This title appears in the Scientific Report :
2000
Impact of physiological stresses on nitric oxide formation by green alga, Scenedesmus obliquus
Impact of physiological stresses on nitric oxide formation by green alga, Scenedesmus obliquus
The rate of apparent nitric oxide (NO) release, as measured in the exhaust gas of green alga, Scenedesmus obliquus, depended on the light intensity and pH. It doubled after lowering the temperature from 25 degrees C to 15 degrees C and strongly decreased from 35 degrees C to 42 degrees C. The Scened...
Saved in:
Personal Name(s): | Mallick, N. |
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Rai, L. C. / Mohn, F. H. / Soeder, C. J. | |
Contributing Institute: |
Biologie des Stoffaustauschs; ICG-6 |
Published in: | Journal of microbiology and biotechnology, 10 (2000) S. 300 - 306 |
Imprint: |
Seoul
Korean Society for Microbiology and Biotechnology
2000
|
Physical Description: |
300 - 306 |
Document Type: |
Journal Article |
Research Program: |
Pflanzenphysiologie des Spurengasaustauschs mit der Atmosphäre |
Series Title: |
Journal of Microbiology and Biotechnology
10 |
Subject (ZB): | |
Publikationsportal JuSER |
The rate of apparent nitric oxide (NO) release, as measured in the exhaust gas of green alga, Scenedesmus obliquus, depended on the light intensity and pH. It doubled after lowering the temperature from 25 degrees C to 15 degrees C and strongly decreased from 35 degrees C to 42 degrees C. The Scenedesmus cells, deficient in nitrogen or phosphorus, demonstrated a significant increase in NO production following their transfer to nitrate- and phosphate-rich media. The addition of herbicides (DCMU and glyphosate) or toxic concentrations of Cu2+ or Fe3+ produced strong NO peaks, resembling those that occurred after sudden darkening. An increase in the Ni2+ concentration to 20 ppm resulted in a gradual increase of NO release from the initial similar to 1.5 ppbv to >20 ppbv, whereas Cd2+ instantaneously suppressed the NO production. Presumably, the nitrite-dependent release of NO by the cultures of Scenedesmus was not altered by L-NNA, an inhibitor of nitric oxide synthase (NOS), or by its substrate, L-arginine. This seems to exclude the role of NOS in the NO formation under study. Accordingly, it can be assumed that the rate of NO formation is mainly a function of dynamic nitrite pool sizes and environmental factors significantly affect the NO production in algae. |