Fig. 3
From: Non-invasive imaging of plant roots in different soils using magnetic resonance imaging (MRI)
Barley plants were imaged using MRI 3 weeks after sowing. a Maximum intensity projections of the 3D image data (Image resolution: 0.5 × 0.5 × 1.0 mm3, MRI noise level σ = 0.033). Branching lateral roots are visible in NMR soil, Sp2.1, Sp2.2, Sp2.3, and in Brown’s soil. In Sp2.4 and Sp5M, the soil reduced the MRI signal obtained from the roots, shifting the lateral root signal below the MRI detection limit. b Comparison of root length plotted against the root diameter as determined for the whole plant by MRI and WinRhizo after harvest. For better visualization, the y-axis (root length) of Brown’s soil has a different scale than the substrates. In Sp2.4 and Sp5M, the reduced root signal leads to an underestimation of root thickness in the MRI analysis. Error bars: ± 1 SD