Does exogenous application of glycinebetaine through rooting medium alter rice (<em>Oryza sativa</em> L.) mineral nutrient status under saline conditions?
AbstractAn experiment was conducted in growth chamber to assess the role of glycinebaine (GB) in mineral nutrient status of rice (Oryza saliva L.) seedlings under saline conditions. Two rice varieties i.e. NIAB IRRI-9 and Super Basmati were grown in full strength Hoagland's nutrient solution supplied with four levels of GB i.e. Control (without GB), 5, 10 and 15 mM and three salinity treatments i.e. normal Hoagland's nutrient solution (without salt), 60 and 120 mM NaCl. Salt stress markedly reduced shoots and roots fresh and dry biomass, chlorophyll a, b and total chlorophyll contents, shoot and root K+ concentrations while shoots and roots Na+ and Cl-contents increased with increase in salinity levels. Exogenous application of GB through rooting medium did not affect shoot fresh and dry weights while root dry weight decreased by exogenously applied GB. Chlorophyll pigments and root Ca(2+) were increased while shoot and root Na+, K+ and Cl- decreased by exogenous application of GB in salt stressed plants as compared to non-stressed plants of both varieties. Overall, variety NIAB-IRR-9 was high in plant biomass production as compared to Super Basmati. Glycinebetaine ameliorated the adverse effects of salt by decreasing shoots and roots Na+. and Cl- concentrations.
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