Salt effects on membranes of the Hypodermis and Mesophyll cells of Avicennia germinans (Avicenniaceae): A freeze-fracture study.

Freeze-fracture electron microscopy was used to investigate intramembranous particle (IMP) densities and particle dis- tributions in the plasma membrane and tonoplast of the cells of secreting and nonsecreting leaves of Avicennia germinans (L.) Steam. Intramembranous particle densities of the protoplasmic (P) and exoplasmic (E) face of the plasma membrane and tonoplast were significantly higher in hypodermal cells of secreting leaves than of nonsecreting leaves. In contrast, no significant differences in the frequency of intramembranous particles were found in any membrane faces of secreting or nonsecreting mesophyll cells. However, particle densities were higher in the plasma membrane and tonoplast of the mesophyll cells, compared to the hypodermal cells, with the exception of the P-face of hypodermal plasma membranes of secreting tissue, which had the highest particle density measured. Particle distributions were dispersed and no discernible patterns such as paracrystalline arrays or other multi-IMP structures were observed. Results support the hypothesis that secretion is coupled to changes in membrane ultrastructure, and the possibility that salt secretion is an active process driven by integral membrane proteins such as the H+/ATPase. Additionally, the hypodermal cells of the leaf may function as storage reservoirs for salt as well as water, suggesting a regulatory role in salt secretion.

Main Author: Balsamo, Ronald.
Other Authors: Thomson, William.
Format: Villanova Faculty Authorship
Language: English
Published: 1995
Online Access: http://ezproxy.villanova.edu/login?url=https://digital.library.villanova.edu/Item/vudl:173982
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dc_source_str_mv American Journal of Botany 82(4), 1995, 435-440.
author Balsamo, Ronald.
author_facet_str_mv Balsamo, Ronald.
Thomson, William.
author_or_contributor_facet_str_mv Balsamo, Ronald.
Thomson, William.
author_s Balsamo, Ronald.
spellingShingle Balsamo, Ronald.
Salt effects on membranes of the Hypodermis and Mesophyll cells of Avicennia germinans (Avicenniaceae): A freeze-fracture study.
author-letter Balsamo, Ronald.
author_sort_str Balsamo, Ronald.
author2 Thomson, William.
author2Str Thomson, William.
dc_title_str Salt effects on membranes of the Hypodermis and Mesophyll cells of Avicennia germinans (Avicenniaceae): A freeze-fracture study.
title Salt effects on membranes of the Hypodermis and Mesophyll cells of Avicennia germinans (Avicenniaceae): A freeze-fracture study.
title_short Salt effects on membranes of the Hypodermis and Mesophyll cells of Avicennia germinans (Avicenniaceae): A freeze-fracture study.
title_full Salt effects on membranes of the Hypodermis and Mesophyll cells of Avicennia germinans (Avicenniaceae): A freeze-fracture study.
title_fullStr Salt effects on membranes of the Hypodermis and Mesophyll cells of Avicennia germinans (Avicenniaceae): A freeze-fracture study.
title_full_unstemmed Salt effects on membranes of the Hypodermis and Mesophyll cells of Avicennia germinans (Avicenniaceae): A freeze-fracture study.
collection_title_sort_str salt effects on membranes of the hypodermis and mesophyll cells of avicennia germinans (avicenniaceae): a freeze-fracture study.
title_sort salt effects on membranes of the hypodermis and mesophyll cells of avicennia germinans (avicenniaceae): a freeze-fracture study.
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description Freeze-fracture electron microscopy was used to investigate intramembranous particle (IMP) densities and particle dis- tributions in the plasma membrane and tonoplast of the cells of secreting and nonsecreting leaves of Avicennia germinans (L.) Steam. Intramembranous particle densities of the protoplasmic (P) and exoplasmic (E) face of the plasma membrane and tonoplast were significantly higher in hypodermal cells of secreting leaves than of nonsecreting leaves. In contrast, no significant differences in the frequency of intramembranous particles were found in any membrane faces of secreting or nonsecreting mesophyll cells. However, particle densities were higher in the plasma membrane and tonoplast of the mesophyll cells, compared to the hypodermal cells, with the exception of the P-face of hypodermal plasma membranes of secreting tissue, which had the highest particle density measured. Particle distributions were dispersed and no discernible patterns such as paracrystalline arrays or other multi-IMP structures were observed. Results support the hypothesis that secretion is coupled to changes in membrane ultrastructure, and the possibility that salt secretion is an active process driven by integral membrane proteins such as the H+/ATPase. Additionally, the hypodermal cells of the leaf may function as storage reservoirs for salt as well as water, suggesting a regulatory role in salt secretion.
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fgs.label Salt effects on membranes of the Hypodermis and Mesophyll cells of Avicennia germinans (Avicenniaceae): A freeze-fracture study.
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dc.title Salt effects on membranes of the Hypodermis and Mesophyll cells of Avicennia germinans (Avicenniaceae): A freeze-fracture study.
dc.creator Balsamo, Ronald.
Thomson, William.
dc.description Freeze-fracture electron microscopy was used to investigate intramembranous particle (IMP) densities and particle dis- tributions in the plasma membrane and tonoplast of the cells of secreting and nonsecreting leaves of Avicennia germinans (L.) Steam. Intramembranous particle densities of the protoplasmic (P) and exoplasmic (E) face of the plasma membrane and tonoplast were significantly higher in hypodermal cells of secreting leaves than of nonsecreting leaves. In contrast, no significant differences in the frequency of intramembranous particles were found in any membrane faces of secreting or nonsecreting mesophyll cells. However, particle densities were higher in the plasma membrane and tonoplast of the mesophyll cells, compared to the hypodermal cells, with the exception of the P-face of hypodermal plasma membranes of secreting tissue, which had the highest particle density measured. Particle distributions were dispersed and no discernible patterns such as paracrystalline arrays or other multi-IMP structures were observed. Results support the hypothesis that secretion is coupled to changes in membrane ultrastructure, and the possibility that salt secretion is an active process driven by integral membrane proteins such as the H+/ATPase. Additionally, the hypodermal cells of the leaf may function as storage reservoirs for salt as well as water, suggesting a regulatory role in salt secretion.
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