FIG. 4.

Coinoculation of potato tubers with wild-type strain 3937 and outS strain A3144 (hatched bars), msrA strain RH7006 (gray bars), or opgG strain NFB3500 (black bars). Mixed bacteria (10⁷) were inoculated into holes in potato tubers. After 72 h, macerated tissue was collected, weighed, and diluted in physiological distilled water. The percent mutant bacteria was determined by the ratio of the number of mutant bacteria (Kan^r) to the number of total bacteria per gram of tissue. The results reported are averages of three independent experiments performed on at least two potato tubers.