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A LIGHT‐ AND ELECTRON‐MICROSCOPIC STUDY OF PRIMARY HETEROGENEITY IN THE EGGS OF TWO BROWN ALGAE
Author(s) -
Neushul M.,
Liddle L.
Publication year - 1968
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.1537-2197.1968.tb07471.x
Subject(s) - biology , plastid , botany , vacuole , organelle , mucilage , microbiology and biotechnology , cytoplasm , chloroplast , biochemistry , gene
The mature eggs of Zonaria farlowii and Dictyota binghamiae exhibit a distinctively symmetrical arrangement of organelles. In mature oogonia plastids occur in two groups in the central region of the cell and vacuoles of several types are arranged in peripheral layers. Before the mature egg is released, an amorphous “mucilage layer” developes inside the wall of the oogonium. After fertilization the plastids become uniformly distributed. When the eggs of Zonaria develop parthenogenetically the primary heterogeneity is retained. The symmetrical arrangement of membranes seen in the oocytes of these plants may represent an organizing system that influences cytodifferentiation and perhaps subsequent embryology.