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Table 1 List of measured traits

From: Genome-wide association of barley plant growth under drought stress using a nested association mapping population

  Trait Abbreviation Unit Method of measurement
Imaging parameters
 1 Shoot area smoothed SAsm kPixa Smoothing spline fit to total projected shoot area data for each plant
 2 Absolute growth rate smoothed 32–40 AGR32 kPix/db Difference in smoothed Shoot Area between days 32th and 40th after planting, divided by the length of the period
 3 Absolute growth rate smoothed 42–50 AGR42 kPix/d Difference in smoothed Shoot Area between days 42th and 50th after planting, divided by the length of the period
 4 Absolute growth rate smoothed 52–59 AGR52 kPix/d Difference in smoothed Shoot Area between days 52th and 59th after planting divided by the length of the period
 5 Relative growth rate smoothed 32–40 RGR32 d−1 Difference in the logarithm of the smoothed Shoot Area at days 32th and 40th after planting, divided by the length of the period
 6 Relative growth rate smoothed 42–50 RGR42 d−1 Difference in the logarithm of the smoothed Shoot Area at days 42th and 50th after planting, divided by the length of the period
 7 Relative growth rate smoothed 52–59 RGR52 d−1 Difference in the logarithm of the smoothed Shoot Area at days 52th and 59th after planting, divided by the length of the period
 8 Convex hull area integralc CHA kPix Smallest geometrical object without concave parts that covers whole plant, top view image
 9 Caliper length integral CL kPix Max. distance between two points on the object boundary, top view image
Harvest parameters
 10 Fresh weight FW g Weight of fresh biomass per pot
 11 Dry weight DW g Weight of oven dried biomass per pot
 12 Plant height HEI cm Plant height measured from bottom to leaf tip
 13 Tiller number TN   Number of tillers per pot
Indices
 14 Water use efficiency WUE g/g water Harvested dry biomass per plant/total amount of irrigation water
  1. akPix Kilo pixel
  2. bkPix/d Kilo pixel/day
  3. cintegral: calculated for the length of entire experiment