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Light Acquisition02:16

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In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
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A CO2 Concentration Gradient Facility for Testing CO2 Enrichment and Soil Effects on Grassland Ecosystem Function
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A Changing Light Environment Induces Significant Lateral CO2 Diffusion within Maize Leaves.

Han-Yu Wu1,2, Qing-Qing Zou1, Wen-Tao Ji1

  • 1Key Laboratory of Plant Resources, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China.

International Journal of Molecular Sciences
|December 11, 2022
PubMed
Summary

Maize leaves can achieve lateral carbon dioxide (CO2) diffusion by increasing CO2 pressure differences (ΔCO2) between leaf regions. This process supports photosynthesis, even in compact leaf structures, under fluctuating light conditions.

Keywords:
CO2 partial pressurefluctuating lightleaf structurephotosynthesisrespirationsorghum

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Area of Science:

  • Plant Physiology
  • Photosynthesis Research
  • Leaf Gas Exchange

Background:

  • High leaf porosity aids internal carbon dioxide (CO2) diffusion, but maize (C4) leaves are compact, limiting this process.
  • Lateral CO2 diffusion is influenced by CO2 pressure differences (ΔCO2) between leaf areas.

Purpose of the Study:

  • To investigate if enlarging ΔCO2 in maize leaves can induce lateral CO2 diffusion despite compact structures.
  • To explore the relationship between ΔCO2, respiration, and photosynthesis in maize, cotton (C3), and other species.

Main Methods:

  • Comparative analysis of leaf structure (mesophyll porosity) and gas exchange in maize, sorghum, cotton, and cucumber.
  • Experimental manipulation of local light conditions to induce photosynthetic changes and measure ΔCO2, respiration, and photosynthetic rates.

Main Results:

  • Maize and sorghum leaves exhibit lower mesophyll porosity compared to cotton and cucumber.
  • Local photosynthetic induction in maize and cotton reduced respiration in adjacent unilluminated regions by increasing ΔCO2.
  • Under steady high light, photosynthesis induction in adjacent maize regions decreased ΔCO2 and increased photosynthetic rates.

Conclusions:

  • Enlarging ΔCO2 between adjacent leaf regions can induce lateral CO2 diffusion in maize.
  • This induced lateral diffusion supports photosynthesis in adjacent regions, particularly under fluctuating light conditions.