Biomedical subjects
Publications and source records attributed to J A Traquair.
4-Methyl-7,11-heptadecadienal [1] and 4-methyl-7,11-heptadecadienoic acid [2] were isolated as new compounds from liquid cultures of Sporothrix flocculosa and Sporothrix rugulosa. Compounds 1 and 2 inhibited the growth of Fusarium oxysporum f. sp. lycospersici, Trichoderma viride, and Bacillus subtilis.
The septal complex in hyphae of Hirshioporus pargamenus (Fr.) Bond. & Sing. is generally similar to that described for other Homobasidiomycetes. A noteworthy distinction is the presence of imperforate parenthesomes. A dark line is frequently observed in the inner matrix of the parenthesome. We suggest that this line is an image produced by the overlapping of folded, opposing membranes differentiated from the wall endoplasmic reticulum.
Necortrophic mycoparasitism by Hirschioporus parganenus (Fr.) Bond. & Sing. on selected non-basidiomycetous fungi is characterized by rapid necrosis of host cytoplasm. Invagination of the host plasmalemma is followed by the production of a conspicuous extraplasmalemmal wall deposit. Necrosis is the result of disruption of membrane systems and is followed by the penetration of dead host cells. Pathogenesis involves an unidentified toxic substance excreted by the parasite. Contact is not essential.
The antagonistic activity of Trametes hispida Bagl. in dual culture with Hirschioporus species and other non-basidiomycetous fungi is interpreted as hyphal interference. Hyphae of T. hispida grow into and over colonies of sensitive fungi. Contact with hyphae of T. hispida results in cessation of growth and rapid necrosis of affected cells. Ultrastructural studies of the affected hyphae of Hirschioporus pargamenus (Fr.) Bond. & Sing. showed an early formation of extraplasmalemmal wall deposits, disruption of membrane systems, coagulation of cytoplasm, localized dissolution of walls, and loss of cell contents without penetration by the antagonist.