Table 1.

Stomatal density (number mm⁻²), number of opened, closed stomata (number mm⁻²), and stomatal aperture length (μm) on adaxial and abaxial surfaces of date palm leaves grown in vitro after four weeks of PEG hardening treatment.

PEG g L−1	Adaxial Surface				Abaxial Surface
	Density	Opened	Closed	Aperture Length	Density	Opened	Closed	Aperture Length
0.0	140.6	133.74 a	6.82 d	13.67 a	159.5	150.9 a	8.54 c	14.67 a
10	140.6	101.2 b	39.40 c	10.74 ab	154.4	114.9 b	39.42 b	11.32 b
20	138.9	75.46 c	63.42 b	9.54 bc	145.8	99.46 c	46.26 b	10.45 b
30	149.4	41.10 d	108.1 a	7.36 c	151.4	51.42 d	89.18 a	7.77 c
LSD0.05	NS	15.29	20.93	3.30	NS	14.78	16.46	1.305

Means followed by different letters are significantly different at p ≤ 0.05 according to least significant difference (LSD) test.