Search: onr:"swepub:oai:DiVA.org:su-58539" >
Photosynthetic util...
Photosynthetic utilization of bicarbonate in Zostera marina is reduced by inhibitors of mitochondrial ATPase and electron transport
-
- Carr, Herman (author)
- Stockholms universitet,Botaniska institutionen
-
Axelsson, Lennart (author)
-
(creator_code:org_t)
- 2008-04-23
- 2008
- English.
-
In: Plant Physiology. - : Oxford University Press (OUP). - 0032-0889 .- 1532-2548. ; 147:2, s. 879-885
- Related links:
-
http://www.plantphys...
-
show more...
-
https://urn.kb.se/re...
-
https://doi.org/10.1...
-
show less...
Abstract
Subject headings
Close
- When Zostera marina was irradiated after a period of darkness, initiation of photosynthetic O-2 evolution occurred in two phases. During a lag phase, lasting 4 to 5 min, photosynthesis was supported by a diffusive entry of CO2. Photosynthesis then rapidly increased to its full rate. Tris buffer, at a concentration of 50 mM, completely inhibited this increase without affecting CO2-supported photosynthesis during the lag phase. These results verify that the increase in photosynthesis after the lag phase depended on an activation of bicarbonate (HCO3-) utilization through acid zones generated by proton pumps located to the outer cell membrane. In similar experiments, 6.25 mu M of the mitochondrial ATPase blocker oligomycin inhibited photosynthetic HCO3- utilization by more than 60%. Antimycin A, a selective blocker of mitochondrial electron transport, caused a similar inhibition of HCO3- utilization. Measurements at elevated CO2 concentrations verified that neither oligomycin nor antimycin interfered with linear photosynthetic electron transport or with CO2 fixation. Thus, a major part of the ATP used for the generation of acid zones involved in HCO3- utilization in Z. marina was derived from mitochondrial respiration.
Subject headings
- NATURVETENSKAP -- Biologi -- Botanik (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Botany (hsv//eng)
Keyword
- inorganic carbon acquisition
- co2 concentrating mechanisms
- barley hordeum-vulgare
- mesophyll protoplasts
- oxidative-metabolism
- laminaria-saccharina
- uncoupling protein
- plasma-membrane
- chara-corallina
- zmpump encodes
- Plant physiology
- Växtfysiologi
Publication and Content Type
- ref (subject category)
- art (subject category)
Find in a library
To the university's database