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• W2896701418 abstract "HomePlant DiseaseVol. 103, No. 3First Report of Basal Stem Rot of Wheat Caused by Microdochium majus in China PreviousNext DISEASE NOTES OPENOpen Access licenseFirst Report of Basal Stem Rot of Wheat Caused by Microdochium majus in ChinaJ. Tai, L. X. Zhang, G. J. Tan, and G. S. XuJ. TaiCollege of Plant Protection, Anhui Agricultural University, Hefei, 230036, China; and Search for more papers by this author, L. X. Zhanghttp://orcid.org/0000-0002-2163-7655College of Plant Protection, Anhui Agricultural University, Hefei, 230036, China; and Search for more papers by this author, G. J. Tan†Corresponding author: G. J. Tan; E-mail: E-mail Address: tgj63@163.comhttp://orcid.org/0000-0001-6223-7191College of Plant Protection, Anhui Agricultural University, Hefei, 230036, China; and Search for more papers by this author, and G. S. XuPlant Protection Station of Maanshan City, Maanshan, 243000, ChinaSearch for more papers by this authorAffiliationsAuthors and Affiliations J. Tai1 L. X. Zhang1 G. J. Tan1 † G. S. Xu2 1College of Plant Protection, Anhui Agricultural University, Hefei, 230036, China; and 2Plant Protection Station of Maanshan City, Maanshan, 243000, China Published Online:24 Jan 2019https://doi.org/10.1094/PDIS-07-18-1194-PDNAboutSectionsSupplemental ToolsAdd to favoritesDownload CitationsTrack Citations ShareShare onFacebookTwitterLinked InRedditEmailWechat In the summer of 2017, a serious basal stem rot disease of wheat (Triticum aestivum L.) was observed in commercial fields in Maanshan of Anhui Province, China. More than 60% of wheat plants (cv. Ningmai 13) were severely affected. Symptoms included leaf chlorosis and wilt. A dark brown lesion lined by a water-soaked area was noticeable at the stem base. On some of the damaged parts, red conidiomata and white mycelium were also visible. Small pieces were excised from symptomatic stems, and they were surface disinfected with 75% ethanol for 1 min and then for 1 min in 1% NaOCl, rinsed three times in sterile distilled water, dried on sterile paper, and placed onto potato dextrose agar (PDA) plates. A fungus isolated from infected tissue formed light-pink colonies and produced salmon-colored pionnotes on PDA. Conidiophores were short, straight, stick-like, and with no septation, ranging from 5 to 11 × 3 to 5 μm. Conidia were usually wide, sickle-shaped with one to three septa, and ranged from 16 to 31 × 3.5 to 5 μm. Pathogenicity tests were performed on healthy wheat plants (cv. Ningmai 13) by inoculation with six representative isolates (A1, D1, E3, F3, H1, and M1) in the experimental fields under natural conditions (20 to 30°C). Wheat stems were cleaned, surface disinfested with 1% NaOCl, and wounded with a sterilized needle. Mycelial plugs (7 mm in diameter) from 7-day-old cultures on PDA were placed over wounds and wrapped with Parafilm. Five wheat plants for each isolate were used. Control plants were similarly wounded and plugs of sterile PDA applied. A positive reaction consisting of necrosis in all inoculation points was observed within 7 days, and the symptomatic zone enlarged within 2 weeks. No symptoms were observed on the control plants. The fungus was reisolated from the infected tissues, fulfilling Koch’s postulates. To confirm identification of the pathogen, genomic DNA was extracted from mycelia of the six representative isolates. The internal transcribed spacer (ITS) region of rDNA (ITS1-5.8S-ITS4) and translation elongation factor 1-alpha (EF1-α) gene region were amplified by polymerase chain reaction (PCR) assays with primers ITS1/ITS4 (White et al. 1990) and EFMspF/EFMspR (Glynn et al. 2005), respectively. BLAST analysis showed that ITS (GenBank accession nos. MG891793 to MG891798) and EF1-α (GenBank accession nos. MH594230 to MH594235) sequences of the six isolates shared 99 and 100% sequence identity to those of Microdochium majus KP859001 and JX280526, respectively. In addition, the fungus was also confirmed to belong to M. majus by PCR with species-specific primers EFMajF/EFMicR (Glynn et al. 2005). Based on morphological and cultural characteristics, molecular data, and pathogenicity tests, this fungus was identified as M. majus. Previously, M. majus has been reported as the causal agent of wheat seedling blight in Denmark (Nielsen et al. 2013), and to our knowledge, this is the first report of basal stem rot of wheat caused by M. majus in China. Wheat crops where M. majus was identified are often rotated with oilseed rapes, which is not a host of M. majus (Vogelgsang et al. 2013). Therefore, the crop rotation with oilseed rapes could be an effective way for developing control strategies of this disease.References:Glynn, N. C., et al. 2005. Mycol. Res. 109:872. https://doi.org/10.1017/S0953756205003370 Crossref, ISI, Google ScholarNielsen, L. K., et al. 2013. Crop Prot. 43:192. https://doi.org/10.1016/j.cropro.2012.09.002 Crossref, ISI, Google ScholarVogelgsang, S., et al. 2013. Plant Pathol. 62:1020. https://doi.org/10.1111/ppa.12024 Crossref, ISI, Google ScholarWhite, T. J., et al. 1990. Page 315 in: PCR Protocols: A Guide to Methods and Applications. Academic Press, San Diego, CA. Crossref, Google ScholarFunding: Funding was provided by the Key Project of Science and Technology in Anhui Province (grant no. 17030701050).DetailsFiguresLiterature CitedRelated Vol. 103, No. 3 March 2019SubscribeISSN:0191-2917e-ISSN:1943-7692 Metrics Article History Issue Date: 6 Mar 2019Published: 24 Jan 2019First Look: 17 Oct 2018Accepted: 11 Oct 2018 Pages: 587-587 Information© 2019 The American Phytopathological SocietyFundingKey Project of Science and Technology in Anhui ProvinceGrant/Award Number: 17030701050Cited byFirst Report of Microdochium nivale and M. majus Causing Brown Foot Rot of Wheat in ChinaF. Xu, R. J. Shi, J. J. Zhang, Y. L. Song, L. L. Liu, Z. H. Han, J. M. Wang, Y. H. Li, C. H. Feng, and L. J. Li7 April 2022 | Plant Disease, Vol. 106, No. 5Diversity of Physiological and Biochemical Characters of Microdochium Fungi8 July 2020 | Chemistry & Biodiversity, Vol. 17, No. 8Evidence of Microdochium Fungi Associated with Cereal Grains in Russia28 February 2020 | Microorganisms, Vol. 8, No. 3" @default.
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• W2896701418 title "First Report of Basal Stem Rot of Wheat Caused by Microdochium majus in China" @default.
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