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HELMINTHOSPORIUM|victoriae":
3 articles found in Index.
BRILLOVÁ D., SLADKÁ O. (1989): Transmission of virus-like particles from the infected into the healthy strains of Cercospora beticola Sacc. Česká Mykologie 43(3): 155-165 (published: 21st August, 1989)
abstract
The paper deals with the ultrastructure of the conidia of powdery mildew (Erysiphe graminis f. sp. hordei Marchal) using the freeze-etching technique. Cross fractures through whole conidia exposed the cell wall and faces of the plasma membrane bearing invaginations. In addition, structural details of the conidium internal organization were recognized. The nuclear membrane showed numerous pores scattered over the nuclear surface. Numerous mitochondria, small vesicles and glycogen accumulated along the conidium periphery. The results obtained with Erysiphe graminis conidia prove the advantages of the freeze-etching method over the conventional fixation procedures for fungal conidia.
BRILLOVÁ D., ŠUŤÁKOVÁ G. (1984): Viruslike particles in hyphae of parasitic fungus Cercospora beticola Sacc. Česká Mykologie 38(4): 193-196 (published: 15th November, 1984)
abstract
In the present paper we summarize the results of electron microscope investigation of the hyphae of three singlespore isolates of Cercospora beticola and a sterile mutant. In ultrathin sections of hyphal cells we have found two types of viruslike particles of spherical shape, 30—35 and 50—55 nm in diameter. They were dispersed in the cytoplasm and occasionally in the vacuoles as well. Viruslike particles of both types occurred together in the hyphal cells of the strain Mss2, whereas the hyphal cells of strain PR13 contained viruslike particles only one dimension, i.e. there were cells containing 30—35 nm and others 50—55 nm viruslike particles. In the infected cells we observed changes of mitochondria, the occurrence of lamellar structures, changes of cell walls leading to the disruption and liberation of viruslike particles from the cells. The sporulation of infected strains was considerably lower than in healthy one.
HEJTMÁNEK M., LENHART K. (1970): Contribution to faviform variability and pathogenicity of dermatophytes. Česká Mykologie 24(4): 192-197 (published: 29th October, 1970)
abstract
The faviform UV-mutants of Microsporum cookei, Trichophyton ajelloi and Trichophyton mentagrophytes are described. Two of the eight faviform mutants of T. mentagrophytes were pathogenic for guinea pigs, the others were non-pathogenic. The changed morphology of faviform mutants derived from T. mentagrophytes was permanent even after recultivation from animal lesion. The authors classify faviform changes known up to now into three categories: 1. Faviform modifications (reversible reaction of culture on specific environmental factors). 2. Faviform mutations (irreversible changes of cultures). 3. Syndrome of faviform senescence (spontaneous change in old cultures of dermatophytes probably caused by mutation in cytoplasmic or nuclear determinant).
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