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PATHWAYS OF CELLULAR MORPHOGENESIS : A Diversity in Nitella

Evidence is presented to show that a given change in cell form or size may generally be brought about by a variety of patterns of local surface distortion and expansion. Structural and chemical features of the cell which are important in morphogenesis may thus be expected to relate not to form per s...

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Detalles Bibliográficos
Autor principal: Green, Paul B.
Formato: Texto
Lenguaje:English
Publicado: The Rockefeller University Press 1965
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2106723/
https://www.ncbi.nlm.nih.gov/pubmed/5884630
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author Green, Paul B.
author_facet Green, Paul B.
author_sort Green, Paul B.
collection PubMed
description Evidence is presented to show that a given change in cell form or size may generally be brought about by a variety of patterns of local surface distortion and expansion. Structural and chemical features of the cell which are important in morphogenesis may thus be expected to relate not to form per se but to the kinetics of surface behavior which establish form. These kinetics evaluate both the rate at which local regions of cell surface expand and the directed character (anisotropy) of this expansion. These variables have been studied in model systems and, through marking experiments, in growing cells of various shapes in Phycomyces, Clypeaster, and particularly Nitella. In the latter plant, prominent "giant internodes" display a well defined longitudinal anisotropic expansion devoid of sizeable gradients in expansion rate. These cells have their origin, however, in apical cells which have a pronounced gradient in area expansion rate (maximal at the tip). The great part of the expansion in the apical cell is apparently isotropic (equal in all directions), but the basal region often shows predominant expansion laterally. This transverse stretching in the apical cell could align cell wall texture and possibly fibrous cytoplasmic constituents, such as microtubules, into configurations significant in later morphogenetic stages, including the elongation of the internodes.
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spelling pubmed-21067232008-05-01 PATHWAYS OF CELLULAR MORPHOGENESIS : A Diversity in Nitella Green, Paul B. J Cell Biol Article Evidence is presented to show that a given change in cell form or size may generally be brought about by a variety of patterns of local surface distortion and expansion. Structural and chemical features of the cell which are important in morphogenesis may thus be expected to relate not to form per se but to the kinetics of surface behavior which establish form. These kinetics evaluate both the rate at which local regions of cell surface expand and the directed character (anisotropy) of this expansion. These variables have been studied in model systems and, through marking experiments, in growing cells of various shapes in Phycomyces, Clypeaster, and particularly Nitella. In the latter plant, prominent "giant internodes" display a well defined longitudinal anisotropic expansion devoid of sizeable gradients in expansion rate. These cells have their origin, however, in apical cells which have a pronounced gradient in area expansion rate (maximal at the tip). The great part of the expansion in the apical cell is apparently isotropic (equal in all directions), but the basal region often shows predominant expansion laterally. This transverse stretching in the apical cell could align cell wall texture and possibly fibrous cytoplasmic constituents, such as microtubules, into configurations significant in later morphogenetic stages, including the elongation of the internodes. The Rockefeller University Press 1965-11-01 /pmc/articles/PMC2106723/ /pubmed/5884630 Text en This article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see http://www.rupress.org/terms). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 4.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/4.0/).
spellingShingle Article
Green, Paul B.
PATHWAYS OF CELLULAR MORPHOGENESIS : A Diversity in Nitella
title PATHWAYS OF CELLULAR MORPHOGENESIS : A Diversity in Nitella
title_full PATHWAYS OF CELLULAR MORPHOGENESIS : A Diversity in Nitella
title_fullStr PATHWAYS OF CELLULAR MORPHOGENESIS : A Diversity in Nitella
title_full_unstemmed PATHWAYS OF CELLULAR MORPHOGENESIS : A Diversity in Nitella
title_short PATHWAYS OF CELLULAR MORPHOGENESIS : A Diversity in Nitella
title_sort pathways of cellular morphogenesis : a diversity in nitella
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2106723/
https://www.ncbi.nlm.nih.gov/pubmed/5884630
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