Table 3.

Effects of exogenous spermidine (Spd) on the transcript level of sod1, cevi16, and cat1 in citrus seedling leaves under high-temperature stress

Treatment	sod1 relative expression	cevi16 relative expression	cat1 relative expression
CK	5.34 ± 0.03d	1.46 ± 0.02d	1.84 ± 0.02d
Spd	5.88 ± 0.02 c	1.73 ± 0.02c	2.03 ± 0.01c
HT	6.73 ± 0.04b	2.32 ± 0.01b	3.32 ± 0.04b
Spd + HT	8.05 ± 0.03a	2.96 ± 0.03a	4.92 ± 0.01a

Note: For each variable, different lowercase letters indicate statistically significant by Duncan multiple- range test at P < 0.05. Data were expressed as the mean ± standard error of three independent biological replicates. Key: sod1 – superoxide dismutase 1 gene, cevi16 – peroxidase gene, cat1 – catalase 1 gene.