Fig. 4. Effect of 0.6% NaHCO3 on the membrane integrity of P. expansum spores. (a) Spore were cultured at 25◦C in PDB medium supplement with 0 or 0.6% NaHCO3. After 6 hof incubation, spore were stained with the PI and observed with a fluorescence microscope. (b)The percentage of spores stained with PI were shown in the line chart after incubation for the indicated times. Bars represent standard deviation of the treatment means of pooled data.