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אסיף מאגר המחקר החקלאי
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Alkalinity-induced aggregation in Chlorella vulgaris I. Changes in cell volume and cell-wall structure
Year:
1980
Source of publication :
Plant and Cell Physiology
Authors :
Ben-Arie, Ruth
;
.
Volume :
21
Co-Authors:

Shoshana Malis-Arad, Michael Friedlander, Amos E. Richmond

Facilitators :
From page:
27
To page:
35
(
Total pages:
9
)
Abstract:

In Chlorella vulgaris cell aggregation, the clustering of single cells into groups is induced by an alkaline pH (9.5). The process of alkalinity-induced aggregation may be divided into two stages: the first stage (0–24 hr after exposure to the alkaline pH) is characterized by enhanced precipitation of cells from the medium, as well as by a seven fold increase in cell volume. The second stage (24–120 hr) is associated with a further increase in the extent of cell precipitation in the culture, which seems to result from the aggregation of clusters of enlarged cells. Electron micrographs reveal the existence, at this phase, of a number of autospores in the cells within a modified multi-layered mother cell wall. The pectin content of cells at this stage is twice that of control cells grown at pH 6.3. In addition, the relative content of the different pectin fractions is modified as a result of the exposure to alkalinity. It is suggested that the aggregates result from the repeated failure of the cells to detach from their original mother cell walls, thus forming clusters which represent several generations of cells.

Note:
Related Files :
algal biomass
autospores
cell aggregation
cell wall
Chlorella
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More details
DOI :
https://doi.org/10.1093/oxfordjournals.pcp.a075987
Article number:
0
Affiliations:
Database:
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
54620
Last updated date:
02/03/2022 17:27
Creation date:
21/04/2021 12:30
Scientific Publication
Alkalinity-induced aggregation in Chlorella vulgaris I. Changes in cell volume and cell-wall structure
21

Shoshana Malis-Arad, Michael Friedlander, Amos E. Richmond

Alkalinity-induced aggregation in Chlorella vulgaris I. Changes in cell volume and cell-wall structure

In Chlorella vulgaris cell aggregation, the clustering of single cells into groups is induced by an alkaline pH (9.5). The process of alkalinity-induced aggregation may be divided into two stages: the first stage (0–24 hr after exposure to the alkaline pH) is characterized by enhanced precipitation of cells from the medium, as well as by a seven fold increase in cell volume. The second stage (24–120 hr) is associated with a further increase in the extent of cell precipitation in the culture, which seems to result from the aggregation of clusters of enlarged cells. Electron micrographs reveal the existence, at this phase, of a number of autospores in the cells within a modified multi-layered mother cell wall. The pectin content of cells at this stage is twice that of control cells grown at pH 6.3. In addition, the relative content of the different pectin fractions is modified as a result of the exposure to alkalinity. It is suggested that the aggregates result from the repeated failure of the cells to detach from their original mother cell walls, thus forming clusters which represent several generations of cells.

Scientific Publication
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