Table 18 Eigen vectors associated with the first five principal components and the proportion and cumulative contributions for 16 agronomic and yield traits of 196 bread wheat genotypes evaluated in 2021 and 2022 under drought-stressed condition
Traits | Principal components | ||||
|---|---|---|---|---|---|
PC1 | PC2 | PC3 | PC4 | PC5 | |
Days to heading | − 0.00 | 0.67 | − 0.01 | − 0.14 | 0.08 |
Grain filling period | 0.11 | − 0.42 | − 0.15 | − 0.06 | 0.05 |
Days to maturity | 0.08 | 0.54 | − 0.12 | − 0.22 | 0.14 |
Plant height (cm) | 0.09 | − 0.12 | − 0.29 | − 0.49 | 0.35 |
Number of tillers plant−1 | 0.09 | − 0.02 | − 0.29 | − 0.23 | − 0.06 |
Spike length | 0.07 | − 0.14 | − 0.10 | − 0.01 | 0.79 |
Flag leaf area (cm2) | 0.06 | 0.07 | 0.28 | 0.55 | 0.39 |
Number of spikelets spike−1 | 0.35 | 0.07 | − 0.16 | 0.27 | 0.02 |
Fertile spikelets spike−1(%) | 0.36 | 0.07 | − 0.20 | 0.25 | − 0.01 |
Number of kernels spike−1 | 0.36 | 0.09 | − 0.20 | 0.25 | − 0.03 |
Spike fertility (%) | 0.28 | 0.08 | − 0.32 | 0.04 | − 0.13 |
Biomass yield (t ha−1) | 0.34 | − 0.09 | 0.02 | − 0.13 | − 0.13 |
Harvest index (%) | 0.16 | 0.08 | 0.53 | − 0.22 | 0.13 |
Kernels weight spike −1 (g) | 0.36 | − 0.06 | 0.19 | − 0.06 | − 0.06 |
Thousand kernels weight (g) | 0.34 | − 0.11 | 0.24 | − 0.20 | − 0.10 |
Grain yield (t ha−1) | 0.33 | − 0.02 | 0.36 | − 0.17 | 0.01 |
Eigen values | 6.28 | 2.15 | 1.42 | 1.27 | 1.04 |
Explained variance (%) | 39.25 | 13.42 | 8.86 | 7.94 | 6.53 |
Cumulative variance (%) | 39.25 | 52.67 | 61.53 | 69.47 | 76.00 |