Table 9.

Principal component analysis of polyphenolic compounds concentration evaluated under non-stress and stress conditions.

Variable	Eigenvectors
	Non-stress				Stress
	PC1	PC2	PC3	PC4	PC1	PC2	PC3	PC4
dba	0.38	-0.03	-0.03	0.00	0.38	0.00	0.01	0.00
caf	0.38	-0.03	-0.03	0.00	0.38	0.00	0.01	0.00
chl	0.38	-0.03	-0.03	0.00	0.38	0.00	0.01	0.00
gal	0.38	-0.03	-0.03	0.00	0.38	0.00	0.01	0.00
syr	0.38	-0.03	-0.03	0.00	0.38	0.00	0.01	0.00
pca	0.38	-0.03	-0.03	0.00	0.38	0.00	0.01	0.00
van	0.38	-0.03	-0.03	0.00	0.38	0.00	0.01	0.00
que	0.06	0.70	0.12	0.70	-0.02	0.61	0.38	-0.70
rut	0.08	0.70	0.08	-0.71	-0.01	0.62	0.33	0.72
dpph	0.07	-0.15	0.99	-0.02	-0.03	-0.50	0.86	0.04
Eigenvalue	7.09	1.96	0.94	0.01	7.01	2.46	0.51	0.02
Difference	5.13	1.01	0.93	0.01	4.54	1.96	0.48	0.02
Proportion	70.87	19.58	9.44	0.10	70.08	24.65	5.05	0.22
Cumulative	70.87	90.46	99.90	100.00	70.08	94.73	99.78	100.00

dba = 2, 5-dihroxybenzoic acid, caf = caffeic acid, gal = gallic acid, chl = chlorogenic acid, pca = p-coumeric acid, syr = syringic acid, van = vanilic acid, que = quercetin, rut = rutin.