Complexity of Gaeumannomyces species causing take-all root rot of St. Augustinegrass in Texas
| العنوان: | Complexity of Gaeumannomyces species causing take-all root rot of St. Augustinegrass in Texas |
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| المؤلفون: | Lin Yu, Matthew J Zidek, Young-Ki Jo, Michael Jochum |
| المصدر: | Mycologia. 113:599-611 |
| بيانات النشر: | Informa UK Limited, 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | biology, Gaeumannomyces, Physiology, Stenotaphrum, Symptom development, Cell Biology, General Medicine, Take-all, biology.organism_classification, Horticulture, Graminicola, Phylogenetics, Genetics, Root rot, Potato dextrose agar, Molecular Biology, Ecology, Evolution, Behavior and Systematics |
| الوصف: | Gaeumannomyces graminis var. graminis (Ggg) has been the etiological agent of take-all root rot (TARR) in St. Augustinegrass (Stenotaphrum secundatum) and root decline of the other warm-season turfgrasses. Seventy-five Ggg isolates were obtained from St. Augustinegrass in central and east Texas. Evaluation of colony morphologies on potato dextrose agar (PDA) within 2 wk and follow-up multilocus phylogenic analyses revealed three phenotypic groups associated with different Gaeumannomyces species: (i) G. floridanus, highly melanized with round colony formation; (ii) G. arxii, none to slightly melanized with round colony formation; and (iii) G. graminicola, highly melanized with irregular colony formation. Further examination with representative isolates from each group revealed that their phenotypic characterizations supported the distinctive genetic groups within Ggg associated with St. Augustinegrass TARR. Gaeumannomyces floridanus isolates grew faster at warmer temperature (30 C) than G. arxii or G. graminicola. Pathogenicity assays using rice seedlings indicated that G. floridanus was more aggressive in disease symptom development than G. arxii or G. graminicola. A multilocus phylogeny reconstruction supported that most of Gaeumannomyces isolates tested in this study were separated into three phylogenetically distinct groups: G. floridanus, G. arxii, and G. graminicola. The resolution of intravarietal complexities of causal fungi of TARR is important for proper diagnostics and management strategies for TARR in St. Augustinegrass and other root-decline diseases in warm-season turfgrasses. |
| تدمد: | 1557-2536 0027-5514 |
| DOI: | 10.1080/00275514.2021.1881735 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::44bb7fab824b2af946adf0c46a43eff9 https://doi.org/10.1080/00275514.2021.1881735 |
| رقم الانضمام: | edsair.doi...........44bb7fab824b2af946adf0c46a43eff9 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15572536 00275514 |
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| DOI: | 10.1080/00275514.2021.1881735 |