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Related Concept Videos

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  1. Home
  3. Fast Dehydration Reduces Bundle Sheath Conductance In C4 Maize And Sorghum.
  1. Home
  3. Fast Dehydration Reduces Bundle Sheath Conductance In C4 Maize And Sorghum.

Related Experiment Video

Measurement of Leaf Hydraulic Conductance and Stomatal Conductance and Their Responses to Irradiance and Dehydration Using the Evaporative Flux Method EFM
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Fast dehydration reduces bundle sheath conductance in C4 maize and sorghum.

Chandra Bellasio1,2,3,4, Hilary Stuart-Williams4, Graham D Farquhar4

  • 1Laboratory of Theoretical and Applied Crop Ecophysiology, School of Biology and Environmental Science, University College Dublin, Belfield, Dublin 4, D04V1W8, Ireland.

The New Phytologist
|October 26, 2024

View abstract on PubMed

Summary
This summary is machine-generated.

Drought severely impacts C4 plant photosynthesis by reducing CO2 conductance between leaf cells. This disrupts essential metabolite exchange, hindering the plants

Keywords:
carbon reactiondroughtisotopic discriminationlimitationmodelphotosynthesis

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Area of Science:

  • Plant Physiology
  • Biochemistry
  • Climate Change Adaptation

Background:

  • Anthropogenic warming increases drought frequency, threatening global food security.
  • C4 plants possess a CO2 concentrating mechanism enhancing water use efficiency and productivity in hot climates.
  • Dehydration significantly reduces photosynthetic efficiency in C4 plants, necessitating investigation into underlying mechanisms.

Purpose of the Study:

  • To investigate the physiological mechanisms responsible for the decline in C4 photosynthesis during rapid dehydration.
  • To elucidate the role of intercellular CO2 conductance and metabolite exchange in C4 plant response to drought stress.

Main Methods:

  • Conducted fast dehydration experiments on C4 leaves.
  • Measured gas exchange, including water and CO2 fluxes and isotopic composition.
  • Utilized a novel biochemical model and elasticity analysis for data interpretation.

    • Main Results:

    • CO2 supply to mesophyll and bundle sheath cells remained stable during dehydration.
    • A significant decrease in CO2 conductance at the bundle sheath-mesophyll interface was observed.
    • Intercellular metabolite exchange slowed, impeding reducing power supply to the bundle sheath.

    Conclusions:

    • Reduced CO2 conductance at the bundle sheath-mesophyll interface is a key factor in C4 photosynthesis decline under dehydration.
    • This impairment leads to phosphoglycerate accumulation and feedback inhibition of Rubisco.
    • The rapid sensitivity of C4 photosynthesis to dehydration may significantly influence their competitive performance and drought resilience.