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Light Acquisition

Light Acquisition

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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Related Experiment Video

Updated: Feb 24, 2026

Calibrated Passive Sampling - Multi-plot Field Measurements of NH3 Emissions with a Combination of Dynamic Tube Method and Passive Samplers

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Published on: March 21, 2016

A Scalable Field Study Protocol and Rationale for Passive Ambient Air Sampling: A Spatial Phytosampling for Leaf Data

Tonny J Oyana^1,2, Slawomir M Lomnicki¹, Chuqi Guo¹

¹Department of Environmental Sciences, Louisiana State University , Baton Rouge, Louisiana 70803, United States.

Environmental Science & Technology

|August 15, 2017

Summary

Environmentally persistent free radicals (EPFRs) on airborne fine particulate matter (PM2.5) were measured using a novel plant-based sampling method. This approach identified spatial variations and potential exposure hotspots in Memphis.

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Last Updated: Feb 24, 2026

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Published on: July 6, 2022

Area of Science:

Environmental Science
Analytical Chemistry
Public Health

Background:

Environmentally persistent free radicals (EPFRs) are found on airborne fine particulate matter (PM2.5).
EPFRs originate from combustion and vehicular exhaust, persisting in the environment and biological systems.
Current measurement methods using high-volume samplers limit representativeness of community exposure.

Purpose of the Study:

To develop and validate a novel spatial phytosampling methodology for studying EPFR concentrations in PM2.5.
To investigate the spatial distribution patterns of EPFRs in airborne PM2.5 across Memphis, Tennessee.
To identify potential EPFR exposure hotspots and inform demographic health studies.

Main Methods:

Phytosampling: Leaf samples collected from 188 random sites within a 500-m buffer zone of pollution sources.
PM Isolation and Fractionation: Particulate matter isolated from intact leaves and size-fractionated.
EPFR Quantification: Electron paramagnetic resonance (EPR) spectroscopy used to quantify EPFRs on PM.

Main Results:

A novel spatial phytosampling method was successfully developed for EPFR analysis in PM2.5.
Spatial variations in EPFR concentrations were identified across the Memphis sampling grid.
Radical concentration positively correlated with the EPFR g-value, indicating higher oxygen-centered radical content.

Conclusions:

Spatial phytosampling provides a valuable approach to assess EPFR exposure patterns.
The study identified potential EPFR exposure hotspots in Memphis.
This method offers insights for health studies investigating exposure and demographic differences.