Table 1 Effect of triacontanol on leaf gas attributes of four cucumber genotypes under normal and salt stress conditions.

Stomatal conductance (μmol m⁻² s⁻¹)

Photosynthesis rate (μmol m⁻² s⁻¹)

Control

5.25 ± 0.21cd

5.49 ± 0.21bc

5.27 ± 0.19de

5.56 ± 0.29bc

3.57 ± 0.03bc

3.81 ± 0.05bc

3.27 ± 0.23cd

3.72 ± 0.07bc

Salinity (50 mmol L⁻¹)

3.87 ± 0.20fg

4.27 ± 0.13gh

2.66 ± 0.10j

2.90 ± 0.34ij

2.79 ± 0.027def

2.82 ± 0.13de

1.90 ± 0.02g

2.09 ± 0.03ef

Triacontanol spray + non-saline

5.90 ± 0.21ab

6.07 ± 0.22a

5.74 ± 0.18bc

6.13 ± 0.27abc

4.12 ± 0.11ab

4.52 ± 0.18a

3.68 ± 0.10bc

4.22 ± 0.23ab

Triacontanol spray + salinity

4.56 ± 0.22de

4.64 ± 0.12ef

3.65 ± 0.38hi

3.74 ± 0.45gh

3.21 ± 0.11cd

3.28 ± 0.23cd

2.36 ± 0.04efg

2.81 ± 0.24de

Transpiration rate (mmol H₂O m⁻² s⁻¹)

Water use efficiency (Pn/E)

Control

2.64 ± 0.02abc

2.78 ± 0.03abc

2.64 ± 0.05abc

2.86 ± 0.01abc

1.65 ± 0.04ab

1.52 ± 0.04ab

1.31 ± 0.04b

1.37 ± 0.05b

Salinity (50 mmol L⁻¹)

2.04 ± 0.12cde

2.04 ± 0.15def

1.59 ± 0.16ef

1.67 ± 0.24f

1.29 ± 0.09b

1.34 ± 0.11ab

0.92 ± 0.12b

0.94 ± 0.20b

Triacontanol spray + non-saline

2.90 ± 0.23abc

3.1 ± 0.29ab

2.86 ± 0.14abc

3.20 ± 0.15a

1.68 ± 0.07a

1.47 ± 0.22ab

1.36 ± 0.05ab

1.22 ± 0.07b

Triacontanol spray + salinity

2.4 ± 0.06bcd

2.49 ± 0.13abcd

2.14 ± 0.12cdef

2.17 ± 0.20cde

1.35 ± 0.02ab

1.29 ± 0.08b

1.09 ± 0.06b

1.20 ± 0.11b