Fig 4. Survival rate of Zm6-ndh in mixed platings with Zm6, after 8 hours of mixed or separate incubation of strains in phosphate buffer with periodical glucose feed.

Inset—colony counts of separately incubated Zm6 and Zm6-ndh, with periodical glucose addition (empty bars), or without glucose addition (filled bars). Data represent mean values of 5 (mixed platings with separate incubation), 8 (mixed incubation), or 6 (inset; separate platings) independent experiments; error bars represent SD. The P value of the difference between the results of separate and mixed incubations was found to be 0.007. The P value of the difference between colony counts of separately incubated Zm6 and Zm6-ndh with periodical glucose addition was 0.027.