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A MORPHOMETRIC STUDY OF THE ULTRASTRUCTURE OF ECHINOCEREUS ENGELMANNII (CACTACEAE). VI. THE INDIVIDUALIZED ULTRASTRUCTURES OF DIVERSE TYPES OF MERISTEMS
Author(s) -
Mauseth James D.
Publication year - 1982
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.1537-2197.1982.tb13401.x
Subject(s) - biology , meristem , primordium , ultrastructure , cytokinesis , organelle , botany , mitosis , microbiology and biotechnology , anatomy , cell division , shoot , cell , genetics , gene
The structures of spine basal meristem cells were examined by stereological morphometric techniques and found to be different not only from shoot apical meristem cells but also from spine primordium cells in the relative volumes occupied by cellular organelles. Nineteen types of meristematic cells have been studied in E. engelmannii , and all are distinct ultrastructurally. This suggests that whereas they all appear to be primarily involved in mitosis and cytokinesis, there must be other important aspects to their physiology; possibly these cells have already begun differentiation toward their mature states even while they are parts of active meristems.