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Rhizobium-legume symbiosis is one of the most well-established symbiotic nitrogen fixing system for agronomic studies. The current study aimed to test the hypothesis that screening for salt-tolerant rhizobial strains or salt-tolerant cultivar does not necessarily promise a salttolerant symbiotic system, as the symbiotic system is more sensitive to salt stress than the bacterium and/or the plant. In fact, the current study reveals that there is a decrease in salt tolerance of the symbiotic system by 1 dS/m , and also that there is a gradual shift in the spatial distribution of the nodules from the primary roots to the secondary roots under increased salt levels, and is time-dependant. Thus, the current study confirms that there is a need to screen for salt-tolerant symbiotic Rhizobium-legume system for producing efficient root nodules, thereby an efficient repository for nitrogen fixation.

The blend-based polymer electrolyte comprising poly(vinyl chloride) (PVC) and poly(ethylene glycol) (PEG) as host polymer and lithium bis(perfluoroethanesulfonyl)imide as complexing salt have been prepared. Ethylene carbonate and dimethyl carbonate (50:50v/v) are used as plasticizer for the system. The barium titanate is used as a filler, and the ratio of (PEG:BaTiO 3 ) is varied to study its effect on the conductivity behavior of the electrolyte. XRD and ac impedance studies are carried out on the prepared samples. The ac impedance measurements show that the conductivity of the prepared samples depends on the (PEG:BaTiO 3 ) ratio, and its value is higher for (15:5)wt.% of (PEG:BaTiO 3 )-incorporated film. The temperature dependence of the conductivity of the polymer films obeys VTF relation. The role of ferroelectric filler in enhancing the conductivity is studied. The thermal stability of the film is ascertained from TG/DTA studies. The phase morphological study reveals that the porous nature of the polymer electrolyte membranes depends on the (PEG: BaTiO 3 ) ratio.

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