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ULTRASTRUCTURAL CHANGES DURING ZOOSPORE FORMATION IN PHYTOPHTHORA PARASITICA
Author(s) -
Hohl Hans R.,
Hamamoto Susan T.
Publication year - 1967
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1967.tb10743.x
Subject(s) - vesicle , biology , cytoplasm , vacuole , zoospore , ultrastructure , sporangium , biophysics , cleavage (geology) , hypha , multinucleate , microbiology and biotechnology , botany , spore , biochemistry , membrane , paleontology , fracture (geology)
Cleavage of the multinucleate sporangial cytoplasm begins by a rearrangement and subsequent fusion of randomly dispersed cleavage vesicles. The vesicles line up in planes equidistant from neighboring nuclei and along the sporangial wall. In addition, they contribute to the enlargement of the central vacuole. Fusion of these vesicles with themselves and with the central vacuole cleaves the cytoplasm into uninucleate zoospores, each with two flagella. The sporangial wall consists of two layers, an outer thin one which is continuous over the plug of the discharge pore and an inner thick one which tapers off near the plug. The plug consists of fibrillar material and is ejected upon release of the zoospores. A plug‐like structure separating the forming sporangium from the hypha has a homogeneous matrix pervaded with an anastomosing network of fine electron‐dense channels. In addition, glycogen‐like granules occur within mitochondria and paired structures are interpreted as procentrioles.