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THE ULTRASTRUCTURE OF MITOSIS IN MYXAMOEBAE AND PLASMODIA OF PHYSARUM FLAVICOMUM
Author(s) -
Aldrich Henry C.
Publication year - 1969
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.1537-2197.1969.tb07536.x
Subject(s) - biology , physarum , mitosis , prophase , telophase , centriole , ultrastructure , microbiology and biotechnology , botany , meiosis , physarum polycephalum , genetics , gene
Electron microscopy of glutaraldehyde‐osmium‐fixed samples of haploid myxamoebae and diploid plasmodia of the myxomycete Physarum flavicomum Berk. reveal dissimilar spindle apparatus during mitosis in the two cell types. Myxamoebae exhibit an astral type of mitosis with centrioles at the poles and nuclear envelope breakdown during prophase. Plasmodial nuclei lack centrioles at mitosis and have an intranuclear spindle, with nuclear envelope persisting during the entire division. Coated vesicles are noted during prophase and telophase in myxamoebae and their role in spindle formation and dispersion is suggested.