SYNTHESIS OF CHOLINE AND GLYCINE BETAINE AND ALLEVIATION OF SODIUM CHLORIDE TOXICITY
Journal Title: Indian Journal of Scientific Research - Year 2017, Vol 7, Issue 2
Abstract
The experiments were conducted to examine the effect of choline and glycine-betaine synthesized and accumulated in alfalfa plants (Medicagosativa L.) on alleviation of sodium chloride stress. Soil salinity (1.2 to 12.0 mScm-1ECe) brought about an accumulation of these osmolytes. However, they presented their net destruction upon relief of stress.Choline was found to accumulate in the range of 24.88-16.32 µ mol g-1 fresh wt. and varied to rising extentunder increasing ECe levels of sodium chloride.Glycine betaine levels were high (>64.90 µ mol g-1 fresh wt.) under 1.2 mScm-1ECe and went onincreasing gradually with rising salinity levels (4-12 mScm-1ECe). The synthesis and accumulation of both the osmolytes in shoot always exceeded roots. Discrete spots of glycine and serine as observed on thin layer chromatograms revealed that the synthesis of choline and glycine betaine could take place denovo from carbon precursor ethanol amine – a product of amino acid serine. It may be suggested that the estimated metabolic cost of glycine betaine synthesis via choline approached the cost of protein turn over. Since both these osmoprotectants mightmitigate the toxicity of sodium chloride salt, it may presumably be consistent with their adaptive value. Asearch for their synthesizing potential variability is warranted.
Authors and Affiliations
NAVNEET KRISHNAVARSHNEY
Keywords
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