Plant Phenomics / 2021 / Article / Tab 1

Research Article

A Comparative Analysis of Quantitative Metrics of Root Architecture

Table 1

Aggregate phene metrics, definition, and method of obtaining them from SimRoot output.

Parameter3D2DDescriptionMeasurement

Total lengthYYSummed length along the whole root systemCalculated from SimRoot output
Total areaYYSummed surface area of the whole root systemCalculated from SimRoot output
Total volumeYYSummed volume of the whole root systemCalculated from SimRoot output
Maximum widthYYMaximum horizontal width of the whole root systemCalculated using minimum enclosing circle algorithm in
Maximum depthYYMaximum vertical depth of the whole root systemCalculated from SimRoot output
Median no. of rootsYYMedian no. of roots from root countsCalculated from SimRoot output
Maximum no. of rootsYYNo. of roots at the 84th percentile of a sorted list (smallest to largest) of root countsCalculated from SimRoot output
BushinessYYRatio of the maximum no. of roots to the median no. of rootsCalculated from SimRoot output
Volume distributionYYRatio of the volume of the root system contained above one-third depth of the root system to the volume of the root system contained below one-third depth of the root systemCalculated from SimRoot output
Convex hull volumeYYVolume of the convex hull that encompasses the whole root systemObtained using Convhulln function in
Convex hull areaYYSurface area of the convex hull that encompasses the whole root systemObtained using Convhulln function in
SolidityYYRatio of volume to convex hull volumeCalculated
Major ellipse axesYNLength of major axis of an ellipse best fit to overall shape and size of root systemObtained using minimum volume enclosing ellipse algorithm in
Minor ellipse axesYNLength of minor axis of an ellipse best fit to overall shape and size of root systemObtained using minimum volume enclosing ellipse algorithm in
Ellipse axis aspect ratioYNRatio of major axis of ellipse to minor axisCalculated from minor ellipse axes and major ellipse axes
Fractal dimension (FD)YYMeasure of root complexity. Fractal dimension expresses the space filling properties of a structure (e.g., root system) and is associated with branching patternObtained using box count code written in
Fractal abundance (FA)YYMeasure of root complexity. Fractal abundance is associated with the volume of space exploredObtained using box count code written in