تأثير الإجهاد الملحي على النمو و صبغات البناء الضوئي لصنفين من الشعير Hordeum vulgare (L.)‎

الملخص EN

This study has proposed a comparison between the morphological and physiological responses of two varieties of barley, due to the concentration of salts (salinity), in order to study the physiological basis for stress tolerance and define the physiological and biochemical factors, which determine the variations arising from the stress process.

The general trend of salt stress has demonstrated a gradual increase in leaf area and the fresh weight of variety Giza 123 at low salt concentrations thereafter this increase has reached its peak at the concentration of 240 mM.

However this trend has reversed to decrease when the concentration increased.

Whereas, in variety Giza 124 the relationship of salt concentration has been inversely proportional to the stated measurements, decreasing percentage was concomitant with increasing concentration.

The same trend has also appeared to the dry weight since the inhibiting effect has been directly proportional with increasing concentration in contrarily to variety Giza 123.

Whereby, the dry weight increase had been highly significant with all concentrations, whereas the peak value was at concentration 240 mM.

Less pronounced effects of salt stress were observed in variety Giza 123 since it has been harmed, only, by high concentrations of sodium chloride, while the lower concentrations have been activating growth.

Whereas, var.

Giza 124 has been affected by all the concentrations used and as with the increase of salt concentration.

This leads to the conclusion that var.

Giza 123 is more salt tolerant than the other variety.