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Hornwort pyrenoids: a terrestrial exception with engineering lessons.

Tanner A Robison1,2, Juan Carlos Villarreal A3, Fay-Wei Li1,2,4

  • 1Plant Biology Section, School of Integrative Plant Science, Cornell University, Ithaca, NY, USA.

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Summary
This summary is machine-generated.

Hornwort pyrenoids, a CO₂-concentrating mechanism, evolved independently from algae. This research synthesizes hornwort pyrenoid biology, offering insights for improving photosynthesis in crops.

Keywords:
Anthoceros agrestisCO₂-concentrating mechanismsRubiscobiomolecular condensatesconvergent evolutionphotosynthesis engineering

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Area of Science:

  • Plant Biology
  • Photosynthesis Research
  • Biophysical Chemistry

Background:

  • Ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) is crucial for primary production but inefficient due to oxygenation reactions.
  • Carbon-concentrating mechanisms (CCMs) enhance Rubisco efficiency by increasing local CO₂ levels.
  • Pyrenoids, Rubisco-rich organelles in algae, represent a key biophysical CCM strategy.

Purpose of the Study:

  • To synthesize a century of research on hornwort pyrenoids as a model for CCMs.
  • To compare hornwort and algal pyrenoids in structure, components, and regulation.
  • To explore hornwort pyrenoids for improving photosynthesis engineering in crops.

Main Methods:

  • Literature synthesis of ecological, phylogenetic, and mechanistic studies on hornwort pyrenoids.
  • Comparative analysis of hornwort and algal pyrenoid ultrastructure and molecular composition.
  • Review of emerging models for pyrenoid formation, inorganic carbon delivery, and CO₂ recapture.

Main Results:

  • Hornwort pyrenoids represent an independent evolution of CCMs, adapted to terrestrial CO₂ diffusion limitations.
  • Comparative studies reveal convergent strategies and lineage-specific solutions in pyrenoid-based CCMs.
  • Distinctive hornwort Rubisco properties and biogenesis mechanisms have been identified.

Conclusions:

  • Hornwort pyrenoids offer a unique system for understanding CCM evolution and function.
  • Insights from hornworts can inform strategies for engineering C₃ crops with enhanced photosynthetic efficiency.
  • Modular engineering approaches combining hornwort and algal components show promise for photosynthesis improvement.