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CRUCIFORM NUCLEAR DIVISION IN WORONINA PYTHII (PLASMODIOPHOROMYCETES)
Author(s) -
Dylewski Daniel P.,
Miller Charles E.
Publication year - 1983
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.1537-2197.1983.tb07923.x
Subject(s) - biology , telophase , mitosis , cruciform , lamin , metaphase , nucleolus , nucleus , chromatin , cell division , microbiology and biotechnology , nuclear membrane , nuclear lamina , inner membrane , genetics , nuclear protein , chromosome , dna , cell , history , archaeology , gene , transcription factor , mitochondrion
Somatic nuclear divisions in sporangiogenous plasmodia of Woronina pythii Goldie‐Smith were studied with transmission electron microscopy. During metaphase, each nucleus formed a cruciform configuration as chromatin became aligned at the equatorial plate perpendicular to the persistent nucleolus. Except for polar fenestrations, the original nuclear envelope remained intact throughout the mitotic division. Intranuclear membranous vesicles appeared to bleb off the inner membrane of the original nuclear envelope, adhered to the surfaces of the separating chromatin, and eventually formed new daughter nuclear envelope within the original nuclear envelope. During the first 24 hr of vegetative plasmodial growth, each telophase nucleus exhibited an obvious constriction of the original nuclear envelope in the interzonal region. Similar constrictions were not evident in telophase nuclei found in 24–36‐hr‐old plasmodia. This variation in the ultrastructural morphology of cruciform division appears to be related to the age and size of each sporangiogenous plasmodium, and is the first to be documented within this group of fungal pathogens.