PMID: 6409048Jan 1, 1983Paper

Effects of sodium azide on phototaxis of the blue-green alga Anabaena variabilis and consequences to the two-photoreceptor systems-hypothesis

Archives of Microbiology
W NultschF Koenig

Abstract

Experiments with sodium azide support the earlier report that two different photoreceptor systems participate in the absorption of the phototactically active light in Anabaena variabilis. The one of them, represented by the phycobiliproteins and chlorophyll a, is responsible for positive and negative phototaxis around 440 nm and between 580 and 700 nm. This system is sensitive to sodium azide which is able to reverse the negative reaction at high fluence rates to a positive one. The second one which absorbs light between 500 and 560 nm and above 700 nm is insensitive to azide. It triggers only negative responses in absence and presence of azide as well. P750 is obviously not a photoreceptor pigment of this system, since there is no indication for its occurrence in Anabaena. Even photobleaching of the photosynthetic pigments at high fluence rates is prevented by azide. The noncyclic photosynthetic electron transport is not severely inhibited by azide because photokinesis is only in part impaired. Therefore, the hypothesis is suggested that the phototactic reaction-sign reversal generator of Anabaena is controlled by the level of an active oxygen species, probably singlet oxygen, which is quenched by azide.

References

Feb 28, 1977·Journal of Mathematical Biology·B A Taylor, J D Murray
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Citations

Jan 1, 1985·Antonie van Leeuwenhoek·H Veldkamp
May 1, 1991·Journal of Biochemical and Biophysical Methods·D P Häder, K Vogel
May 1, 1992·Biological Reviews of the Cambridge Philosophical Society·R M Klein
Jun 1, 1988·Photochemistry and Photobiology·W Nultsch, D P Häder
May 16, 2000·Journal of Bacteriology·R KortK J Hellingwerf
Feb 20, 2003·Journal of Bacteriology·Wing-On NgDevaki Bhaya
Jun 4, 2010·PloS One·John M PisciottaIlia V Baskakov
Mar 8, 2003·Molecular Microbiology·Kwang-Hwan JungJohn L Spudich
Oct 11, 2008·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Masahiko Ikeuchi, Takami Ishizuka
Mar 1, 1987·Microbiological Reviews·D P Häder

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