title: Influence of Pseudomonas putida AF7 inoculation on soil enzymes.
abstract: There has been some concern about the environmental impact of microbial agents. Pseudomonas may be used as bioremediator and as biopesticide. In this study, we report the use of soil enzyme assays as biological indicator of possible negative effects in soil functioning after the P. putida AF7 inoculation. For that, P. putida AF7 was originally isolated from the rizosphere of rice and was inoculated on three soil types: Rhodic Hapludox (RH), Typic Hapludox (TH); and Arenic Hapludult (AH). The acid phosphatase, beta-glucosidase and protease enzymes activities were measured for three period of evaluation (7, 14 and 21 days). In general, the enzymatic activities presented variation among the tested soils. The highest activities of beta-glucosidase and acid phosphatase were observed in the RH and AH soils, while the protease activity was higher in the TH soil. Also, the soil characteristics were measured for each plot. The activity of enzymes from the carbon cycle was positively correlated with the N and the P and the enzyme from the nitrogen cycle was negatively correlated with N and C.org. The presented data indicate that soil biochemical properties can be an useful tool for use as an indicator of soil perturbations by microbial inoculation in a risk assessment.
authors: Embrapa Environment, Rodovia SP 340, km 127.5, Jaguariúna, SP, 13820-000, Brazil.
authors: Célia Maria M de Souza
authors: CM
authors: Silva
authors: Vera Lúcia S S
authors: VL
authors: de Castro
authors: Pablo Roberto
authors: PR
authors: de Oliveira
authors: Aline de Holanda Nunes
authors: Ade H
authors: Maia
mesh_terms: D000135:Acid Phosphatase / Q000378:metabolism; D004784:Environmental Monitoring / Q000379:methods*; D052918:Environmental Restoration and Remediation / Q000379:methods; D012275:Oryza / Q000382:microbiology; D010447:Peptide Hydrolases / Q000378:metabolism; D010572:Pest Control, Biological / Q000379:methods; D016958:Pseudomonas putida / Q000378:metabolism*; D018570:Risk Assessment / Q000379:methods; D012988:Soil Microbiology; D013997:Time Factors; D001617:beta-Glucosidase / Q000378:metabolism
chemical_list: D000135:Acid Phosphatase; D001617:beta-Glucosidase; D010447:Peptide Hydrolases