Table 2.

Comprehensive analysis of cold resistance using physiological indexes

Temperature	Cultivars	Leaf				Mean	Root			Mean
		Relative conductivity	MDA content	POD activity	CAT activity		MDA content	POD activity	CAT activity
5°C	Tianyou2	0.26 ± 0.01b	0.49 ± 0.01b	1.00 ± 0.17a	0.20 ± 0.1b	0.49 ± 0.03b	0.00 ± 0.00d	1.00 ± 0.10a	0.19 ± 0.03b	0.40 ± 0.04b
	Tianyou4	0.00 ± 0.00b	0.00 ± 0.00c	0.43 ± 0.06b	0.00 ± 0.00c	0.11 ± 0.02c	0.35 ± 0.07c	0.73 ± 0.07b	0.00 ± 0.00b	0.36 ± 0.04b
	Longyou6	1.00 ± 0.26a	0.82 ± 0.07a	0.00 ± 0.00c	1.00 ± 0.10a	0.70 ± 0.07a	1.00 ± 0.17a	0.22 ± 0.17c	0.74 ± 0.09a	0.65 ± 0.07a
	Longyou7	0.90 ± 0.20a	1.00 ± 0.26a	0.00 ± 0.00c	0.89 ± 0.12a	0.70 ± 0.07a	0.65 ± 0.09b	0.00 ± 0.00d	1.00 ± 0.26a	0.55 ± 0.12a
0°C	Tianyou2	0.00 ± 0.00c	0.24 ± 0.03b	0.00 ± 0.00d	0.14 ± 0.03c	0.09 ± 0.01c	0.36 ± 0.01c	0.36 ± 0.02c	0.23 ± 0.05c	0.32 ± 0.03b
	Tianyou4	0.37 ± 0.02b	0.00 ± 0.00c	0.18 ± 0.02c	0.00 ± 0.00d	0.14 ± 0.01c	0.00 ± 0.00d	0.00 ± 0.00d	0.00 ± 0.00d	0.00 ± 0.00c
	Longyou6	1.00 ± 0.26a	1.00 ± 0.10a	0.61 ± 0.05b	0.76 ± 0.05b	0.84 ± 0.06b	1.00 ± 0.17a	0.76 ± 0.03b	1.00 ± 0.19a	0.92 ± 0.06a
	Longyou7	0.88 ± 0.05a	0.99 ± 0.02a	1.00 ± 0.17a	1.00 ± 0.10a	0.97 ± 0.08a	0.78 ± 0.03b	1.00 ± 0.12a	0.78 ± 0.06b	0.85 ± 0.04a
−5°C	Tianyou2	0.13 ± 0.02d	0.47 ± 0.02c	0.09 ± 0.01d	0.08 ± 0.01c	0.19 ± 0.01c	0.00 ± 0.17c	0.13 ± 0.01c	0.14 ± 0.05c	0.09 ± 0.01c
	Tianyou4	0.37 ± 0.03c	0.00 ± 0.00d	0.18 ± 0.03c	0.00 ± 0.00d	0.14 ± 0.01d	0.30 ± 0.00d	0.00 ± 0.00d	0.00 ± 0.00d	0.10 ± 0.02c
	Longyou6	0.89 ± 0.02b	1.00 ± 0.11a	0.55 ± 0.04b	0.85 ± 0.03b	0.82 ± 0.05b	0.92 ± 0.05b	0.86 ± 0.08a	1.00 ± 0.19a	0.93 ± 0.03a
	Longyou7	1.00 ± 0.11a	0.80 ± 0.05b	1.00 ± 0.04a	1.00 ± 0.06a	0.95 ± 0.02a	1.00 ± 0.05a	1.00 ± 0.03b	0.65 ± 0.06b	0.88 ± 0.02b
0°C	Tianyou2	0.10 ± 0.02c	0.47 ± 0.04c	0.01 ± 0.02c	0.27 ± 0.03c	0.21 ± 0.00c	0.00 ± 0.00d	0.04 ± 0.01c	0.08 ± 0.02c	0.04 ± 0.01d
	Tianyou4	0.00 ± 0.00d	0.00 ± 0.00d	0.00 ± 0.00c	0.00 ± 0.00d	0.00 ± 0.00d	0.39 ± 0.04c	0.00 ± 0.00c	0.00 ± 0.00d	0.13 ± 001c
	Longyou6	0.76 ± 0.03b	1.00 ± 0.07a	0.38 ± 0.03b	1.00 ± 0.06a	0.79 ± 0.02b	1.00 ± 0.09a	0.59 ± 0.02b	1.00 ± 0.03a	0.86 ± 0.04a
	Longyou7	1.00 ± 0.04a	0.73 ± 0.04b	1.00 ± 0.10a	0.93 ± 0.02b	0.92 ± 0.03a	0.77 ± 0.04b	1.00 ± 0.04a	0.67 ± 0.04b	0.82 ± 0.03b
5°C	Tianyou2	0.00 ± 0.00d	0.45 ± 0.03b	0.00 ± 0.00d	0.09 ± 0.03c	0.14 ± 0.01c	0.26 ± 0.04b	1.00 ± 0.01a	0.00 ± 0.00c	0.42 ± 0.02b
	Tianyou4	0.23 ± 0.03c	0.00 ± 0.00c	0.30 ± 0.03c	0.00 ± 0.00d	0.13 ± 0.01c	0.00 ± 0.00d	0.42 ± 0.03b	0.01 ± 0.00c	0.14 ± 0.01c
	Longyou6	0.69 ± 0.02b	0.97 ± 0.02a	0.54 ± 0.03b	1.00 ± 0.09a	0.80 ± 0.01b	0.17 ± 0.01c	0.00 ± 0.00d	1.00 ± 0.10a	0.39 ± 0.04b
	Longyou7	1.00 ± 0.05a	1.00 ± 0.03a	1.00 ± 0.07a	0.85 ± 0.03b	0.96 ± 0.01a	1.00 ± 0.08a	0.35 ± 0.04c	0.61 ± 0.04b	0.65 ± 0.04a

The data for Relative conductivity, MDA, POD, and CAT are subordinate value of each indicator. Mean is comprehensive evaluation value of each cultivar.