μCT trait analysis reveals morphometric differences between domesticated temperate small grain cereals and their wild...

Area of Science:

• Agricultural Science
• Archaeobotany
• Genetics

Background:

• Wheat and barley are crucial founder crops from the Fertile Crescent with significant economic importance.
• Grain morphometric traits are vital for crop yield, quality, and end-use, influencing modern breeding programs.
• Human selection is believed to have shaped these grain characteristics over time.

Purpose of the Study:

• To accurately assess three-dimensional (3D) grain characteristics using advanced imaging and modeling.
• To investigate variations in grain size and shape across wild and domesticated wheat and barley.
• To develop a predictive model for grain domestication status.

Main Methods:

• Utilized X-ray microcomputed tomography (μCT) for high-resolution 3D imaging of grains.
• Developed custom image analysis tools and mathematical modeling for quantitative trait assessment.
• Analyzed morphometric parameters (length, width, depth) in wild and domesticated wheat and barley.

Main Results:

• Grain depth and width were identified as primary drivers of shape variation.
• These traits exhibit plasticity, particularly in modern bread wheat varieties.
• Ploidy level significantly influences grain depth, and a predictive model accurately classified wild vs. domesticated grains.

Conclusions:

• Grain depth and width are key selectable traits in wheat and barley domestication.
• The developed model effectively predicts the origin (wild or domesticated) of wheat and barley grains.
• This approach has broad applications in archaeobotany and crop breeding.