Table 3 Genetic correlations between secondary traits and grain yield
EnvironmentDTHD correctionSecondary Traits
CT-GFCT-VEGGNDVI-GFGNDVI-VEGRNDVI-GFRNDVI-VEG
OptimalUncorrected−0.65−0.50.270.380.330.33
Corrected−0.63−0.490.240.440.330.35
DroughtUncorrected−0.59−0.53−0.29−0.41−0.12−0.43
Corrected−0.59−0.51−0.06−0.230.03−0.42
Severe droughtUncorrected−0.410.01−0.54−0.62−0.4−0.77
Corrected−0.40.03−0.46−0.46−0.33−0.73
Late heatUncorrected−0.73−0.660.44−0.140.340.47
Corrected−0.73−0.650.54−0.130.390.51
Early heatUncorrected−0.7−0.710.710.610.730.67
Corrected−0.7−0.720.680.580.710.67
  • Values ≥ |0.09| are significant at the 0.05 level of significance. DTHD, Days to heading; CT, Canopy temperature; GNDVI, Normalized difference vegetation index based on the difference between near-infrared and green light reflectance; GY, Grain yield; RDNVI, Normalized difference vegetation index based on the difference between near-infrared and red reflectance; GF, Grain filling; VEG, Vegetative.