This article has been peer reviewed and accepted for publication. It is in production and has not been edited, so may differ from the final published form.
Comparison of plant growth-promoting rhizobacteria (PGPR) in a pine forest and an agricultural soil
The load and diversity of plant growth promoting rhizobacteria (PGPR) are used as biomarkers to evaluate the health and quality of the soil. In this study, diversity of PGPRs and the physicochemical properties were used as comparative biomarkers in two adjacent soils (a pine forest soil and an agricultural soil) of the same region in Mexico City, in order to observe the effect of land use change. Bacterial diversity and physicochemical properties were different between both soils. In the pine forest soil, PGPR were distributed at the same proportion in the phylum Proteobacteria (29.41%), Actinobacteria (29.41%) and Firmicutes (35.29%), and the remaining in Bacteroidetes (5.88%); whereas in the agricultural soil, the majority of PGPR belonged to the phylum Firmicutes (50%) and the remaining percentage to Proteobacteria (22.73%), Actinobacteria (18.18%) and Bacteriodetes (9.09%). Bacteria producing indole acetic acid (90.91%) and siderophores (40.91%) were higher in agricultural soil. A canonical coordinate analysis (CCA) was used to correlate PGPR and physicochemical characteristics of the soils. The CCA determined differences between both soils and the physicochemical properties of soils affected isolated bacterial species and their distribution. These results demonstrate that the PGPR are correlated with the physicochemical properties of the soil exhibiting differences between an agricultural soil from a pine forest soil.
SR17227 Accepted 26 November 2017
© CSIRO 2017