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Electron microscope observations of Ceratocystis ulmi‐induced tylosis development in Ulmus 1
Author(s) -
MacDonald W. L.,
McNabb H. S.
Publication year - 1974
Publication title -
european journal of forest pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.535
H-Index - 49
eISSN - 1439-0329
pISSN - 0300-1237
DOI - 10.1111/j.1439-0329.1974.tb00406.x
Subject(s) - biology , parenchyma , ceratocystis , botany , conidium , inoculation , electron microscope , protoplast , fungus , horticulture , physics , optics
Electron microscope observations of Ceratocystis ulmi ‐induced tylosis development in 3 species of elm were made during the first 2 weeks after artificial inoculation. Tylosis forming from both ray and vasicentric parenchyma occluded vessels adjacent to those containing the fungus conidia within one day after inoculation. The expanding protoplast forced the intact vessel‐parenchyma “pit membrane” and protective layer through the pit into the vessel lumen. Cell organization during this expansion is discussed. The observations on tylosis development for the 3 elms used were identical.