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231225s2015 xx |||||o 00| ||eng c |
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|a 10.1094/PDIS-02-15-0236-RE
|2 doi
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|a eng
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1 |
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|a Muzhinji, N
|e verfasserin
|4 aut
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| 245 |
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|a Anastomosis Groups and Pathogenicity of Rhizoctonia solani and Binucleate Rhizoctonia from Potato in South Africa
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|c 2015
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|a Text
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|a ƒaComputermedien
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|a Date Revised 20.11.2019
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a A survey of anastomosis groups (AG) of Rhizoctonia spp. associated with potato diseases was conducted in South Africa. In total, 112 Rhizoctonia solani and 19 binucleate Rhizoctonia (BNR) isolates were recovered from diseased potato plants, characterized for AG and pathogenicity. The AG identity of the isolates was confirmed using phylogenetic analysis of the internal transcribed spacer region of ribosomal DNA. R. solani isolates recovered belonged to AG 3-PT, AG 2-2IIIB, AG 4HG-I, AG 4HG-III, and AG 5, while BNR isolates belonged to AG A and AG R, with frequencies of 74, 6.1, 2.3, 2.3, 0.8, 12.2, and 2.3%, respectively. R. solani AG 3-PT was the most predominant AG and occurred in all the potato-growing regions sampled, whereas the other AG occurred in distinct locations. Different AG grouped into distinct clades, with high maximum parsimony and maximum-likelihood bootstrap support for both R. solani and BNR. An experiment under greenhouse conditions with representative isolates from different AG showed differences in aggressiveness between and within AG. Isolates of AG 2-2IIIB, AG 4HG-III, and AG R were the most aggressive in causing stem canker while AG 3-PT, AG 5, and AG R caused black scurf. This is the first comprehensive survey of R. solani and BNR on potato in South Africa using a molecular-based approach. This is the first report of R. solani AG 2-2IIIB and AG 4 HG-I causing stem and stolon canker and BNR AG A and AG R causing stem canker and black scurf on potato in South Africa
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|a Journal Article
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1 |
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|a Truter, M
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Woodhall, J W
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| 700 |
1 |
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|a van der Waals, J E
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
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|g 99(2015), 12 vom: 31. Dez., Seite 1790-1802
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|g volume:99
|g year:2015
|g number:12
|g day:31
|g month:12
|g pages:1790-1802
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|u http://dx.doi.org/10.1094/PDIS-02-15-0236-RE
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