Quantitative MRI analysis of structural changes in tomato tissues resulting from dehydration

Area of Science:

• Biophysics
• Plant Science
• Biomolecular Imaging

Background:

• Dehydration significantly impacts plant tissue microstructure and water content.
• Understanding water dynamics in plant tissues is crucial for agriculture and food science.
• Magnetic Resonance Imaging (MRI) offers non-invasive methods to study tissue properties.

Purpose of the Study:

• To quantitatively analyze the effects of dehydration on tomato tissue using MRI.
• To investigate changes in transverse relaxation parameters (T2) and their relationship with microstructure.
• To explore the influence of cell compartmentation, tissue heterogeneity, and composition on relaxation.

Main Methods:

• Quantitative magnetic resonance imaging (MRI) at 1.5T.
• Estimation of multi-exponential T2 maps for spatial microstructural information at voxel scale.
• Analysis of transverse relaxation parameters under varying dehydration regimes in tomato tissue.

Main Results:

• Multi-exponential T2 mapping provided spatial microstructural information.
• Water loss primarily affected large cells, while total signal intensity remained insensitive to minor water content changes.
• Variations in relaxation times were attributed to solute concentration, compartment size, and magnetic susceptibility effects from air in placental tissue.

Conclusions:

• Multi-exponential relaxation signals reflect cell compartmentation and tissue heterogeneity.
• Dehydration impacts specific cell compartments, particularly larger ones.
• Magnetic susceptibility effects in porous tissues can significantly influence observed relaxation times.