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Rhizosphere colonization by pJP4-carrying SPR044 and its derivatives in competition with other bacteria. The log CFU values for SPR044 and its derivatives retrieved from the rhizosphere at different times divided by the log CFU values for the coinoculated strain are shown. The results are the averages for at least four coinoculation experiments with P. fluorescens WCS417r. Differences between means for the same cycle labeled with the same letter are not statistically significant.
