The Nomenclature and Classification of the Actinomycetes

Waksman, Selman A.; Henrici, Arthur T.

doi:10.1128/jb.46.4.337-341.1943

Cited by 526 publications

(130 citation statements)

References 6 publications

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“…Ultrastructural analysis of Dermatophilus pro-vides valuable clues to its taxonomic status. The germination of coccoid forms to produce fine, branching hyphae places this organism among the Actinomycetales, group B of Waksman and Henrici (1943). Austwick (1958) proposed a new family, Dermatophilaceae, to be related to BI Actinomycetaceae, the fragmenting actinomy- Thin sections of Dermatophilus congolensis.…”

Section: Discussionmentioning

confidence: 99%

MICROMORPHOLOGY OF DERMATOPHILUS CONGOLENSIS

Gordon

Edwards

1963

J Bacteriol

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Gordon, Morris A. (Division of Laboratories and Research, New York State Department of Health, Albany), and Mercedes R. Edwards . Micromorphology of Dermatophilus congolensis . J. Bacteriol. 86: 1101–1115. 1963.—As seen in electron micrographs of thin sections, Dermatophilus congolensis is a holocarpic actinomycete that fragments, after formation of septa in several planes, into Sarcina -like packets and then into individual cocci. Release of coccal forms from the filaments and packets is by dissolution of a capsular matrix, which is a product of degradation of the cell wall. The plasmalemma is a “unit membrane.” Regularly occurring plasmalemmosomes (“onion bodies”) of uniform structure are apparently related to septum formation. A typical bacterial nucleoid is seen in most sections, and ribosomes are scattered throughout the cytoplasm. Specimens for electron microscopy were prepared by a modification of Kellenberger's method.

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Section: Discussionmentioning

confidence: 99%

MICROMORPHOLOGY OF DERMATOPHILUS CONGOLENSIS

Gordon

Edwards

1963

J Bacteriol

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“…The morphological characteristics of strain HAAG3-15 showed that it belonged to the genus Streptomyces [71]. The strain formed well-developed, branched substrate hyphae and aerial mycelium that differentiated into straight or flexuous spore chains consisting of cylindrical spores (0.55-0.81 µm × 0.75-1.22 µm), and the spore surface was rough ( Figure 6) after cultivation for three weeks.…”

Section: Characterization and Identification Of The Isolate Haag3-15mentioning

confidence: 99%

Community Structures and Antifungal Activity of Root-Associated Endophytic Actinobacteria in Healthy and Diseased Cucumber Plants and Streptomyces sp. HAAG3-15 as a Promising Biocontrol Agent

Wang

et al. 2020

Microorganisms

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Microorganisms related to plant roots are vital for plant growth and health and considered to be the second genome of the plant. When the plant is attacked by plant pathogens, the diversity and community structure of plant-associated microbes might be changed. The goal of this study is to characterize differences in root-associated endophytic actinobacterial community composition and antifungal activity between Fusarium wilt diseased and healthy cucumber and screen actinobacteria for potential biological control of Fusarium wilt of cucumber. In the present research, three healthy plants (also termed “islands”) and three obviously diseased plants (naturally infected by F. oxysporum f. sp. cucumerinum) nearby the islands collected from the cucumber continuous cropping greenhouse were chosen as samples. Results of culture-independent and culture-dependent analysis demonstrated that actinomycetes in the healthy roots were significantly more abundant than those of diseased roots. Moreover, there were seven strains with antifungal activity against F. oxysporum f. sp. cucumerinum in healthy cucumber roots, but only one strain in diseased cucumber roots. Out of these eight strains, the isolate HAAG3-15 was found to be best as it had the strongest antifungal activity against F. oxysporum f. sp. cucumerinum, and also exhibited broad-spectrum antifungal activity. Thus, strain HAAG3-15 was selected for studying its biocontrol efficacy under greenhouse conditions. The results suggested that the disease incidence and disease severity indices of cucumber Fusarium wilt greatly decreased (p < 0.05) while the height and shoot fresh weight of cucumber significantly increased (p < 0.05) after inoculating strain HAAG3-15. On the basis of morphological characteristics, physiological and biochemical properties and 100% 16S ribosomal RNA (rRNA) gene sequence similarity with Streptomyces sporoclivatus NBRC 100767T, the isolate was assigned to the genus Streptomyces. Moreover, azalomycin B was isolated and identified as the bioactive compound of strain HAAG3-15 based on analysis of spectra using a bioactivity-guided method. The stronger antifungal activity against F. oxysporum f. sp. cucumerinum, the obvious effect on disease prevention and growth promotion on cucumber seedlings in the greenhouse assay, and the excellent broad-spectrum antifungal activities suggest that strain HAAG3-15 could be developed as a potential biocontrol agent against F. oxysporum f. sp. cucumerinum used in organic agriculture. These results suggested that the healthy root nearby the infected plant is a good source for isolating biocontrol and plant growth-promoting endophytes.

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“…Auf diese vorstehend zitierten Ergebnisse gebt die heutige allgemeine Ansidit zuriick, dali zahlreidie Acrinoniyceten als Erreger des Kartoffelsdiorfes zu betradiien sind. Sie wird von WAKSMAN (1950) Den Untersuchungen friiherer Autoren h.iften cine Reihe von Mangehi an, die berechtigte Zweifel an manchen Resultaten aufkommcn lassen. Die Isol ierung eines Strahlenpilzes aus schorfkrankem Kartoffelgewebe geniigt nicht, um ihn als Erreger dieser Krankheit ansehen zu konnen.…”

Section: Allgemeiner Teilunclassified

Untersuchungen zur Ätiologie pflanzlicher Actinomykosen

Hoffmann¹

1959

Journal of Phytopathology

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The Nomenclature and Classification of the Actinomycetes

Cited by 526 publications

References 6 publications

MICROMORPHOLOGY OF DERMATOPHILUS CONGOLENSIS

MICROMORPHOLOGY OF DERMATOPHILUS CONGOLENSIS

Community Structures and Antifungal Activity of Root-Associated Endophytic Actinobacteria in Healthy and Diseased Cucumber Plants and Streptomyces sp. HAAG3-15 as a Promising Biocontrol Agent

Untersuchungen zur Ätiologie pflanzlicher Actinomykosen

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