Figure 2.

Different root traits obtained with MRI versus gravimetric or WinRHIZO measurements taken after harvest immediately after the end of the particular MRI experiment. Six maize (black circles) and six barley plants (white circles) were measured 15 DAS in pots with 81 mm i.d. and 300 mm height. A linear regression (y = a*x) was fitted as a simple model (black and dashed lines for maize and barley, respectively). A, Root mass measured with MRI is displayed versus gravimetrically measured root FW, resulting in a slope of 0.69 for maize and 0.82 for barley. B, MRI root length versus WinRHIZO root length where all roots monitored with WR were taken, resulting in slopes of 0.81 for maize and 0.78 for barley. C, The same data as in (B), but here only roots with diameters >200 μm were considered for the WinRHIZO data resulting in slopes of 0.99 for maize and 0.91 for barley. D, Number of root tips detected with MRI versus WinRHIZO for maize roots with diameters >300 μm showing a slope of 0.82. FW, fresh weight; WR, WinRHIZO.