Photophobic stop-response in a dinoflagellate - modulation by preirridation
Ekelund, N G A and Björn, Lars Olof LU
(1987)
In Physiologia Plantarum
70(3).
p.394-398
- Abstract
- Gyrodinium dorsum Kofoid responds photophobically to flashes of blue light. The photophobic response consists of a cessation of movement (stop-response). Without background light and after a flash fluence above 10 J m-2, 75-85% of the cells show a stop-response, only only 50% of the cells show this response at 5 J m-2. With a flash fluence of 5 J m-2, background light of different wavelengths either increases (614 nm, 5.5-18.2 .mu.mol m-2 s-1) or decreases (700 nm, 18.4-36.0 .mu.mol m-2 s-1) the stop-response. Two hypotheses for the mechanism of the modulation by background light of the photophobic response are discussed: an effect of light on the balance of the photosynthetic system (PS I/PS II) or an effect on a phytochrome-like pigment... (More)
- Gyrodinium dorsum Kofoid responds photophobically to flashes of blue light. The photophobic response consists of a cessation of movement (stop-response). Without background light and after a flash fluence above 10 J m-2, 75-85% of the cells show a stop-response, only only 50% of the cells show this response at 5 J m-2. With a flash fluence of 5 J m-2, background light of different wavelengths either increases (614 nm, 5.5-18.2 .mu.mol m-2 s-1) or decreases (700 nm, 18.4-36.0 .mu.mol m-2 s-1) the stop-response. Two hypotheses for the mechanism of the modulation by background light of the photophobic response are discussed: an effect of light on the balance of the photosynthetic system (PS I/PS II) or an effect on a phytochrome-like pigment (Pr /Pfr). This study supports the idea that a phytochrome-like pigment works in combination with a blue light-absorbing pigment. It was also found that cells of Gyrodinium dorsum cultured in red light (39.8 .mu.mol m-2) had a higher absorption in the red region of the absorption spectra than those cultured in white light (92.7 .mu.mol m-2). (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/134560
- author
- Ekelund, N G A
and Björn, Lars Olof
LU
- organization
- publishing date
- 1987
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physiologia Plantarum
- volume
- 70
- issue
- 3
- pages
- 394 - 398
- publisher
- John Wiley & Sons Inc.
- external identifiers
-
- scopus:84989672614
- ISSN
- 0031-9317
- DOI
- 10.1111/j.1399-3054.1987.tb02834.x
- language
- English
- LU publication?
- yes
- id
- 6c4e34c2-8ccc-4f65-8d4f-f93e18db6674 (old id 134560)
- date added to LUP
- 2016-04-01 15:58:25
- date last changed
- 2021-01-03 09:58:59
@article{6c4e34c2-8ccc-4f65-8d4f-f93e18db6674,
abstract = {{Gyrodinium dorsum Kofoid responds photophobically to flashes of blue light. The photophobic response consists of a cessation of movement (stop-response). Without background light and after a flash fluence above 10 J m-2, 75-85% of the cells show a stop-response, only only 50% of the cells show this response at 5 J m-2. With a flash fluence of 5 J m-2, background light of different wavelengths either increases (614 nm, 5.5-18.2 .mu.mol m-2 s-1) or decreases (700 nm, 18.4-36.0 .mu.mol m-2 s-1) the stop-response. Two hypotheses for the mechanism of the modulation by background light of the photophobic response are discussed: an effect of light on the balance of the photosynthetic system (PS I/PS II) or an effect on a phytochrome-like pigment (Pr /Pfr). This study supports the idea that a phytochrome-like pigment works in combination with a blue light-absorbing pigment. It was also found that cells of Gyrodinium dorsum cultured in red light (39.8 .mu.mol m-2) had a higher absorption in the red region of the absorption spectra than those cultured in white light (92.7 .mu.mol m-2).}},
author = {{Ekelund, N G A and Björn, Lars Olof}},
issn = {{0031-9317}},
language = {{eng}},
number = {{3}},
pages = {{394--398}},
publisher = {{John Wiley & Sons Inc.}},
series = {{Physiologia Plantarum}},
title = {{Photophobic stop-response in a dinoflagellate - modulation by preirridation}},
url = {{http://dx.doi.org/10.1111/j.1399-3054.1987.tb02834.x}},
doi = {{10.1111/j.1399-3054.1987.tb02834.x}},
volume = {{70}},
year = {{1987}},
}