{"title":"Control of <i>Rhizoctonia solani</i> on Cotton Seedlings with <i>Pseudomonas fluorescens</i> and With an Antibiotic Produced by the Bacterium.","authors":"C R Howell, R D Stipanovic","doi":"10.1094/Phyto-69-480","DOIUrl":null,"url":null,"abstract":"<p><p>A strain of <i>Pseudomonas fluorescens</i> antagonistic to <i>Rhizoctonia solani</i> was isolated from the rhizosphere of cotton seedlings. An antibiotic strongly inhibitory to <i>R. solani</i> was isolated from <i>P. fluorescens</i> cultures and identified as pyrrolnitrin (3-chloro-4-[2'-nitro-3'-chlorophenyl]-pyrrole). The antibiotic also inhibited growth of other fungi associated with the cotton seedling disease complex including: <i>Thielaviopsis basicola, Alternaria</i> sp., and <i>Verticillium dahliae.</i> A <i>Fusarium</i> sp. was only partially inhibited and <i>Pythium ultimum</i> was unaffected. Treating cottonseed with <i>P. fluorescens</i> or pyrrolnitrin at time of planting in <i>R. solani</i>-infested soil increased seedling survival from 30 to 79% and from 13 to 70%, respectively. Pyrrolnitrin persisted for up to 30 days in moist nonsterile soil with no measurable loss in activity.</p>","PeriodicalId":20410,"journal":{"name":"Phytopathology","volume":"102 1","pages":"480-482"},"PeriodicalIF":3.1000,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Phytopathology","FirstCategoryId":"97","ListUrlMain":"https://doi.org/10.1094/Phyto-69-480","RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"PLANT SCIENCES","Score":null,"Total":0}
引用次数: 0
Abstract
A strain of Pseudomonas fluorescens antagonistic to Rhizoctonia solani was isolated from the rhizosphere of cotton seedlings. An antibiotic strongly inhibitory to R. solani was isolated from P. fluorescens cultures and identified as pyrrolnitrin (3-chloro-4-[2'-nitro-3'-chlorophenyl]-pyrrole). The antibiotic also inhibited growth of other fungi associated with the cotton seedling disease complex including: Thielaviopsis basicola, Alternaria sp., and Verticillium dahliae. A Fusarium sp. was only partially inhibited and Pythium ultimum was unaffected. Treating cottonseed with P. fluorescens or pyrrolnitrin at time of planting in R. solani-infested soil increased seedling survival from 30 to 79% and from 13 to 70%, respectively. Pyrrolnitrin persisted for up to 30 days in moist nonsterile soil with no measurable loss in activity.
期刊介绍：
Phytopathology publishes articles on fundamental research that advances understanding of the nature of plant diseases, the agents that cause them, their spread, the losses they cause, and measures that can be used to control them. Phytopathology considers manuscripts covering all aspects of plant diseases including bacteriology, host-parasite biochemistry and cell biology, biological control, disease control and pest management, description of new pathogen species description of new pathogen species, ecology and population biology, epidemiology, disease etiology, host genetics and resistance, mycology, nematology, plant stress and abiotic disorders, postharvest pathology and mycotoxins, and virology. Papers dealing mainly with taxonomy, such as descriptions of new plant pathogen taxa are acceptable if they include plant disease research results such as pathogenicity, host range, etc. Taxonomic papers that focus on classification, identification, and nomenclature below the subspecies level may also be submitted to Phytopathology.
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