Table 6.

Eigen values, relative and cumulative proportion of total variance, and correlation coefficients for growth parameters, mineral profile, nutritional and functional traits of Salanova butterhead lettuce with respect to the three principal components.

Principal components	PC1	PC2	PC3
Eigen value	11.7	5.3	1.8
Percentage of variance	51.1	23.4	8.2
Cumulative variance	51.1	74.5	82.7
Eigen vectorsa
Lutein	0.957	0.160	0.168
β-Cryptoxanthin	0.956	0.156	0.148
Violaxanthin + neoxanthin	0.954	0.057	0.240
Mg	0.889	0.101	0.363
Anthocyanins	0.882	0.370	−0.044
Ca	−0.858	0.154	0.236
Caffeoyl-meso-tartaric acid	0.858	0.315	−0.113
Nitrate	−0.855	0.198	0.362
β-carotene	0.850	0.410	−0.049
Caffeoyl-tartaric acid	−0.790	0.109	−0.024
Shoot biomass	-0.781	0.300	−0.007
Chlorogenic acid	0.781	0.452	−0.206
LN	−0.724	−0.219	−0.347
Sulphate	0.697	−0.657	0.108
Phosphate	−0.374	0.860	0.187
DM	−0.399	−0.820	−0.293
Fresh yield	−0.323	0.808	0.216
Se	0.440	−0.755	−0.187
Chicoric acid	0.019	0.672	−0.374
Total phenolics	0.535	0.609	−0.298
LA	−0.540	0.571	−0.218
K	−0.608	0.139	0.676
Na	0.359	−0.507	0.586

^aBoldface factor loadings are considered highly weighed.

^bLN, leaf number; DM, dry matter; LA, leaf area.