Table 20. Effect of 100 mM NaCl with or without glutathione, ascorbic acid, or amino acid mixture on photosynthetic efficiency of two barley cultivars at the preflowering stage.

Treatments	Photosynthetic efficiency
	G124	G119
Control	0.76±0.0	0.74±0.0
NaCl	0.75±0.0	0.73±0.0
Glutathione	0.76±0.0	0.75±0.0
Glutathione plus salt	0.77±0.0	0.75±0.0
Ascorbic acid	0.76±0.0	0.75±0.0
Ascorbic acid plus salt	0.76±0.0	0.75±0.0
Amino acid mixtures	0.78±0.0	0.74±0.0
Amino acids plus salt	0.76±0.0	0.75±0.0
F	22.66	45.14
P	**	**
LSD	6.11	3.53

^**Highly significant at P≤0.01.