Physiological response of rice (oryza sativa L.) genotypes under different salinity levels at early seedling stage

Salinity is one of the major threats facing the cultivation of field crops. The response of six rice (Oryza sativus L.) genotypes to different sodium chloride levels; 0, 40, 60, 80 and100 mM were investigated at early seedling stages. Among the tested genotypes IR 66946-3 R-178-1-1 and IR 84675-58-4-1-B-B are the tolerant genotypes had the potential to perform better under saline conditions, whereas, Sarshar was moderate tolerant under saline conditions. Moreover, the genotypes i.e. IR 84675-7-3-2-B-B and IR 84675-25-7-3-B-B are the moderate sensitive under salinity, subsequently, the genotype HHZ5-SAL10-DT2-DT1 showed sensitive under saline environment. Furthermore it is concluded that the rice genotypes adjust their osmotic potential by accumulating both types of solutes (organic and inorganic ions), and their better performance might be correlated to the selective uptake of K + over Na + and high accumulation of proline.