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In April 2021, tan spot symptoms were observed in a commercial wheat field in Suncheon, Jeonnam Province, Korea, with over 5% of the wheat leaves exhibiting symptoms. These symptoms included oval-shaped tan necrosis surrounded by a bright halo. The three representative isolates exhibited irregular mycelial growth on V8-potato dextrose agar and produced pseudothecia. Based on the concatenated sequence datasets of four multi-genes, including the internal transcribed spacer, large subunit ribosomal RNA, glyceraldehyde3-phosphate dehydrogenase, and RNA polymerase II second-largest subunit genes, phylogenetic analysis revealed that these three isolates clustered in the same clade as P. tritici-repentis. Results of pathogenicity test indicated that the initial symptoms appeared 5 days post-inoculation (dpi), with typical tan spot symptoms developing at 7 dpi. The pathogen was successfully re-isolated from the symptomatic tissues, thus fulfilling Koch's postulates. Furthermore, we selected three fungicides that effectively inhibited the mycelial growth of P. tritici-repentis by more than 90% in vitro. To the best of our knowledge, this is the first report of tan spot disease in wheat in Korea.","absEn":"Tan spot, caused by Pyrenophora tritici-repentis, is a major foliar disease in wheat worldwide. In April 2021, tan spot symptoms were observed in a commercial wheat field in Suncheon, Jeonnam Province, Korea, with over 5% of the wheat leaves exhibiting symptoms. These symptoms included oval-shaped tan necrosis surrounded by a bright halo. The three representative isolates exhibited irregular mycelial growth on V8-potato dextrose agar and produced pseudothecia. Based on the concatenated sequence datasets of four multi-genes, including the internal transcribed spacer, large subunit ribosomal RNA, glyceraldehyde3-phosphate dehydrogenase, and RNA polymerase II second-largest subunit genes, phylogenetic analysis revealed that these three isolates clustered in the same clade as P. tritici-repentis. Results of pathogenicity test indicated that the initial symptoms appeared 5 days post-inoculation (dpi), with typical tan spot symptoms developing at 7 dpi. The pathogen was successfully re-isolated from the symptomatic tissues, thus fulfilling Koch's postulates. Furthermore, we selected three fungicides that effectively inhibited the mycelial growth of P. tritici-repentis by more than 90% in vitro. To the best of our knowledge, this is the first report of tan spot disease in wheat in Korea.","kwd":"Morphology, Phylogeny, Pyrenophora tritici-repentis, Triticum aestivum, Wheat","vol":"51","issue":"4","ctrlNo":"JRL2017-1741","journalTitle":"한국균학회지","projectId":null,"articleProjectList":[],"pubmedId":null,"journal":{"doi":"10.4489","aliasDoi":null,"conflicted":false,"contentType":"JOURNAL","contentGbNm":"저널","depositorId":"mycology","depositorName":"한국균학회","submissionId":null,"lhsRegState":null,"lhsRegDt":null,"insertDt":"20170630171830","lastUpdateDt":"20170630171830","deleteFlg":"N","deleteType":null,"memo":null,"deleteDt":null,"inProgressOfRemoving":false,"doiLocationList":null,"contributorList":null,"referenceList":null,"changeHistoryList":null,"doiAttachList":null,"relativeLinkList":null,"citingArticleList":null,"contentRemovingList":null,"relativeIdsList":null,"doiLocChangedYn":null,"registStatus":null,"status":null,"messageId":null,"message":null,"title":"한국균학회지","titleEn":"The Korean Journal of Mycology","pubYear":"1973","pubMonth":null,"pubDay":null,"publisherId":"GNHHDL","lang":"KO","pubCountry":"KR","conflictId":null,"ctrlNo":"JRL2017-1741","titleAbbr":null,"issnP":"0253-651X","issnE":"2383-5249","issnL":null,"pubName":"한국균학회","pubTerm":"M3-01","pubTermText":null,"url":"http://www.kjmycology.or.kr","preCtrlNo":null,"preTitle":"","volumeIssueCount":81,"articleCount":1034,"articleList":null,"volumeIssueList":null,"issn":"0253-651X","conflictDoiList":null,"secondDoiLocation":null,"contentGb":"01","firstDoiLocation":null},"conflictDoiList":null,"secondDoiLocation":null,"contentGb":"03","firstDoiLocation":{"doi":"10.4489/KJM.20230030","seqNo":1,"url":"https://www.kjmycology.or.kr/5104-03","insertDt":"20250517130901","lastUpdateDt":"20250517130901"}}