EF.FECT OF SALINITY ON MINERAL CONTENT IN DIFFERENT PLANT PARTS OF RICE GENOTYPES

Abstract

The effect of salinity on mineral content in stem, leaf sheath, leaf blade and grain of rice genotypes differing in salt tolerant (The genotypes PVSBI9, PVSB9. PNR519. PNR381. Iratom24 and Pokkali representing salt tolerant and NS 15 representing salt-sensitive) were studied in an experiment conducted in two factors Completely Randomized Design. The susceptible genotype NS 15 showed higher concentration of Na', Cl, Ca" and Mg ' and lower amount of K' in stem, leaf sheath and leaf blade of rice compared to tolerant ones. The concentration of Na', Ca". Mg" and Cl followed an increasing pattern in different plant parts of all the selected rice genotypes due to increasing salinity levels except Cal+ and Mgl' in grain, where these two ions decreased with increasing salinity levels. But the concentration of K' showed decreasing pattern in stem, leaf sheath, leaf blade and grain with increasing salinity levels. In different plant parts, the Na+ and cr content increased very sharply and K' decreased very rapidly in susceptible genotype as compared to other genotypes. The highest amount of Na+ and K' were obtained in stem followed by leaf sheath, leaf blade and grain at different salinity levels. But the content of Cal+, MgH and CT were high in leaf blade followed by leaf sheath and stem at different levels of salinity.