"”
e1“black spot of Japanese pear”