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Abstract

Salinity is the main limiting factor that adversely affecting germination, growth and yield of wheat in Egypt and Libya. A lab experiment was conducted in the seed lab, Agronomy Dept., Faculty of Agric., Mansoura University, Egypt during November and December 2016. The results clearly revealed that the high germination stress tolerance and root fresh stress indices obtained from Misr 1 cultivar. Meanwhile, the highest shoot length stress index from Misr 2 cultivar. The highest root length stress index, shoot fresh stress index, shoot dry stress index and root dry stress index recorded from Gemmiza 12 cultivar. The results indicated the highest stress tolerance index and shoot length stress index produced from which soaking, as pretreatment, in Ascorbic acid. These results have indicated that the highest stress tolerance index, root fresh stress index, shoot dry stress index and root dry stress index from the control treatments. Gradual increases in salinity concentrations from 40 mM to 160 mM significantly reduced germination stress tolerance, shoot and root length stress, shoot and root fresh stress, shoot and root dry stress indices. The highest percentages of germination stress tolerance, shoot length stress root length stress, shoot fresh stress, root fresh stress, shoot dry stress and root dry stress indices obtained from a salinity level of 40 mM. It could summarized that to enhance physiological indices; it could be optional to soak Gemmiza 12 or Misr 1 cultivars in Ascorbic acid at a concentration of 200 ppm for 12 h under salinity stress.

Comparative Effect of Salinity on Antioxidant Enzymes of Two Wheat Genotypes by Foliar Application of Salicylic Acid and Potassium

“…In this situation, salinity tolerance of crop plant for future food supply is required for sufficient food supply to growing population. Salinity limits the crop productivity by affecting many physiological and biochemical processes such as mineral deficiencies, ion toxicity and osmotic stress [1][2]. Various enzymatic activities and plant metabolism are affected due to such disturbances [3][4].…”