Effect of persoaking guar seeds in some plant vitamins or phytohormones on germination and seedling growth in the presence of nacl

The present experiment is planned as an attempt to minimize the harmful effects of NaCl salinity(2500, 5000 and 7500 ppm)  on germination percentage (GP %) and seedlings growth (fresh and dry weight as well as seedling length)of guar,  through presoaking seeds in selected phytohormones (ABA or SA) and vitamins (AsA or Thi) at 50 and 100ppm for each. The low level of NaCl increased significantly guar seed germination percentage and seedling growth ,whereas that increasing salinity levels up to 5000ppm decreased seed germination percentage as well as seedling growth and this effect increased consistently and rapidly with increasing NaCl salinity as compared to non-salinized (control). The great reduction occurred under high salinity levels (7500 ppm NaCl). In most cases, presoaking seeds with selected material had a significant effect on seed germination as well as seedling growth under both normal and NaCl saline conditions compared to control except ABA at 100ppm with high salinity levels. On the other hand, under normal conditions, maximum germination was achieved in seeds presoaked with AsA at both level and Thi or SA at 100 ppm .Generally, phytohormone (SA) and plant vitamin (AsAorThi) counteracted the harmful effect of salinity on guar seedling growth against different salinity levels. These results suggested that AsA presoaking alleviate the adverse effects of NaCl presoaking guar seeds salinity on the seed germination and seedling growth of the guar followed by SA over the non- presoaking treatment.