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Light Acquisition02:16

Light Acquisition

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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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In-Field Wheat Reflectance: How to Reach the Organ Scale?

Sébastien Dandrifosse1, Alexis Carlier1, Benjamin Dumont2

  • 1Biosystems Dynamics and Exchanges, TERRA Teaching and Research Center, Gembloux Agro-Bio Tech, University of Liège, 5030 Gembloux, Belgium.

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This study introduces a new method for measuring wheat reflectance at the organ level, separating leaf and ear signals. This technique enables detailed analysis of crop physiology and architecture for improved agricultural insights.

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Area of Science:

  • Agricultural Science
  • Remote Sensing
  • Plant Physiology

Background:

  • Crop reflectance is key to understanding wheat architecture and physiology.
  • Current methods cannot distinguish reflectance from wheat leaves and ears separately.

Purpose of the Study:

  • To develop a high-throughput method for measuring wheat reflectance at the organ scale.
  • To enable the separation of leaf and ear reflectance for detailed crop analysis.

Main Methods:

  • Utilized a nadir multispectral camera array and incident light spectrometer to create bi-directional reflectance factor (BRF) maps.
  • Employed image thresholding and deep learning for ear detection to segment wheat organs.
  • Conducted measurements throughout the wheat growing season across different varieties and fertilization gradients.

Main Results:

  • Developed a method to successfully segment wheat ears and leaves for organ-scale reflectance measurement.
  • Observed that wheat organ BRF is influenced by time of day, sky conditions, and sun altitude.
  • Demonstrated consistent reflectance dynamics across various wheat growth scenarios and architectures.

Conclusions:

  • The new method allows for high-throughput, organ-scale reflectance measurements in wheat crops.
  • Optimal measurement conditions include close to solar noon, with reference panel calibration at the start and end of field trips.
  • This technique provides consistent reflectance data, valuable for studying wheat physiology and architecture.