scholarly journals Inorganic Carbon Limitation Induces Transcripts Encoding Components of the CO2-Concentrating Mechanism in Synechococcus sp. PCC7942 through a Redox-Independent Pathway

2003 ◽  
Vol 133 (4) ◽  
pp. 2069-2080 ◽  
Author(s):  
Fiona J. Woodger ◽  
Murray R. Badger ◽  
G. Dean Price
Keyword(s):  
Inorganic Carbon ◽  
Carbon Limitation ◽  
Co2 Concentrating Mechanism ◽  
Concentrating Mechanism ◽  
Synechococcus Sp ◽  
Inorganic Carbon Limitation

scholarly journals Identification of Two Genes, sll0804 and slr1306, as Putative Components of the CO2-Concentrating Mechanism in the Cyanobacterium Synechocystis sp. Strain PCC 6803

2008 ◽  
Vol 190 (24) ◽  
pp. 8234-8237 ◽  
Author(s):  
Shulu Zhang ◽  
Kevin W. Spann ◽  
Laurie K. Frankel ◽  
James V. Moroney ◽  
Terry M. Bricker
Keyword(s):  
Inorganic Carbon ◽  
Carbon Concentrating Mechanism ◽  
Co2 Concentrating Mechanism ◽  
Concentrating Mechanism ◽  
Synechocystis Sp ◽  
Pcc 6803

ABSTRACT Insertional transposon mutations in the sll0804 and slr1306 genes were found to lead to a loss of optimal photoautotrophy in the cyanobacterium Synechocystis sp. strain PCC 6803 grown under ambient CO2 concentrations (350 ppm). Mutants containing these insertions (4BA2 and 3ZA12, respectively) could grow photoheterotrophically on glucose or photoautotrophically at elevated CO2 concentrations (50,000 ppm). Both of these mutants exhibited an impaired affinity for inorganic carbon. Consequently, the Sll0804 and Slr1306 proteins appear to be putative components of the carbon-concentrating mechanism in Synechocystis sp. strain PCC 6803.

Variability of the pyrenoid-based CO2 concentrating mechanism in hornworts (Anthocerotophyta)

2002 ◽  
Vol 29 (3) ◽  
pp. 407 ◽  
Author(s):  
David Hanson ◽  
T. John Andrews ◽  
Murray R. Badger
Keyword(s):  
Active Site ◽  
Inorganic Carbon ◽  
Growth Form ◽  
Carbon Isotope Discrimination ◽  
Dissolved Inorganic Carbon ◽  
Co2 Exchange ◽  
Co2 Concentrating Mechanism ◽  
Concentrating Mechanism ◽  
C3 Photosynthesis ◽  
Catalytic Rate

Hornworts (Anthocerotophyta) are the only group of land plants with pyrenoid-containing chloroplasts. CO2 exchange and carbon isotope discrimination values (Δ13C) values have previously demonstrated the presence of a CO2 concentrating mechanism (CCM) in some pyrenoid-containing species. We have examined hornwort CCM function by using a combined fluorometer/mass spectrometer based technique to compare pyrenoid-containing (PhaeocerosProsk. and Notothylas Sull.) and pyrenoid-lacking (Megaceros Campbell) hornworts, with the liverwort Marchantia polymorphaL. that has standard C3 photosynthesis and a thalloid growth form similar to hornworts. We found that Notothylas has more CCM activity than Phaeoceros, and that Megaceros has the least CCM activity. Notothylas and Phaeoceros had compensation points from 11–13 parts per million (ppm) CO2, lower K0.5(CO2) than Marchantia, negligible photorespiration, and they accumulate a pool of dissolved inorganic carbon (DIC) between 19–108 nmol mg–1 chlorophyll. Megaceroshad an intermediate compensation point of 31 ppm CO2 (compared with 64 ppm CO2 in Marchantia), a lower K0.5(CO2) than Marchantia, and some photorespiration, but no DIC pool. We also determined the catalytic rate of carboxylation per active site of Rubisco for all four species (Marchantia, 2.6 s–1; Megaceros, 3.3 s–1; Phaeoceros, 4.2 s–1; Notothylas 4.3 s-1), and found that Rubisco content was 3% of soluble protein for pyrenoid-containing species, 4% for Megaceros and 8% for Marchantia.

scholarly journals Patterns of CO2 concentration and inorganic carbon limitation of phytoplankton biomass in agriculturally eutrophic lakes

2021 ◽  
Vol 190 ◽  
pp. 116715
Author(s):  
Horacio E. Zagarese ◽  
María de los Ángeles González Sagrario ◽  
Dieter Wolf-Gladrow ◽  
Peeter Nõges ◽  
Tiina Nõges ◽  
...  
Keyword(s):  
Phytoplankton Biomass ◽  
Inorganic Carbon ◽  
Co2 Concentration ◽  
Carbon Limitation ◽  
Eutrophic Lakes ◽  
Inorganic Carbon Limitation
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