TABLE 1.

Tissue structure parameters of fresh tobacco leaves treated with different salicylic acid concentration.

Treatment	Thickness of upper epidermis (μm)	Palisade tissue thickness (μm)	Sponge tissue thickness (μm)	Thickness of lower epidermis (μm)	Blade thickness (μm)	Palisade tissue thickness/sponge tissue thickness (μm)
Control	12.54B	62.72B	80.29C	10.75B	166.31C	0.78A
SA-1	30.88A	174.26A	176.72A	22.16A	404.03A	0.99A
SA-2	32.32A	149.8A	141.46B	24.59A	348.17B	1.06A

Different capital letters indicate significant differences between treatments at the same stage (P < 0.05) (n = 3).