Table 1 Eigenvectors and eigenvalues for the principal components (PC1, PC2, PC3, and PC4) derived from the variants: RRE, RSE, Cd concentrations in root and shoot (Cd/r and Cd/s), and relative MDA, H2O2, SOD, and APX in root and shoot (MDA/r, MDA/s, H2O2/r, H2O2/s, SOD/r, SOD/s, APX/r, and APX/s)
Eigenvectors | PC1 | PC2 | PC3 | PC4 |
|---|---|---|---|---|
RRE | − 0.1731 | 0.5049 | 0.0771 | − 0.2975 |
RSE | 0.4088 | 0.0353 | 0.0810 | 0.0199 |
Cd/r | − 0.3804 | − 0.1160 | 0.0248 | 0.2456 |
Cd/s | − 0.3399 | 0.0403 | 0.0255 | 0.1003 |
MDA/r | − 0.0154 | − 0.0208 | − 0.6365 | 0.4529 |
MDA/s | − 0.1973 | − 0.2640 | 0.5915 | − 0.0461 |
H2O2/r | 0.3552 | − 0.2538 | 0.2140 | 0.3310 |
H2O2/s | 0.2074 | 0.1081 | 0.3465 | 0.3627 |
SOD/r | 0.3359 | 0.3968 | − 0.0014 | − 0.1216 |
SOD/s | − 0.1542 | − 0.2479 | − 0.0688 | − 0.4204 |
APX/r | − 0.2164 | 0.3808 | 0.2468 | 0.4207 |
APX/s | 0.3884 | 0.2382 | 0.0025 | − 0.1544 |
Eigenvalues | 4.6986 | 2.5003 | 1.7246 | 1.3185 |
Proportion | 0.3915 | 0.2084 | 0.1437 | 0.1009 |
Cumulative (%) | 39.15 | 59.99 | 74.36 | 85.35 |