Table 4.
Correlation coefficients for the quality traits of the 3 first principal components, eigenvalue, and the relative and cumulative proportions of the total variance explained by these components, in 11 lettuce varieties evaluated in 3 development stages (microgreen, baby, adult). DW: Dry weight; Chl: Chlorophylls; Car: Carotenoids; Ant: Anthocyanins; AsA: Ascorbic Acid; Phe: Phenols; DPPH: Antioxidant capacity; Ca: Calcium; K: Potassium; Fe: Iron.
| First PC | Second PC | Third PC | |
|---|---|---|---|
| Microgreen | |||
| DW | 0.355 | −0.230 | |
| Chl a + b | 0.203 | −0.557 | |
| Car | 0.334 | −0.294 | 0.213 |
| Ant | −0.665 | ||
| AsA | 0.419 | ||
| Phe | 0.366 | 0.352 | |
| DPPH | 0.373 | 0.346 | |
| Ca | 0.270 | 0.653 | |
| K | −0.409 | −0.182 | |
| Fe | 0.295 | 0.435 | |
| Eigenvalue | 4.70 | 2.28 | 1.35 |
| Variance explained (%) | 46.99 | 22.80 | 13.49 |
| Cumulative variance explained (%) | 46.99 | 69.79 | 83.28 |
| Baby | |||
| DW | 0.201 | −0.471 | |
| Chl a + b | 0.292 | 0.509 | |
| Car | 0.459 | 0.221 | |
| Ant | 0.335 | −0.545 | |
| AsA | 0.510 | ||
| Phe | 0.413 | 0.167 | 0.180 |
| DPPH | 0.284 | −0.269 | −0.466 |
| Ca | 0.403 | 0.292 | |
| K | 0.553 | −0.153 | |
| Fe | 0.169 | 0.436 | −0.179 |
| Eigenvalue | 3.46 | 2.64 | 1.39 |
| Variance explained (%) | 34.60 | 26.43 | 13.90 |
| Cumulative variance explained (%) | 34.60 | 61.02 | 74.93 |
| Adult | |||
| DW | 0.328 | −0.326 | |
| Chl a + b | −0.360 | ||
| Car | 0.593 | −0.415 | |
| Ant | 0.331 | −0.270 | 0.242 |
| AsA | 0.396 | 0.157 | |
| Phe | 0.369 | 0.334 | |
| DPPH | 0.406 | ||
| Ca | 0.248 | −0.428 | −0.218 |
| K | 0.388 | 0.718 | |
| Fe | 0.313 | −0.289 | 0.283 |
| Eigenvalue | 5.09 | 1.44 | 1.07 |
| Variance explained (%) | 50.88 | 14.40 | 10.73 |
| Cumulative variance explained (%) | 50.88 | 65.27 | 76.00 |