FIG. 4.

Survival of different P. putida strains under greenhouse conditions. Zea mays seeds were coated with P. putida MCR8 (squares), P. putida CMC4 (diamonds), P. putida KT2440 Δasd(pBASD2, pWW0) (circles), P. putida MCR7 (triangles), or P. putida Δasd(pWW0) (inverted triangles). Coated seeds were sown in pots in which the soil was supplemented (B) (closed symbols) or not supplemented (A) (open symbols) with 3MB. The number of CFU per gram of rhizosphere soil was determined at the times indicated. Data are the averages of values from three independent counts, and the standard deviations were between 5 and 17% of the given values.