3D X-ray Microscopy Lights up Nanoparticles in Plants.

Area of Science:

• Plant Physiology
• Nanotechnology
• Microscopy

Background:

• Current microscopy methods for plant tissues are limited to surface analysis or require destructive preparation.
• Probing subcellular physiological processes in living plants is essential for discovering new fertilization strategies.

Purpose of the Study:

• To develop and demonstrate an in vivo 3D X-ray microscopy technique for visualizing nanoparticle behavior within plant tissues.
• To enable direct observation of nanoparticle transport and dissolution for improved fertilizer development.

Main Methods:

• Utilized advanced experimental designs and quantitative analysis for in vivo 3D X-ray microscopy.
• Achieved isotropic voxel sizes down to 50 nm for high-resolution imaging deep within plant tissues.
• Visualized foliar-applied, untagged clustered nanoparticulate fertilizers (MSN and nPAA-MnO2) in living plant tissue.

Main Results:

• Successfully visualized clustered nanoparticles deep beneath the leaf surface, inaccessible to other microscopy techniques.
• Demonstrated the natural clustering of MSN particles and CaCl2-induced clustering of nPAA-MnO2 particles in situ.
• Provided direct in vivo evidence of nanoparticle transport and dissolution within living plant tissue.

Conclusions:

• The developed in vivo 3D X-ray microscopy approach overcomes limitations of traditional methods.
• This technique is critical for understanding nanoparticle-plant interactions and advancing sustainable fertilization.
• Enables direct observation of fertilizer fate within plants, paving the way for optimized delivery systems.