Acquisition of inorganic carbon by the marine diatom Thalassiosira weissflogii

Functional Plant Biology : FPB
F M MorelPhilippe D Tortell

Abstract

Recent data on the physiology of inorganic carbon acquisition by the model marine diatom Thalassiosira weissflogii (Grunow) demonstrate the importance of the catalytic equilibration of HCO3-and CO2by carbonic anhydrases located in the periplasm and in the cytoplasm. These enzymes can use Zn, Co or Cd as their metal centre, and their activity increases at low ambient CO2. The silica frustule provides buffering for extracellular CA activity, The transmembrane transport of CO2 may occur by passive diffusion. Under CO2 limitation, the cytoplasmic HCO3-is used to form malate and oxaloacetic acid via phosphoenolpyruvate carboxylase. It appears that subsequent decarboxylation of these compounds in the chloroplast regenerates CO2 near the site of Rubisco, and thus provides the organism with an effective unicellular C4 photosynthetic pathway. These results, together with other published data, bring up two major questions regarding inorganic carbon acquisition in diatoms: What is the major species of inorganic carbon (CO2 or HCO3-) transported across the membrane under natural conditions? And what is the form of carbon (inorganic or organic) accumulated by the cells?

Citations

May 3, 2005·Annual Review of Plant Biology·Mario GiordanoJohn A Raven
Oct 20, 2012·The New Phytologist·Maya Haimovich-DayanAaron Kaplan
Jul 19, 2017·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Olga SayanovaJohnathan A Napier
May 15, 2007·Photosynthesis Research·Karen RobertsJohn A Raven
Jan 11, 2012·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·John A RavenStephen C Maberly
Feb 27, 2008·Physiologia Plantarum·Cheryl L Martin, Philippe D Tortell
Feb 16, 2011·Proceedings of the National Academy of Sciences of the United States of America·Brian M HopkinsonFrançois M M Morel
Feb 19, 2011·Annual Review of Marine Science·John R Reinfelder
Jan 7, 2014·Photosynthesis Research·John A RavenMario Giordano
Jun 5, 2010·Photosynthesis Research·John A Raven
Mar 10, 2016·Plant & Cell Physiology·Gilles CurienGiovanni Finazzi
Jan 16, 2007·Environmental Microbiology·Haewon ParkFrançois M M Morel
Apr 8, 2016·Current Opinion in Plant Biology·Brian M HopkinsonYusuke Matsuda

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.