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• W2044515333 abstract "HomePlant DiseaseVol. 99, No. 8First Report of Rhizoctonia solani AG4-HG-III Infecting Buckwheat in China PreviousNext DISEASE NOTES OPENOpen Access licenseFirst Report of Rhizoctonia solani AG4-HG-III Infecting Buckwheat in ChinaH. Zhou, B. Dong, X. Zhang, Y. Liang, J. J. Hao, and L. H. WangH. ZhouSearch for more papers by this author, B. DongSearch for more papers by this author, X. ZhangSearch for more papers by this author, Y. LiangSearch for more papers by this author, J. J. HaoSearch for more papers by this author, and L. H. WangSearch for more papers by this authorAffiliationsAuthors and Affiliations H. Zhou B. Dong X. Zhang Y. Liang , College of Agronomy, Inner Mongolia Agricultural University, Hohhot 010019, China J. J. Hao , School of Food and Agriculture, University of Maine, Orono 04469 L. H. Wang , Institute of Biotechnology and Germplasm Resources, Academy of Agricultural Sciences, Yunnan, Kunming 65000, China. Published Online:29 Jun 2015https://doi.org/10.1094/PDIS-11-14-1156-PDNAboutSections ToolsAdd to favoritesDownload CitationsTrack Citations ShareShare onFacebookTwitterLinked InRedditEmailWechat In recent years, buckwheat (Fagopyrum esculentum Moench) has been threatened by a canker disease in the major buckwheat production region, Ku Lun County, Inner Mongolia of China. The symptom of canker started from light to dark brown lesion on the basal stem and roots. As the disease progressed, the lesion on the stem expanded and connected to form a patchy and irregular necrotic pattern, which moved further up and encircled the stem at the later stage. Severe disease caused the stem in the infected area to shrink. This resulted in reduced growth of plants and yellowing or dried leaves. Sclerotia were sometimes found on the infected roots. In a field survey in August 2013, more than 50% of buckwheat seedlings were infected in the field. In conducting Koch’s postulates, buckwheat stems with typical symptoms were collected and rinsed with tap water. The margin between healthy and diseased tissue was cut into 0.5-cm pieces, surface sterilized with 1% NaOCl for 5 min, and washed with sterile distilled water three times. The cut pieces were placed on potato dextrose agar (PDA) in a petri dish, and then incubated at 25 ± 1°C in the dark for 4 days. After the incubation, mycelial tips of the growing colonies were transferred to a new PDA plate for purification. Microscopic observation of the culture revealed that the hyphae branched at right angles, and the branching mycelium had a septum near the junction of the branching. Sclerotia were formed on PDA. The culture was identified as Rhizoctonia solani. The fungal isolates were further identified using molecular methods. Genomic DNA was extracted, and the internal transcribed spacer (ITS) region of ribosomal DNA was amplified using PCR with universal primers ITS1 and ITS4 (Kuramae et al. 2003). The PCR products were sequenced, and the sequences were analyzed using BLAST against the NCBI GenBank database. The sequences were 99% identical to R. solani AG4-HG-III isolate on GenBank (JQ669932). To examine the pathogenicity of the isolates, cultures of the isolates were incubated for 5 days on PDA plates (10 cm diameter) at 25°C in the dark, then mixed into a plastic pot (10 × 15 cm) containing autoclaved soil, with one plate of fungal culture per pot. Buckwheat seeds were sown in the pots, which were placed in an open space without other plants growing nearby. Noninfested soil was used for control. Each isolate was replicated 10 times (pots). Six days after emergence, the seedlings were removed and investigated for disease. The same symptoms were observed as described above. No symptoms were found on the control plants. Symptomatic tissues from the inoculated stems were sampled and the pathogen was reisolated for identification using PCR. The results confirmed that the pathogen was the same as the original inoculate (AG4-HG-III). The trial was repeated. Previous work has shown that Rhizoctonia sp. could infect buckwheat, but anastomosis groups were not identified (Morrall et al. 1972). In China, R. solani AG4-HG-III has been reported to infect cotton (Jing et al. 2012) and corn (Li et al. 2011), but, to our knowledge, this is the first report on buckwheat.References:Jing, Y., et al. 2012. Mycosytema 31:540. Google ScholarKuramae, E. K., et al. 2003. Eur. J. Plant Pathol. 109:391. https://doi.org/10.1023/A:1023591520981 Crossref, ISI, Google ScholarLi, J., et al. 2011. Mycosystema 30:392. Google ScholarMorrall, R. A. A., et al. 1972. Can. Plant Dis. Surv. 52:143. ISI, Google ScholarDetailsFiguresLiterature CitedRelated Vol. 99, No. 8 August 2015SubscribeISSN:0191-2917e-ISSN:1943-7692 Metrics Article History Issue Date: 6 Aug 2015Published: 29 Jun 2015First Look: 21 Jan 2015Accepted: 12 Jan 2015 Pages: 1187-1187 Information© 2015 The American Phytopathological SocietyCited byThanatephorus cucumeris (many names, depending on host)CABI Compendium, Vol. CABI CompendiumFirst Report of Rhizoctonia solani AG-4 HGI Causing Stem Canker on Fagopyrum tataricum (Tartary Buckwheat) in ChinaShijuan Li, Kaixuan Zhang, Muhammad Khurshid, Yu Fan, Bingliang Xu, and Meiliang Zhou4 December 2020 | Plant Disease, Vol. 105, No. 2" @default.
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• W2044515333 title "First Report of <i>Rhizoctonia solani</i> AG4-HG-III Infecting Buckwheat in China" @default.
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