Acquisition and metabolism of carbon in the Ochrophyta other than diatoms

John A. Raven, Mario Giordano (Lead / Corresponding author)

Research output: Contribution to journalReview article

11 Citations (Scopus)

Abstract

The acquisition and assimilation of inorganic C have been investigated in several of the 15 clades of the Ochrophyta other than diatoms, with biochemical, physiological and genomic data indicating significant mechanistic variation. Form ID Rubiscos in the Ochrophyta are characterized by a broad range of kinetics values. In spite of relatively high K0.5CO2 and low CO2 : O2 selectivity, diffusive entry of CO2 occurs in the Chrysophyceae and Synurophyceae. Eustigmatophyceae and Phaeophyceae, on the contrary, have CO2 concentrating mechanisms, usually involving the direct or indirect use of [Formula: see text] This variability is possibly due to the ecological contexts of the organism. In brown algae, C fixation generally takes place through a classical C3 metabolism, but there are some hints of the occurrence of C4 metabolism and low amplitude CAM in a few members of the Fucales. Genomic data show the presence of a number of potential C4 and CAM genes in Ochrophyta other than diatoms, but the other core functions of many of these genes give a very limited diagnostic value to their presence and are insufficient to conclude that C4 photosynthesis is present in these algae.This article is part of the themed issue 'The peculiar carbon metabolism in diatoms'.

Original languageEnglish
JournalPhilosophical Transactions of the Royal Society B - Biological Sciences
Volume372
Issue number1728
Early online date17 Jul 2017
DOIs
Publication statusPublished - 5 Sep 2017

Fingerprint

Diatoms
Bacillariophyceae
Metabolism
Phaeophyta
Phaeophyceae
Carbon
Computer aided manufacturing
Algae
algae
metabolism
carbon
Chrysophyta
Genes
Eustigmatophyceae
Chrysophyceae
Fucales
genomics
C4 photosynthesis
Photosynthesis
disease diagnosis

Cite this

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title = "Acquisition and metabolism of carbon in the Ochrophyta other than diatoms",
abstract = "The acquisition and assimilation of inorganic C have been investigated in several of the 15 clades of the Ochrophyta other than diatoms, with biochemical, physiological and genomic data indicating significant mechanistic variation. Form ID Rubiscos in the Ochrophyta are characterized by a broad range of kinetics values. In spite of relatively high K0.5CO2 and low CO2 : O2 selectivity, diffusive entry of CO2 occurs in the Chrysophyceae and Synurophyceae. Eustigmatophyceae and Phaeophyceae, on the contrary, have CO2 concentrating mechanisms, usually involving the direct or indirect use of [Formula: see text] This variability is possibly due to the ecological contexts of the organism. In brown algae, C fixation generally takes place through a classical C3 metabolism, but there are some hints of the occurrence of C4 metabolism and low amplitude CAM in a few members of the Fucales. Genomic data show the presence of a number of potential C4 and CAM genes in Ochrophyta other than diatoms, but the other core functions of many of these genes give a very limited diagnostic value to their presence and are insufficient to conclude that C4 photosynthesis is present in these algae.This article is part of the themed issue 'The peculiar carbon metabolism in diatoms'.",
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Acquisition and metabolism of carbon in the Ochrophyta other than diatoms. / Raven, John A.; Giordano, Mario (Lead / Corresponding author).

In: Philosophical Transactions of the Royal Society B - Biological Sciences, Vol. 372, No. 1728, 05.09.2017.

Research output: Contribution to journalReview article

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