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Scanning Electron Microscopy of Apothecia of Sclerotinia trifoliorum Erikss. and Related Species
Author(s) -
Arseniuk E.,
Macewicz J.
Publication year - 1994
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/j.1439-0434.1994.tb01470.x
Subject(s) - ascocarp , sclerotinia sclerotiorum , biology , sclerotium , botany , interspecific competition , taxonomy (biology)
The technique of scanning electron microscopy (SEM) was used to study the microanatomy of apothecia of Sclerotinia trifoliorum Erikss., S. sclerotiorum (Lib.) de Bary, and S. minor Jag., In the sterile tissue zones of apothecia, the only interspecific difference detected was that one in the structure of the apothecial margin of small‐ and large‐sclerotium Sclerotinia spp., The ectal excipulum, at the apothecial margin in S. minor appeared to be comprised of textura globulosa with globose cells. Whereas, in S. trifoliorum and S. sclerotiorum it appeared to be comprised of textura porrecta with prosenchymatous cells. The other interspecific difference reported in this paper is a dimorphism in spore size (ratio 4:4) in asci of S. trifoliorum. Otherwise, the microanatomy of ascocarps of S. trifoliorum and S. sclerotiorum was identical to that one of S. minor. Differences in the density of hyphae in the medullary excipulum in the apothecial disks of the three species studied were not detected. The presence of a membranous film over the hymenium of the ascocarp of S. trifoliorum or, any other species, as well as the bundlelike structure of the apothecial stipes in the studied species, as described in earlier reports, was also not found.