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RESEARCH ARTICLE

Comparison of plant growth-promoting rhizobacteria in a pine forest soil and an agricultural soil

Víctor M. Flores-Núñez A , Enriqueta Amora-Lazcano A , Angélica Rodríguez-Dorantes B , Juan A. Cruz-Maya C and Janet Jan-Roblero A D
+ Author Affiliations
- Author Affiliations

A Departamento de Microbiología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala s/n. Col. Sto. Tomás, Ciudad de México, 11340, México.

B Departamento de Botánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala s/n. Col. Sto. Tomás, Ciudad de México, 11340, México.

C Unidad Profesional Interdisciplinaria en Ingeniería y Tecnologías Avanzadas, Instituto Politécnico Nacional, Av. IPN 2580, Col. La Laguna Ticoman, Ciudad de México, 07340, México.

D Corresponding author. Email: jjan_r@yahoo.com.mx

Soil Research 56(4) 346-355 https://doi.org/10.1071/SR17227
Submitted: 26 August 2017  Accepted: 26 November 2017   Published: 10 April 2018

Abstract

The load and diversity of plant growth-promoting rhizobacteria (PGPR) are used as biomarkers to evaluate the health and quality of the soil. In the present study, the diversity of PGPRs and the physicochemical properties of the soil 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 investigate the effects of land use change. Bacterial diversity and physicochemical properties differed between the two soils. In the pine forest soil, PGPR were distributed at similar proportions in the Proteobacteria (29.41%), Actinobacteria (29.41%) and Firmicutes (35.29%) phyla, whereas the remaining PGPR were in Bacteroidetes (5.88%). In the agricultural soil, most PGPR belonged to the Phylum Firmicutes (50%), with the remaining belonging to Proteobacteria (22.73%), Actinobacteria (18.18%) and Bacteroidetes (9.09%). Percentages of bacteria producing indole acetic acid (90.91%) and siderophores (40.91%) were higher in agricultural soil. A canonical correspondence analysis (CCA) was used to correlate PGPR with the physicochemical characteristics of the soils. The CCA revealed that differences between both soils and the physicochemical properties of the 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 and a pine forest soil.

Additional keywords: canonical coordinate analysis, physicochemical properties.


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