Effects of LED photoperiods and light qualities on in vitro growth and chlorophyll fluorescence of Cunninghamia lanceolata

Table 5 Rotated component matrix of PCA

Factor	Principal components
Factor	PC1	PC2	PC3	PC4
Plant height	0.743	0.205	−0.516	0.213
Dry weight	0.020	0.024	−0.780	0.423
Rooting rate	0.849	0.383	−0.051	0.161
Average root	0.829	0.293	−0.158	− 0.248
Root length	0.939	0.002	−0.159	−0.198
Root surface area	0.931	0.044	−0.096	−0.237
Root volume	0.885	0.262	−0.242	0.067
Chlorophyll a	0.653	−0.643	0.318	0.210
Chlorophyll b	0.598	−0.663	0.394	0.181
Total chlorophyll	0.665	−0.688	0.049	0.209
Chlorophyll a/b	0.637	−0.650	0.343	0.201
Fv/Fo	−0.235	0.751	0.330	0.453
Fv/Fm	−0.474	0.560	0.448	0.300
Y(II)	0.431	0.731	0.300	−0.319
qP	0.700	0.257	0.575	−0.077
NPQ/4	−0.380	−0.478	− 0.020	−0.473
ETR_II	0.605	0.757	0.137	−0.003
Characteristic root	8.396	1.147	0.872	0.863
Contribution rate	44.642%	25.747%	12.479%	7.059%
Cumulative contribution rate	89.927%

ISSN: 1471-2229