Abstract
Rifampicin-resistant mutants of two plant-growth-promoting rhizosphere bacteria, Pseudomonas fluorescens strain PsIA12 and the associative, non-symbiotic Rhizobium leguminosarum bv. trifolii strain R39, were inoculated with different crops in field experiments. Soil from these sites was collected after harvest. Non-inoculated maize, pea, lupine and two weeds (Amaranthus retroflexus, Echinochloa crus-galli) were subsequently grown in this soil in the greenhouse and tested for colonization with Pseudomonas strain PsIA12 and Rhizobium strain R39. The Rhizobium strain was able to re-establish in the rhizosphere of the plants without nodulation in between, even after dry storage of the soil up to 12 months. It could even colonize a second subsequent plant generation. Highest cell numbers were detected in legumes (mean value log 5.0 cfu · g root -1), followed by maize (log 4.3 cfu · g root -1) and the weeds (< log 4.2 cfu · g root -1). Rhizosphere colonization was modified by the inoculated precrop. The Pseudomonas strain was not able to re-establish cell numbers higher log 3.0 cfu · g root -1 in the rhizosphere.
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