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Table 5 Correlation and regression coefficient between traits observed (phenotypic and geometric) and WPAi at 14 and 28 DAS

From: Non-destructive phenotyping for early seedling vigor in direct-seeded rice

Traits Regression coefficient (%) Correlation coefficient (r)
14 days 28 days 14 days 28 days
Shoot length 90.40 − 3.60 0.951** − 0.190 ns
Root length − 2.30 − 11.80 − 0.154 ns − 0.344 ns
Shoot dry weight 9.60 86.30 0.311 ns 0.929**
Root dry weight 34.11 74.40 0.584 ns 0.863*
Seed weight with mesocotyl − 12.00 0.732 ns
Mesocotyl length − 10.00 0.496 ns
Stem weight 82.30 0.920**
Tiller number 79.80 0.970**
Stem thickness 17.70 27.30 0.422 ns 0.526 ns
Leaf number/plant 30.30 91.20 0.551 ns 0.955**
First leaf weight − 1.20 − 24.10 0.241 ns − 0.491 ns
Second leaf weight 40.00 9.60 0.645 ns 0.318 ns
Third leaf weight 54.90 − 0.01 0.661 ns − 0.001 ns
Fourth leaf weight − 0.503 ns
Fifth leaf weight − 0.188 ns
Six leaf weight 17.50 0.419 ns
Seventh leaf weight 15.00 0.192 ns
First leaf length 18.52 5.19 − 0.398 ns − 0.227 ns
Second leaf length 21.19 29.26 0.470 ns − 0.538 ns
Third leaf length 77.64 38.41 0.892** − 0.614 ns
Fourth leaf length 27.67 − 0.550 ns
Fifth leaf length 21.77 0.467 ns
Sixth leaf length 6.80 0.374 ns
Seventh leaf length 5.09 0.287 ns
First leaf width 0.73 15.89 − 0.074 ns − 0.364 ns
Second leaf width − 6.55 9.74 − 0.367 ns − 0.303 ns
Third leaf width 2.33 8.42 0.150 ns − 0.242 ns
Fourth leaf width 7.99 0.290 ns
Fifth leaf width 2.54 0.163 ns
Sixth leaf width 24.23 0.526 ns
Seventh leaf width 35.33 0.634 ns
First leaf area 14.26 9.30 − 0.390 ns − 0.305 ns
Second leaf area 18.02 24.42 0.400 ns − 0.494 ns
Third leaf area 51.29 18.06 0.730 ns − 0.425 ns
Fourth leaf area 00.75 − 0.087 ns
Fifth leaf area 77.79 0.882**
Sixth leaf area 53.25 0.644 ns
Seventh leaf area 14.65 0.395 ns
Stem area 61.33 1.59 0.840** − 0.126 ns
Eccentricity − 27.30 45.80 0.960** 0.677 ns
Convex hull − 25.20 79.20 0.927** 0.890**
Caliper length − 48.30 77.60 0.984** 0.881**
Top view area − 1.90 93.20 0.562 ns 0.965**
Compactness 17.60 − 1.00 0.725 ns − 0.101 ns
  1. NS non-significant
  2. * p < 0.05; ** p < 0.001