Abstract
Living systems respond to changing environment by changing gene expression. In addition to changes in the level of expression of existing proteins, some new proteins may be synthesized. Such proteins not only can serve as markers, but may also play important role in adjusting to that specific environment. Targeting of these proteins to specific location within or outside the cell may also yield important clues to their function. In such a pursuit, ten days old seedlings of a relatively salt tolerant rice variety grown on MS medium were treated with 2% sodium chloride for three days. Root were harvested, ground, and fractionated in to sub-cellular components. Microsomes were further fractionated into constituent membranes. Proteins from these fractions were analyzed by SDS-PAGE and/or two dimensional separations. Results show induction of two new polypeptides which were present in total protein extract and soluble fractions. All other fractions failed to reveal induction of any new peptide under experimental conditions used. Key words: 2-D electrophoresis, fractionation, salt induced proteins, sub-cellular localization.
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