Advanced

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:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physiologia Plantarum
volume
70
issue
3
pages
394 - 398
publisher
Wiley Online Library
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
2007-07-30 12:06:35
date last changed
2017-10-01 04:39:31
@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    = {Wiley Online Library},
  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},
  volume       = {70},
  year         = {1987},
}