Victória Oasis Regis Lessa Matos, Athus Diego Azevedo Silva, André Luiz Firmino, Olinto Liparini Pereira
{"title":"First report of Colletotrichum orchidophilum causing necrotic spots on flowers of Laelia tenebrosa.","authors":"Victória Oasis Regis Lessa Matos, Athus Diego Azevedo Silva, André Luiz Firmino, Olinto Liparini Pereira","doi":"10.1007/s42770-025-01776-w","DOIUrl":null,"url":null,"abstract":"<p><p>Among the 2,692 orchid species endemic to Brazil, Laelia tenebrosa has significant economic value because of the beauty of its flowers and the size of the plant. Despite being listed as endangered, it is one of the most cultivated Laelia species. Anthracnose is one of the main diseases affecting orchids. The fungus responsible for the disease, Colletotrichum sp., can spread efficiently in orchid collections in Brazil owing to favorable temperature and humidity conditions. To date, 46 species of Colletotrichum have been identified as the causal agents of anthracnose in various orchid species worldwide. In December 2018, flowers of Laelia tenebrosa (Orchidaceae) with necrotic spots were collected from the orchidarium maintained at the coffee nursery of the Universidade Federal de Viçosa (UFV), State of Minas Gerais, Brazil. The fungus was identified based on morphological characteristics and phylogenetic analyses using Bayesian inference, and the maximum likelihood method was performed using sequences from each region (ACT, CHS, GAPDH, ITS, and TUB2) and concatenated sequences. The disease is caused by Colletotrichum orchidophilum, a species known to infect Bletilla striata in China, Cycnoches aureum in Panama, Dendrobium sp. in Thailand and the United States, Phalaenopsis sp. in the United Kingdom, x Ascocenda sp. in the United States, and Reunion Island as the causal agent of black spots on Vanilla planifolia. For the first time, C. orchidophilum was reported in Brazil and was the first to cause anthracnose in Laelia worldwide.</p>","PeriodicalId":9090,"journal":{"name":"Brazilian Journal of Microbiology","volume":" ","pages":""},"PeriodicalIF":1.9000,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Brazilian Journal of Microbiology","FirstCategoryId":"99","ListUrlMain":"https://doi.org/10.1007/s42770-025-01776-w","RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MICROBIOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
Among the 2,692 orchid species endemic to Brazil, Laelia tenebrosa has significant economic value because of the beauty of its flowers and the size of the plant. Despite being listed as endangered, it is one of the most cultivated Laelia species. Anthracnose is one of the main diseases affecting orchids. The fungus responsible for the disease, Colletotrichum sp., can spread efficiently in orchid collections in Brazil owing to favorable temperature and humidity conditions. To date, 46 species of Colletotrichum have been identified as the causal agents of anthracnose in various orchid species worldwide. In December 2018, flowers of Laelia tenebrosa (Orchidaceae) with necrotic spots were collected from the orchidarium maintained at the coffee nursery of the Universidade Federal de Viçosa (UFV), State of Minas Gerais, Brazil. The fungus was identified based on morphological characteristics and phylogenetic analyses using Bayesian inference, and the maximum likelihood method was performed using sequences from each region (ACT, CHS, GAPDH, ITS, and TUB2) and concatenated sequences. The disease is caused by Colletotrichum orchidophilum, a species known to infect Bletilla striata in China, Cycnoches aureum in Panama, Dendrobium sp. in Thailand and the United States, Phalaenopsis sp. in the United Kingdom, x Ascocenda sp. in the United States, and Reunion Island as the causal agent of black spots on Vanilla planifolia. For the first time, C. orchidophilum was reported in Brazil and was the first to cause anthracnose in Laelia worldwide.
期刊介绍:
The Brazilian Journal of Microbiology is an international peer reviewed journal that covers a wide-range of research on fundamental and applied aspects of microbiology.
The journal considers for publication original research articles, short communications, reviews, and letters to the editor, that may be submitted to the following sections: Biotechnology and Industrial Microbiology, Food Microbiology, Bacterial and Fungal Pathogenesis, Clinical Microbiology, Environmental Microbiology, Veterinary Microbiology, Fungal and Bacterial Physiology, Bacterial, Fungal and Virus Molecular Biology, Education in Microbiology. For more details on each section, please check out the instructions for authors.
The journal is the official publication of the Brazilian Society of Microbiology and currently publishes 4 issues per year.