Table 3.

PCA based on the HSTCs of the growth and leaf physiological indices of 15 blueberry seedling cultivars under high soil pH stress.

Trait	Component
	1	2	3	4	5
Plant height	0.643	0.260	0.478	0.017	0.371
Main stem diameter	0.561	-0.083	0.596	-0.351	-0.046
Crown width	0.923	0.122	0.069	-0.016	-0.137
Leaf length	0.947	-0.033	0.025	0.089	0.023
Leaf width	0.810	0.059	-0.122	0.336	0.063
Leaf thickness	0.070	0.026	-0.174	-0.437	0.624
Soluble protein (SP)	-0.563	0.523	0.186	0.044	-0.175
Soluble sugar (SS)	-0.039	0.188	0.212	0.825	-0.125
Malondialdehyde (MDA)	0.032	-0.025	-0.905	-0.077	0.192
Catalase (CAT)	0.292	-0.106	-0.443	0.517	-0.131
Superoxide dismutase (SOD)	-0.025	-0.003	0.015	0.204	0.888
Chlorophyll relative content (SPAD)	0.216	0.134	-0.076	0.832	0.296
Net photosynthetic rate (Pn)	0.112	0.767	-0.491	-0.129	-0.178
Transpiration rate (E)	0.033	0.960	0.165	0.181	0.075
Intercellular CO2 concentration (Ci)	0.093	0.540	0.735	0.154	0.055
Stomatal conductance (Gs)	0.049	0.955	0.189	0.135	0.115
Eigenvalues	3.615	3.146	2.580	2.216	1.583
% of Variance	22.593	19.660	16.123	13.853	9.891
Cumulative %	22.593	42.253	58.375	72.228	82.120

Bold numbers indicate eigenvalues are significant ≥|0.5|.