Table 4.

Results of principal component analysis.

Principal component	Resistance rate (%)						Accumulative contribution rate (%)
	POD	APX	CAT	SOD	β-1,3-glucanase	MDA
1	0.963	0.887	0.768	0.478	0.040	0.051	42.854
2	0.050	-0.349	0.456	0.126	0.952	-0.027	63.378
3	-0.065	-0.060	0.118	0.182	-0.035	0.981	80.177

POD, peroxidase; APX, ascorbate peroxidase; CAT, catalase; SOD, superoxide dismutase; MDA, malonaldehyde.