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Evaluation of quaternary ammonium compounds as index of salt tolerance using rice cultivars

Evaluation of quaternary ammonium compounds as index of salt tolerance using rice cultivars

Indian Journal of Experimental Biology 26(2): 137-139

Nature and concentration of glycinebetaine and total quaternary ammonium compounds (QAC) in five cultivars of rice representing a spectrum of salt sensitivities under NaCl-stressed (100 mM NaCl resulting in an increase in the EC value of 9.35 m mhos/cm) conditions was studied during different stages of seedling growth by solution culture experiments. Salt tolerant cultivars Co 43 and CSC 1 exhibited higher magnitude of increase in glycinebetaine and total QAC in their shoot and root systems than the salt sensitive cultivars CSC 2, TKM 4 and TKM 9 during seedling stages. The data suggest that naturally occurring quaternary ammonium compounds, particularly glycinebetaine, may be used as a cumulative stress index for evaluation of salt tolerant rice cultivars. The possible role of glycinebetaine in salt tolerance is discussed.

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