Summary
An electron microscope study has been done on the structure of microconidia and stroma of Sclerotinia sclerotiorum. The microconidia showed the usual cell organelles already described for other species of this genus, e.g. a large nucleus and large lipid body, a few mitochondria and sparse endoplasmic reticulum. The stromatal ultrastructure presented hyphae with a rich content in lipid bodies and storage vacuoles as food reserve. Simple septa with plugged pores were occasionally seen. Although the existence of two kinds of hyphae, one with abundant food materials and the other type with a degenerated aspect, both hyphae showed a similar thickness in their cell walls approximately 0.2 μ, and the diameter of these hyphae was 1.5–3 μ.
Similar content being viewed by others
References
Calonge, F. D.: Origin and development of intrahyphal hyphae in Sclerotinia fructigena. Mycologia (N.Y.) 60, 932–942 (1968).
—: The occurrence of glycogen-membrane complexes in fungi. An electron microscope study. Protoplasma (Wien) 67, 79–85 (1969a).
—: Ultrastructure of the haustoria or intracellular hyphae in four different fungi. Arch. Mikrobiol. 67, 209–225 (1969b).
—, Fielding, A. H., Byrde R. J. W.: Multivesicular bodies in, Sclerotinia fructigena and their possible relation to extracellular enzyme secretion. J. gen. Microbiol. 55, 177–184 (1969).
———, Akinrefon, O. A.: Changes in ultrastructure following fungal invasion and the possible relevance of extracellular enzymes. J. exp. Bot. 20, 350–357 (1969).
Drayton, F. L.: The sexual mechanism of Sclerotinia gladioli. Mycologia (N.Y.) 26, 46–72 (1934).
Gordee, R. S., Porter, C. L.: Structure, germination and physiology of microsclerotia of Verticillium albo-atrum. Mycologia (N.Y.) 53, 171–182 (1961).
Nadakavukaren, M. J.: Fine structure of microsclerotia of Verticillium albo-atrum Reinke et Berth. Canad. J. Microbiol. 9, 411–413 (1963).
Nair, N. G., White, N. H., Griffin, D. M., Blair, S.: Fine structure and electron cytochemical studies of Sclerotium Rolfsii Sacc. Aust. J. biol. Sci. 22, 639–652 (1969).
Willetts, H. J., Calonge, F. D.: Spore development in the brown rot fungi (Sclerotinia spp.). New Phytol. 68, 123–131 (1969a).
——: The ultrastructure of the stroma of the brown rot fungi. Arch. Mikrobiol. 64, 279–288 (1969b).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Calonge, F.D. Notes on the ultrastructure of the microconidium and stroma in Sclerotinia sclerotiorum . Archiv. Mikrobiol. 71, 191–195 (1970). https://doi.org/10.1007/BF00417741
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00417741