Abstract
Abstract Caucasian alder ( Alnus subcordata ) is among the major constituents of the Hyrcanian forests extending all along the southern coast of the Caspian Sea in northern Iran. An angular leaf spot with a yellowish chlorotic halo has attained a widespread occurrence throughout the forest and suburban areas of the northern provinces including Guilan, Mazandaran and Golestan. Strains of a Xanthomonas sp. were consistently isolated from the symptomatic leaves of A. subcordata . Colonies of the isolates were yellow circular, convex and mucoid on nutrient agar containing glucose or sucrose. In multilocus sequence analysis using the genes gyrB , rpoD , dnaK , gltA , fyuA and gapA , the representative isolates occupied a clade shared by the known pathovars of Xanthomonas arboricola . The isolates were relatively heterogeneous phenotypically, but more so in their rep‐PCR fingerprints. Pathogenicity of several isolates was confirmed on seedlings of A . subcordata and Alnus rhombifolia , whereas Alnus cordata , Alnus glutinosa and Alnus crispa appeared not to be susceptible. Based on these characteristics, the isolates causing angular leaf spots of Caucasian alder appear to represent a novel pathovar of X. arboricola .
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Claims 7
Claim · model-written summary
Xanthomonas strains were consistently isolated from symptomatic leaves of Caucasian alder.
- Taxon
- Alnus subcordata
Alnus subcordatae0 - Interactor
- Xanthomonas sp.
_-_Howard_F._Schwartz%2C_Colorado_State_University.jpg?width=60)
Xanthomonase1pathogen - Outcome
- consistently isolatede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_-_Howard_F._Schwartz%2C_Colorado_State_University.jpg?width=500)
Verbatim
e0“Caucasian alder ( Alnus subcordata )”
e1“Strains of a Xanthomonas sp. were consistently isolated from the symptomatic leaves of A . subcordata”
Claim · model-written summary
Representative isolates occupied a clade shared by the known pathovars of Xanthomonas arboricola in multilocus sequence analysis.
- Taxon
- Alnus subcordataAlnus subcordatae0
- Interactor
- Xanthomonas arboricolaXanthomonas arboricolae2pathogen
- Outcome
- cladee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Caucasian alder ( Alnus subcordata )”
e2“the representative isolates occupied a clade shared by the known pathovars of Xanthomonas arboricola”
Claim · model-written summary
The isolates were relatively heterogeneous phenotypically.
- Taxon
- Alnus subcordataAlnus subcordatae0
- Outcome
- heterogeneouse3
- Qualifier
- phenotypicallye3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Caucasian alder ( Alnus subcordata )”
e3“The isolates were relatively heterogeneous phenotypically”
Claim · model-written summary
The isolates were more heterogeneous in their rep‐PCR fingerprints than phenotypically.
- Taxon
- Alnus subcordataAlnus subcordatae0
- Outcome
- heterogeneouse4
- Qualifier
- more so in their rep‐PCR fingerprintse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Caucasian alder ( Alnus subcordata )”
e4“The isolates were relatively heterogeneous phenotypically, but more so in their rep‐PCR fingerprints”
Claim · model-written summary
Several isolates were pathogenic on seedlings of Alnus subcordata and Alnus rhombifolia.
- Taxon
- Alnus subcordataAlnus subcordatae0
- Interactor
- Xanthomonas arboricolaXanthomonas arboricolat0pathogen
- Outcome
- Pathogenicitye5
- Qualifier
- Alnus rhombifoliae5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Caucasian alder ( Alnus subcordata )”
t0“incited by a pathovar of Xanthomonas arboricola”
e5“Pathogenicity of several isolates was confirmed on seedlings of A . subcordata and Alnus rhombifolia”
Claim · model-written summary
Alnus cordata, Alnus glutinosa and Alnus crispa appeared not to be susceptible.
- Taxon
- Alnus cordata, Alnus glutinosa and Alnus crispa
.jpg?width=60)
Alnus glutinosa
Alnus alnobetula subsp. crispa
Alnus cordatae6 - Outcome
- susceptiblee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Caucasian alder ( Alnus subcordata )”
e6“whereas Alnus cordata , Alnus glutinosa and Alnus crispa appeared not to be susceptible”
Claim · model-written summary
The causal isolates appear to represent a novel pathovar of Xanthomonas arboricola.
- Taxon
- Alnus subcordataAlnus subcordatae0
- Interactor
- Xanthomonas arboricolaXanthomonas arboricolat0pathogen
- Outcome
- novel pathovare7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Caucasian alder ( Alnus subcordata )”
t0“incited by a pathovar of Xanthomonas arboricola”
e7“the isolates causing angular leaf spots of Caucasian alder appear to represent a novel pathovar of X . arboricola”