scholarly journals Salicylhydroxamic Acid (SHAM) Inhibition of the Dissolved Inorganic Carbon Concentrating Process in Unicellular Green Algae

1990 ◽  
Vol 92 (3) ◽  
pp. 630-636 ◽  
Author(s):  
Arun Goyal ◽  
N. Edward Tolbert
Keyword(s):  
Green Algae ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Salicylhydroxamic Acid

Regulation of dissolved inorganic carbon transport in green algae

1998 ◽  
Vol 76 (6) ◽  
pp. 1072-1083 ◽  
Author(s):  
Yusuke Matsuda ◽  
Gale G. Bozzo ◽  
Brian Colman
Keyword(s):  
Green Algae ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Inorganic Carbon Transport ◽  
Carbon Transport

Growth characteristics of bloom-forming filamentous green algae in the littoral zone of an experimentally acidified lake

1995 ◽  
Vol 52 (10) ◽  
pp. 2251-2263 ◽  
Author(s):  
Michael A. Turner ◽  
Leif J. Sigurdson ◽  
David L. Findlay ◽  
E. Todd Howell ◽  
Gordon G. C. Robinson ◽  
...  
Keyword(s):  
Water Temperature ◽  
Green Algae ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Benthic Algae ◽  
Growth Characteristics ◽  
Experimental Lakes Area ◽  
Filamentous Green Algae ◽  
High Photosynthetic Capacity ◽  
Major Factors

Filamentous green algae, predominantly Mougeotia and Zygogonium, bloom frequently in the littoral zones of acidified lakes. Growth characteristics of Zygogonium-dominated filamentous green algae were studied for 4 yr in an experimentally acidified (pH 4.5) lake at the Experimental Lakes Area of northwestern Ontario. They were present in low abundance as periphyton (algal associations attached to surfaces) during spring, and as blooms of metaphyton (benthic algae unconstrained by surfaces) beginning in midsummer and reaching a maximum in early fall. Metaphytic filamentous green algae displayed high photosynthetic capacity in summer despite the oligotrophic nature of the acidified lake. The major factors controlling photosynthetic rates of Zygogonium were similar to those controlling Mougeotia, and included algal crowding, irradiance, dissolved inorganic carbon, and water temperature. Rates of photosynthesis were negatively dependent upon algal crowding, so that highest rates were associated with minimum algal crowding. Light requirements for photosynthesis were higher than those of the epilithon, which were dominant prior to acidification. The dependence of photosynthesis on ambient concentrations of dissolved inorganic carbon was partly regulated by water temperature. Anthropogenically caused releases from growth limitations (e.g., increased availability of limiting nutrients, increased water temperature, and extension of the growing season) may cause proliferation of filamentous green algae in the future.

Regulation of dissolved inorganic carbon transport in green algae

1998 ◽  
Vol 76 (6) ◽  
pp. 1072-1083 ◽  
Author(s):  
Yusuke Matsuda ◽  
Gale G Bozzo ◽  
Brian Colman
Keyword(s):  
Signal Transduction ◽  
Green Algae ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Maximum Activity ◽  
Ribulose Bisphosphate Carboxylase ◽  
Chlorella Ellipsoidea ◽  
Bisphosphate Carboxylase ◽  
Sensing Mechanism ◽  
Ribulose Bisphosphate Carboxylase Oxygenase

The regulation of the expression of the inorganic carbon concentrating mechanism (CCM) in aquatic photoautotrophs, particularly green algae, has been thought to require light and active photosynthesis. Recent studies, however, have indicated that there may be a light-independent pathway of signal transduction in green algae that may regulate the expression of CCMs in response to changes in ambient dissolved inorganic carbon (DIC) concentration. In the green alga, Chlorella ellipsoidea, changes in the rate of transport of both CO2 and HCO3- were shown to occur in response to the CO2 concentration in the bulk medium, independent of pH, whereas other inorganic carbon species, which might induce or repress DIC transport expression, were shown to change markedly with the pH of the medium. Furthermore, neither changes in the CO2 concentration around ribulose bisphosphate carboxylase-oxygenase (Rubisco) nor light were shown to be critical factors in regulating CCM expression in this alga. CO2-insensitive mutants of Chlorella ellipsoidea were recently isolated in which DIC transport operates constitutively at maximum activity. These results strongly suggest that a direct CO2 sensing mechanism may operate at the cell surface in Chlorella ellipsoidea and that this mechanism may trigger the repression of the expression of DIC transport in response to high CO2. Some supportive evidence for this hypothesis has also been obtained in other green algae, Chlamydomonas reinhardtii and Chlorella kessleri. The possibility of the occurrence of a direct sensing mechanism for CO2, its implications, and possible coexistence of other regulatory systems for CCM expression are discussed.Key words: green algae, Chlorella, signal transduction, CO2-insensitive mutants, CO2-sensing mechanism.

Sign in / Sign up

Export Citation Format

Share Document