Deciphering the Structural and Functional Diversity of Rhizobacteria from Stone Pine Inoculated with Plant Growth Promoting Rhizobacteria (PGPR) before and after Transplanted into Degraded Agricultural Soil

The use of plant growth-promoting rhizobacteria (PGPR) inoculated on plants has shown that it can increase the success of reforestation and accelerate soil recovery by improving soil microbial diversity. Three PGPR isolated from natural pine populations were selected for their metabolic capabilities...

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Bibliographic Details
Published in:Soil systems 2024-06, Vol.8 (2), p.39
Main Authors: Garcia-Villaraco, Ana, Ramos Solano, Beatriz, Gutierrez-Mañero, Francisco Javier, Lucas, José Antonio
Format: Article
Language:English
Subjects:
Agricultural land
Bacteria
Biodiversity
Biological diversity
Chitinase
degraded soils
Discriminant analysis
Environmental impact
functional diversity
Functionals
Laboratories
metagenomic analysis
Metagenomics
Microbial activity
Microorganisms
PGPR
Pine trees
Plant growth
Reforestation
Seedlings
Soil erosion
Soil improvement
Structure-function relationships
Taxa
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Summary:The use of plant growth-promoting rhizobacteria (PGPR) inoculated on plants has shown that it can increase the success of reforestation and accelerate soil recovery by improving soil microbial diversity. Three PGPR isolated from natural pine populations were selected for their metabolic capabilities and taxonomic affiliation (Z4.3; Bacillus sp., Z5.4; Arthobacter sp., and Z7.15; and Pseudomonas sp.) when inoculated alone or in combination (consortium) on stone pine seedlings before transplanting to the field. Before transplanting and after nine months, rhizospheric soil samples were collected for structural and functional metagenomic studies. First, the data were analyzed using EasyMAP. Neither alpha nor beta diversity showed significant differences between the samples, although unique taxa representative of each sample were detected. The predominant phylum in all cases was Proteobacteria, followed by Bacteroidetes and Acidobacteria. The linear discriminant analysis (LDA) effect size (LEfSe) found significantly over-represented taxa in some samples, highlighting different representatives of the order Sphingomonadales in several of them. Functional inference performed with PICRUSt also showed significantly over-represented functions in some samples. The study demonstrates that PGPR have a positive effect on plants and cause detectable changes in microbial communities in terms of both structure and function.
ISSN:2571-8789
2571-8789
DOI:10.3390/soilsystems8020039