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Protoplasma : Volume 196

Chloroplast assemblage by mechanical stimulation and its intercellular transmission in diatom cells

Content Provider	Springer Nature Link
Author	Makita, N. Shihira Ishikawa, I.
Copyright Year	1997
Abstract	By touching a cell ofPleurosira laevis, a centric diatom, the chloroplasts in the cortical cytoplasm immediately migrate to the nuclear cytoplasm which is located at the center of the cell. The time required for migration, is about 10 s and that for restoration is about 15 min. The touch could be replaced by an electric stimulation. A 7 V pulse for 1 ms was required for the induction of chloroplast assemblage. To obtain chloroplast assemblage in 50% of the cells, the amount of time and voltage required were inversely proportional. Higher concentrations of KCl also induced chloroplast assemblage. Neither contact nor electric stimulation in Ca2+ free medium induced chloroplast assemblage. Verapamil, a Ca2+ channel blocker, in medium suppressed the chloroplast assemblage. Ca2+ ionophore caused the chloroplast assemblage. These results suggested that the depolarization of the plasma membrane was a trigger of the induction of chloroplast assemblage and the influx of Ca2+ to the cytoplasm through the channel was essential for this. The chloroplast assemblage was transmitted successively to the other cells of the filamentous colony, though these cells were linked only by a mucilaginous substance. Furthermore, the transmission occurred in cells which were placed separately. The maximum distance possible for this jumping transmission was 200 μm in the culture medium. To search for the release of any chemical transmitter, contact stimulation was applied to one cell at the middle of a filamentous colony which was placed in water streaming along the axis of the filament. Chloroplast assemblage was induced more in downstream cells than in upstream ones. This result suggested the existence of some substance which mediated the transmission of the stimulation.
Starting Page	86
Ending Page	95
Page Count	10
File Format	PDF
ISSN	0033183X
Journal	Protoplasma
Volume Number	197
Issue Number	1-2
e-ISSN	16156102
Language	English
Publisher	Springer-Verlag
Publisher Date	1997-01-01
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ca2+ Chloroplast assemblage Diatom cell Jumping transmission Mechanical stimulation Cell Biology Plant Sciences Zoology
Content Type	Text
Resource Type	Article
Subject	Cell Biology Plant Science Medicine

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