Fig. 3

Colonization of Arabidopsis plants by selected bacteria. Plants were inoculated with each strain of selected bacteria by immersing the root tip of 7-day-old seedlings in bacterial cell culture solution, followed by cultivation for 7 days. After extracts of surface-sterilized plants were plated on medium, the number of colonies that formed on the plate was determined. No colonies were formed for plants that received mock treatment (only medium) instead of bacterial cell culture solution. Average values ± SE from three independent experiments are presented