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EXPERIMENTAL MODIFICATION OF THE MORPHOGENETIC BEHAVIOR OF THE ISOLATED SUB‐APICAL CELL OF THE APEX OF SPHACELARIA CIRROSA (PHAEOPHYCEAE) 1
Author(s) -
Ducreux Georges
Publication year - 1984
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.0022-3646.1984.00447.x
Subject(s) - apical cell , biology , apex (geometry) , apical constriction , mitosis , microbiology and biotechnology , morphogenesis , tip growth , cell , nucleus , organelle , cell polarity , anatomy , genetics , botany , gene , pollen , pollination , pollen tube
ABSTRACT Experimental isolation of the terminal cells of the apex of Sphacelaria cirrosa (Roth) C. Agardh shows that the isolated apical cell retains a self‐maintained mode of functioning. The isolated sub‐apical cell, however, gives rise to a newly‐formed axis after undergoing a different type of developmental sequence. An experimental scheme allowing one to defer isolation of the sub‐apical cell after killing the apical cell shows that the maintenance, for a few hours only, of connections with subjacent cells is sufficient to induce an apical type mode of functioning in the sub‐apical cell. The sequential analysis of the first cytological events in this phenomenon allows one to relate this modification of the morphogenetic program to a functional and polarized arrangement of organelles within the cell reconstituting the apical. The morphogenetic program is characterized by a migration of the nucleus to a distal position prior to an asymmetrical mitosis characteristic of the apical mode of functioning.