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Updated: Aug 7, 2025

Author Spotlight: Advancing Stomatal Research with Automated Aperture Measurement
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Calvin cycle and guard cell metabolism impact stomatal function.

P Lemonnier1, T Lawson1

  • 1School of Life Sciences, University of Essex, Wivenhoe Park, Colchester CO4 3SQ, UK.

Seminars in Cell & Developmental Biology
|March 9, 2023
PubMed
Summary
This summary is machine-generated.

Stomata regulate gas exchange critical for plant productivity. This review explores chloroplasts and mesophyll signals in stomatal function, linking carbon dioxide uptake to water loss.

Keywords:
Calvin cycleGuard cell metabolismPhotosynthesisStomatal kinetics

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Area of Science:

  • Plant Physiology
  • Plant Biochemistry

Background:

  • Stomatal conductance (g_s) balances CO2 uptake for photosynthesis (A) with water loss via transpiration, crucial for plant survival and productivity.
  • Guard cell (GC) osmoregulation and signal transduction pathways are understood, but signals coordinating mesophyll CO2 demand remain largely unknown.
  • The precise role of chloroplasts within GCs in regulating stomatal function is debated, despite their presence in many species.

Purpose of the Study:

  • To review current evidence on the role of guard cell chloroplasts in stomatal behavior.
  • To explore potential mesophyll signals influencing stomatal responses.
  • To examine the involvement of GC metabolic processes in stomatal function.

Main Methods:

  • Literature review of existing research on stomatal physiology and biochemistry.
  • Analysis of evidence regarding chloroplast function within guard cells.
  • Investigation of intercellular signaling pathways affecting stomatal conductance.

Main Results:

  • Guard cell chloroplasts may contribute to stomatal regulation through electron transport and Calvin-Benson-Bassham (CBB) cycle activity.
  • Evidence suggests a link between chloroplast activity, stomatal conductance (g_s), and photosynthetic rate (A).
  • Other metabolic processes within guard cells also play a role in modulating stomatal aperture.

Conclusions:

  • Guard cell chloroplasts and mesophyll-derived signals are likely important, yet understudied, components of stomatal regulation.
  • Further research is needed to elucidate the complex interplay between photosynthesis, mesophyll demands, and stomatal responses.
  • Understanding these mechanisms is key to improving plant water use efficiency and productivity in changing environments.