Complete root specimen of plants grown in soil-filled root box: sampling, measuring, and staining method

Area of Science:

• Plant science
• Agronomy
• Soil science

Background:

• Understanding plant resource capture requires detailed root system architecture data.
• Current methods often fail to preserve whole root specimens without displacement.
• A novel sampling equipment is introduced to address these limitations.

Purpose of the Study:

• To assess the equipment's ability to rapidly sample entire root systems.
• To determine if root surface area is measurable from scanned digital images.
• To evaluate the utility of staining for visualizing root-soil interactions and physiological functions.

Main Methods:

• Developed root system sampling equipment for intact root box specimens.
• Validated the method using soybean and buckwheat cultivars under different treatments.
• Quantified root surface area from scanned images and compared with traditional methods.
• Utilized staining techniques to visualize arbuscular mycorrhizal colonization and root respiratory activity.

Main Results:

• The equipment successfully sampled intact whole root systems of soybean and buckwheat.
• Root surface area calculated from scanned images strongly correlated with traditional methods.
• Staining revealed localized root proliferation due to arbuscular mycorrhizal colonization in soybean.
• Staining allowed examination of root respiratory activity across different depths in buckwheat.

Conclusions:

• The developed method allows fast, accurate whole root specimen production and precise root surface area calculation.
• Staining techniques provide multidimensional insights into soil-root interactions and physiological functions.
• This approach will advance agronomic management and breeding programs for sustainable food production.