FIG. 1.

Population dynamics of WCS358r (○), its PCA- and DAPG-producing derivatives WCS358r::phz (⋄) and WCS358r::phl (□), and a combination of the two derivatives (▴) in the wheat rhizosphere in 1999 (A) and 2000 (B). The numbers of CFU were determined on KB⁺rif. An asterisk indicates that there was a significant difference between the parent strain and WCS358r::phz, WCS358r::phl, or a mixture of the two GMMs 11 days after sowing (P = 0.028, P = 0.049, and P = 0.004, respectively) and between the parent strain and WCS358r::phz 39 days after sowing in 2000 (P = 0.018). The number sign indicates the number of CFU per seed at the beginning of the field experiment.