0.05.3.3. NaHCO3damages plasma membrane integrity of P.expansum spores.Propidium iodide (PI), a, fluorescent molecule is membrane impermeable and can bind to DNA by intercalating between thebases. With little or no sequence preference. Therefore PI canbe, used to evaluate the plasma membrane integrity. In Fig. 4 a some,, NaHCO3-treated P. Expansum spores released strong red fluorescence in fluorescence field which indicated, that the plasma. Membranes of these spores were markedly damaged and the cellsbecame permeable to the membrane-impermeant dye PI. The number. Of stained spores increased as the extension of incubation time.
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