Abstract
A survey of the relative incidence of anastomosis groups (AGs) of Rhizoctonia spp. associated with potato disease was conducted in Idaho, the leading potato producing state in the U.S.A. In total, 169 isolates of Rhizoctonia solani and seven binucleate Rhizoctonia (BNR) isolates were recovered from diseased potato plants. The AG of each isolate was determined through real-time PCR assays for AG 3-PT and phylogenetic analysis of the internal transcribed spacer region of ribosomal DNA. AG 3-PT was the predominant AG, accounting for 85% of isolates recovered, followed by AG 2-1 (5.7%) and AG 4 HG-II (4.5%). Two different subsets of AG 2-1 isolates were recovered (subset 2 and 3). Three isolates each of AG A and AG K were recovered, as well as one isolate each of AG 5 and AG W. An experiment carried out under greenhouse conditions with representative isolates of the different AGs recovered from Idaho potatoes showed differences in aggressiveness between AGs to potato stems, with AG 3-PT being the most aggressive followed by an isolate of AG 2-1 (subset 3). The three BNR isolates representative of AG A, AG K, and AG W appeared to be less aggressive to potato stems than the R. solani isolates except for the AG 2-1 (subset 2) isolate. This is the first comprehensive study of the relative incidences of Rhizoctonia species associated with Idaho potatoes and the first study to report the presence of BNR AG W outside of China.
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Claims 14
Claim · model-written summary
169 R. solani isolates were recovered from diseased potato.
- Taxon
- potato
Solanum tuberosume0 - Interactor
- Rhizoctonia solani
Rhizoctonia solanie0pathogen - Outcome
- Rhizoctonia solanie0
- Value
- 169 isolatese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“169 isolates of Rhizoctonia solani and seven binucleate Rhizoctonia (BNR) isolates were recovered from diseased potato plants.”
Claim · model-written summary
Seven binucleate Rhizoctonia isolates were recovered from diseased potato.
- Taxon
- potatoSolanum tuberosume0
- Interactor
- binucleate Rhizoctoniae0pathogen
- Outcome
- binucleate Rhizoctonia (BNR) isolatese0
- Value
- seven binucleate Rhizoctonia (BNR) isolatese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seven binucleate Rhizoctonia (BNR) isolates were recovered from diseased potato plants.”
Claim · model-written summary
AG 3-PT accounted for 85% of recovered isolates.
Not reportedTaxon
Verbatim
e0“AG 3-PT was the predominant AG, accounting for 85% of isolates recovered”
Claim · model-written summary
AG 2-1 accounted for 5.7% of recovered isolates.
Not reportedTaxon
Verbatim
e0“AG 2-1 (5.7%)”
Claim · model-written summary
AG 4 HG-II accounted for 4.5% of recovered isolates.
Not reportedTaxon
Verbatim
e0“AG 4 HG-II (4.5%)”
Claim · model-written summary
Two AG 2-1 subsets were recovered.
Not reportedTaxon
Verbatim
e0“Two different subsets of AG 2-1 isolates were recovered (subset 2 and 3).”
Claim · model-written summary
Three AG A isolates were recovered.
Not reportedTaxon
Verbatim
e0“Three isolates each of AG A and AG K were recovered”
Claim · model-written summary
Three AG K isolates were recovered.
Not reportedTaxon
Verbatim
e0“Three isolates each of AG A and AG K were recovered”
Claim · model-written summary
One AG 5 isolate was recovered.
Not reportedTaxon
Verbatim
e0“one isolate each of AG 5 and AG W.”
Claim · model-written summary
One AG W isolate was recovered.
Not reportedTaxon
Verbatim
e0“one isolate each of AG 5 and AG W.”
Claim · model-written summary
AG 3-PT was most aggressive to potato stems.
Not reportedTaxon
Verbatim
e0“AG 3-PT being the most aggressive followed by an isolate of AG 2-1 (subset 3).”
Claim · model-written summary
An AG 2-1 subset 3 isolate ranked second in aggressiveness.
Not reportedTaxon
Verbatim
e0“followed by an isolate of AG 2-1 (subset 3).”
Claim · model-written summary
Three BNR groups were less aggressive than most R. solani isolates.
- Taxon
- potatoSolanum tuberosume0
- Interactor
- BNR isolatese0pathogen
- Outcome
- aggressive to potato stemse0
- Direction
- less aggressivee0
- Comparator
- R. solani isolatese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The three BNR isolates representative of AG A, AG K, and AG W appeared to be less aggressive to potato stems than the R. solani isolates except for the AG 2-1 (subset 2) isolate.”
Claim · model-written summary
BNR AG W was reported outside China.
Not reportedTaxon
Verbatim
e0“the first study to report the presence of BNR AG W outside of China.”