FIGURE 6.

Local diameter in pixels of the adventitious root along its length. From the adventitious root identified and reconstituted by the algorithm, the calculation of its local diameter becomes possible by measuring the number of pixels occupied by the root throughout its length, allowing therefore the measurements of more diverse parameters such as the diameter of the root apexes in different stress conditions. In this case the root diameter is indeed decreasing as the distance from the cutting gets further. DIA: Diameter and ARL: Adventitious Root Length. The values of the diameter are after converted in mm using image calibration procedure: in our case 1 pixel is equivalent to 1 mm.