Table 3.

Effects of exogenous melatonin on the stomatal characteristics under salt stress.

Treatment	Stomatal length (μm)	Stomatal width (μm)	Stomatal aperture (μm)	Stomatal number
CK	32.49 ± 1.68 a	21.64 ± 1.33 a	4.39 ± 0.84 a	8.40 ± 0.49 c
S	27.09 ± 1.49 c	16.98 ± 0.95 c	2.54 ± 0.25 b	16.20 ± 1.17 a
S + MT200	29.72 ± 1.13 b	19.64 ± 1.09 b	4.98 ± 0.32 a	12.40 ± 0.49 b

The stomata length, width, pore diameter and number of cotton seedlings under different treatments. Control (CK) and salt-treated (S) plants were sprayed with distilled water, while S + MT200 was sprayed with 200 μM MT. Different lowercase letters indicate significant differences at the p ≤ 0.05 level