The aims of this study were to evaluate whether rhizobacteria with hydroponic lettuce plants and 17 bacterial isolates. The experimental isolates of the fluorescent group of the genus Pseudomonas: 1) units received Pseudomonas spp. isolate suspension and, one week later, produce metabolites involved in growth promotion (AIA and HCN); P. aphanidermatum zoospore suspension. The plants were evaluated for 2) have the potential for the biological control of Pythium root darkening and shoot and root dry matter mass. The isolates produce aphanidermatum; 3) promote the growth of lettuce cultivated in metabolites which benefit the growth of lettuce even in the presence of hydroponic system; 4) show correspondence in the in vitro and in vivo the pathogen. The isolates LP15, LP25, LP28, LP44 and LP47 reduced interactions. Thus, Petri dishes containing agar-water culture medium, the damage caused by P. aphanidermatum in experiments in vitro and in with or without Pythium aphanidermatum, received pre-germinated vivo. This is the first study which demonstrated that rhizobacteria seeds of lettuce treated with the rhizobacteria isolates. The lengths of obtained from Brazilian soils have the potential to promote the the hypocotyl and radicle were measured at five or seven days after biological control of P. aphanidermatum and the growth of lettuce incubation at 28 ºC. Two experiments were carried out in a greenhouse plants in hydroponic systems.
Pseudomonas; Pythium aphanidermatum; protected cultivation
