{"title":"The Relationship of Pathogenicity in <i>Pseudomonas solanacearum</i> to Colony Appearance on a Tetrazolium Medium.","authors":"Arthur Kelman","doi":"10.1094/Phyto-44-693","DOIUrl":null,"url":null,"abstract":"<p><p>Mutants of <i>Pseudomonas solanacearum</i> differing in colony morphology from the normal or wild type were detected readily when bacterial suspensions from stock cultures were streaked on a medium containing tetrazolium chloride and examined with obliquely transmitted light. The most common mutant formed a round, butyrous, deep red colony with a narrow bluish border. In contrast, the normal or wild type formed an irregularly-round, fluidal, white colony with a pink center. Inoculation tests on tomato seedlings demonstrated that colony appearance on the tetrazolium medium could be related to pathogenicity. Cultures derived from butyrous red colonies were either weakly pathogenic or non-pathogenic, whereas cultures from fluidal white colonies with pink centers were highly pathogenic.</p>","PeriodicalId":20410,"journal":{"name":"Phytopathology","volume":"115 8V","pages":"693-695"},"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-44-693","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}
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Abstract
Mutants of Pseudomonas solanacearum differing in colony morphology from the normal or wild type were detected readily when bacterial suspensions from stock cultures were streaked on a medium containing tetrazolium chloride and examined with obliquely transmitted light. The most common mutant formed a round, butyrous, deep red colony with a narrow bluish border. In contrast, the normal or wild type formed an irregularly-round, fluidal, white colony with a pink center. Inoculation tests on tomato seedlings demonstrated that colony appearance on the tetrazolium medium could be related to pathogenicity. Cultures derived from butyrous red colonies were either weakly pathogenic or non-pathogenic, whereas cultures from fluidal white colonies with pink centers were highly pathogenic.
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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