Carbon Fixation in Diatoms

Matsuda, Yusuke; Kroth, Peter G.

doi:10.1007/978-94-017-8742-0_18

Cited by 19 publications

(14 citation statements)

References 181 publications

(195 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The CCM regulation in diatoms is highly dependent on light as well as CO 2 concentration (Harada et al, 2006). However, the major determinant of the extent of CCM expression in P. tricornutum is CO 2 concentration, as it is in green algae (Matsuda and Kroth, 2014) and many components of CCM are suppressed under elevated CO 2 concentrations and induced at atmospheric levels or lower. The CO 2 concentration affects expression, and consequently the activity, of not only CCMs components but also that of enzymes from metabolic pathways such as the CBB cycle and glycolysis, though this is still understudied.…”

Section: Effect Of Comentioning

confidence: 99%

Regulation of Carbon Metabolism by Environmental Conditions: A Perspective From Diatoms and Other Chromalveolates

et al. 2020

View full text Add to dashboard Cite

Diatoms belong to a major, diverse and species-rich eukaryotic clade, the Heterokonta, within the polyphyletic chromalveolates. They evolved as a result of secondary endosymbiosis with one or more Plantae ancestors, but their precise evolutionary history is enigmatic. Nevertheless, this has conferred them with unique structural and biochemical properties that have allowed them to flourish in a wide range of different environments and cope with highly variable conditions. We review the effect of pH, light and dark, and CO 2 concentration on the regulation of carbon uptake and assimilation. We discuss the regulation of the Calvin-Benson-Bassham cycle, glycolysis, lipid synthesis, and carbohydrate synthesis at the level of gene transcripts (transcriptomics), proteins (proteomics) and enzyme activity. In contrast to Viridiplantae where redox regulation of metabolic enzymes is important, it appears to be less common in diatoms, based on the current evidence, but regulation at the transcriptional level seems to be widespread. The role of post-translational modifications such as phosphorylation, glutathionylation, etc., and of protein-protein interactions, has been overlooked and should be investigated further. Diatoms and other chromalveolates are understudied compared to the Viridiplantae, especially given their ecological importance, but we believe that the ever-growing number of sequenced genomes combined with proteomics, metabolomics, enzyme measurements, and the application of novel techniques will provide a better understanding of how this important group of algae maintain their productivity under changing conditions.

show abstract

Section: Effect Of Comentioning

confidence: 99%

Regulation of Carbon Metabolism by Environmental Conditions: A Perspective From Diatoms and Other Chromalveolates

et al. 2020

View full text Add to dashboard Cite

show abstract

“…To overcome this constraint, many phytoplankton species have developed an intracellular mechanisms that converts bicarbonate ions (HCO3 − ) to CO 2 at the active site of this enzyme, thereby supporting higher carbon fixation rates than what would be possible if photosynthesis only relied on diffusive CO 2 uptake (Giordano et al, 2005). The proportion at which both processes operate (i.e., direct CO 2 uptake vs. HCO3 − uptake) varies largely among species (e.g., Reinfelder, 2011;Matsuda and Kroth, 2014), as they differ in the efficiency and regulation of their CCMs (Burkhardt et al, 2001;Rost et al, 2003;Trimborn et al, 2008). Increases in the seawater CO 2 may directly benefit phytoplankton species primarily relying on diffusive CO 2 uptake or those with inefficient CCMs.…”

Section: Influence Of Elevated Pco 2 On Contrasting Phytoplankton Assmentioning

confidence: 99%

Response of Phytoplankton Assemblages From Naturally Acidic Coastal Ecosystems to Elevated pCO2

et al. 2020

View full text Add to dashboard Cite

“…Due to the diverse and often extreme habitats they inhabit, it is not surprising that diatoms have evolved multiple ways to acquire inorganic C for growth. Several reviews focus on the function and diversity of diatom CCMs, including Roberts et al, 2007b;Matsuda and Kroth, 2014. Compared to other photoautotrophs, the form of rubisco found in diatoms has a relatively high specificity for CO 2 vs. O 2 (Badger et al, 1998;Tortell, 2000); nevertheless, the low equilibrium concentration and low diffusion coefficient for CO 2 in water would limit photosynthesis without a CCM. Numerous studies that measured C fluxes across external diatom membranes show that CO 2 as well as HCO 3 can be taken up by the cells (see below).…”

Section: Diatomsmentioning

confidence: 99%