Respiratory losses in the light in a marine diatom: Measurements by short-term mass spectrometry. [Thalassiosira weisflogii]
Journal Article
·
· Limnology and Oceanography; (United States)
- Queen's Univ., Kingston, Ontario (Canada)
- Brookhaven National Lab., Upton, NY (United States)
Mass spectrometric analysis of gas exchange by the diatom Thalassiosira weisflogii grown under 12:12 L/D cycles indicates that mitochondrial respiration is highest in the light, averaging 54 {mu}mol O{sub 2}(mg Chl {alpha}){sup {minus}1} h{sup {minus}1} while gross photosynthesis was 162 {mu}mol O{sub 2}(mg Chl {alpha}){sup {minus}1} h{sup {minus}1}. In the dark, mitochondrial O{sub 2} consumption slowly decreased to a minimum of 29 {mu}mol(mg Chl {alpha}){sup {minus}1} h{sup {minus}1} at the end of scotophase. When cells were poised at the DIC (dissolved inorganic carbon) compensation point in the light (DIC concentration where net photosynthesis equals zero), mitochondrial O{sub 2} consumption was only slightly higher than in the dark. Adding DIC to cells at the compensation point resulted in a rapid increase in both photosynthetic O{sub 2} evolution and mitochondrial O{sub 2} consumption, indicating that the higher mitochondrial respiration rates observed in the light are probably due to an increase in substrate supply from photosynthesis. If estimates of primary production are based on oxygen exchange, this effect is accounted for; however if radiocarbon is used to measure production, especially in short-term measurements, net production may be significantly overestimated.
- OSTI ID:
- 5681295
- Journal Information:
- Limnology and Oceanography; (United States), Journal Name: Limnology and Oceanography; (United States) Vol. 34:7; ISSN LIOCA; ISSN 0024-3590
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
551000* -- Physiological Systems
59 BASIC BIOLOGICAL SCIENCES
ALGAE
CELL CONSTITUENTS
CHEMICAL REACTIONS
CHROMOPHYCOTA
DIATOMS
ECOLOGY
ELECTROMAGNETIC RADIATION
MASS SPECTROSCOPY
MITOCHONDRIA
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PLANTS
PRODUCTIVITY
RADIATIONS
RESPIRATION
SPECTROSCOPY
SYNTHESIS
VISIBLE RADIATION
59 BASIC BIOLOGICAL SCIENCES
ALGAE
CELL CONSTITUENTS
CHEMICAL REACTIONS
CHROMOPHYCOTA
DIATOMS
ECOLOGY
ELECTROMAGNETIC RADIATION
MASS SPECTROSCOPY
MITOCHONDRIA
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PLANTS
PRODUCTIVITY
RADIATIONS
RESPIRATION
SPECTROSCOPY
SYNTHESIS
VISIBLE RADIATION