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Passive CO2 concentration in higher plants.

Rowan F Sage1, Roxana Khoshravesh1

  • 1Department of Ecology and Evolutionary Biology, University of Toronto, 25 Willcocks Street, Toronto, ON M5S3B2, Canada.

Current Opinion in Plant Biology
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Summary
This summary is machine-generated.

Plants use passive CO2 concentration mechanisms, like C2 photosynthesis, to overcome limitations in warm, low CO2 environments. This strategy enhances carbon economy and plant fitness by reducing photorespiration.

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Area of Science:

  • Plant Physiology
  • Biochemistry
  • Evolutionary Biology

Background:

  • C3 photosynthesis faces limitations in warm, low CO2 conditions due to photorespiration.
  • Active CO2 concentrating mechanisms (e.g., C4 photosynthesis) require ATP.
  • Plants have evolved passive CO2 concentration strategies to enhance carbon fixation without extra ATP.

Purpose of the Study:

  • To explore passive CO2 concentration mechanisms in C3 plants.
  • To understand how plants accumulate CO2 around Rubisco without ATP expenditure.
  • To investigate the role of passive CO2 concentration in plant fitness.

Main Methods:

  • Analysis of C2 photosynthesis involving glycine decarboxylase localization.
  • Examination of chloroplast sheaths around mesophyll cell peripheries.
  • Investigation of CO2 channeling from heterotrophic tissues (stems, fruits, flowers) and roots/rhizomes.
  • Study of CO2 transport via lacunae, aerenchyma, and xylem.

Main Results:

  • Passive CO2 accumulation occurs by localizing photorespired CO2 around Rubisco.
  • C2 photosynthesis and chloroplast peripheral sheaths are mechanisms for passive CO2 concentration.
  • Passive CO2 concentration is common in organs with high diffusive resistance and heterotrophic tissues.
  • CO2 is channeled from roots and rhizomes into photosynthetic tissues via specialized structures.
  • Passive CO2 concentration reduces photorespiration in chloroplasts.

Conclusions:

  • Passive CO2 concentration mechanisms allow C3 plants to improve carbon economy.
  • These strategies enhance plant fitness, particularly during periods of low atmospheric CO2.
  • Passive CO2 concentration represents an efficient adaptation to environmental stress.