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(A) Leaf disc assay for chlorophyll loss in WT and transgenic lines after 150 mM NaCl treatment and (B) Chlorophyll estimation after leaf disc assay with WT and TopoII over-expressing tobacco transgenic lines under salinity stress condition. Bars represent means and standard errors (n = 3) and those noted with same letters are not significantly different at P < 0.05 by Tukey's test.
