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Land plant biochemistry.

J A Raven1

  • 1Department of Biological Sciences, Univervity of Dundee, UK.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|July 25, 2000
PubMed
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Charophycean algae are the closest relatives to land plants (embryophytes). Biochemical differences, like specialized lipids and phenolics, reflect adaptations to terrestrial life and early Earth conditions.

Area of Science:

  • Evolutionary Biology
  • Plant Science
  • Biochemistry

Background:

  • Charophyceae are identified as the closest extant algal relatives to embryophytes, supported by ultrastructural, molecular genetic, and biochemical data.
  • The gene rbcL, encoding the large subunit of ribulose bisphosphate carboxylase-oxygenase (RUBISCO), is crucial for molecular phylogenetic studies.

Purpose of the Study:

  • To investigate the biochemical distinctions between charophycean algae and embryophytes.
  • To explore the functional implications of these biochemical differences in the context of early land plant evolution and environmental conditions.

Main Methods:

  • Comparative analysis of biochemical components and their functions.
  • Phylogenetic analysis using molecular data, including the rbcL gene.

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Main Results:

  • RUBISCO in embryophytes originates from cyanobacteria via Chlorophyta, exhibiting a range of kinetic properties.
  • Bryophyte RUBISCO kinetics are comparable to other embryophytes, suggesting adaptation to high CO2 levels in the Lower Palaeozoic.
  • Embryophytes possess unique biochemical components such as water-repellent lipids, phenolic polymers, flavonoids for UV-B absorption, and retained organic acids, differing from charophytes.

Conclusions:

  • Biochemical differences between charophytes and embryophytes are functionally linked to the adaptation of plants to terrestrial environments.
  • The evolution of terrestrial embryophytes was influenced by environmental factors, including high atmospheric CO2.
  • Further research is needed to determine if the absence of certain biochemical pathways in bryophytes is due to evolutionary loss.