Figure 2.

Effect of Bacillus megaterium on growth and development of wild-type Arabidopsis (Col-0) and cre1-12/ahk2-2tk/ahk3-3 triple cytokinin receptor mutant. (A) Arabidopsis (Col-0) plants grown on the surface of agar plates with 0.2x Murashige and Skoog (MS) medium. (B) Arabidopsis plants that were inoculated with B. megaterium at a distance of 5 cm from the root tip 5 days after germination and grown for a further 6-day period. (C) cre1-12/ahk2-2tk/ahk3-3 seedlings uninoculated, (D) inoculated at 5 cm or (E) 2 cm from the primary root tip. Note the elicitation of growth by bacterial inoculation and the formation of branched root systems in WT plants. These effects were absent in the triple cytokinin receptor mutants. Photographs are representative individuals from four plates per treatment.