Aug 2026· World Journal of Microbiology & Biotechnology· Vol 42· 0 citations· 114 references
Medicine
TL;DR
Indigenous bacterial and archaeal communities in agricultural soils were analyzed to provide a basis for biocontrol and bioremediation solutions to be reintroduced in affected areas and showed in vitro the most promising combination of PGP traits, metal tolerance, and antifungal activity against most phytopathogenic fungi.
Soil salinization is among the most critical threats to agriculture and food security, particularly in arid and semi-arid regions. Despite their ecological and agricultural significance, the microbial processes in saline soils of arid regions remain poorly characterized. This first 16S rRNA amplicon-based study of Algerian saline soils examines bacterial communities and physico-chemical properties in the Naama salt flat, focusing on both bulk and rhizosphere soils associated with Tamarix gallica L. Bacterial diversity and community composition were analyzed through high-throughput 16S rRNA gene sequencing on an Illumina MiSeq platform, and soil parameters, including salinity, nutrients, organic carbon, and water retention were measured. Sequence data were processed with QIIME2, and multivariate analyses were applied to compare soil types and explore correlations between taxa and soil properties. Rhizosphere soils tended towards higher Na+, K+, and Ca2+ levels, whereas bulk soils showed greater phosphorus availability. Bacterial diversity was lower in the rhizosphere, which was characterized by a distinct taxonomic composition, including taxa such as Promicromonospora and Nocardioides potentially involved in nutrient cycling and stress adaptation. Correlation analyses revealed microbial adaptations to salinity and nutrient availability. This study lays the groundwork for developing plant growth-promoting rhizobacteria aiming to combat land degradation and contribute to long-term food security and environmental resilience in arid regions.
H. Abdelbari, N. Rodríguez-Berbel, R. Ortega et al.· Frontiers in Microbiology· 0 citations
The increasing demand for food has driven intensive agricultural practices, which negatively impact soil health and ecosystem stability; therefore, it is necessary to adopt sustainable alternatives that enhance crop productivity while minimizing environmental damage. The aim of this study was to characterize the bacterial and fungal microbiota present in bioinputs derived from mountain soil microorganisms used in maize cultivation, as well as the microbial communities in agricultural soils at the end of the cultivation stage across different plots in the Frailesca region, Chiapas, Mexico. Bacterial communities showed differences among bioinputs depending on their origin, while soil samples showed relatively similar bacterial distribution patterns across plots. Conversely, fungal communities displayed heterogeneous distribution patterns in both bioinputs and soils. Several microbial groups related to beneficial functions for plants and soil, such as nitrogen fixation, phosphate solubilization, and the production of phytohormones and siderophores were identified; those belonging to the genera Acetobacter, Klebsiella, Meyerozyma, Saccharomyces, and Paecilomyces were found in bioinputs, while those belonging to the genera Bradyrhizobium, Sphingomonas, Penicillium, Talaromyces, Humicola, and Metarhizium were identified in soil samples. The results demonstrate that bioinputs contain microbial communities with potential plant growth-promoting functions and can serve as strategies for improving soil health through sustainable agricultural production.
I. O. Velázquez-Ríos, Lissy Rosabal-Ayan, Francisco Guevara-Hernández et al.· Sustainability· 0 citations
Plant biostimulants are increasingly recognized as natural solutions that enhance plant growth and support sustainable agriculture. However, their effects on soil microbial communities remain poorly understood. This study evaluated three biostimulants: Plantiful™ (fermented marine algae with beneficial bacteria), CelexT07™ (fermented medicinal plants with beneficial bacteria), and Phylgreen™ (seaweed extract), compared with water and conventional NPK fertilization. Rhizospheric microbial biomass, community structure, and metabolic potential were assessed using metabarcoding, phospholipid fatty acid (PLFA) profiling, and Biolog EcoPlates™ assays. Total microbial biomass did not differ significantly from the untreated control. Similarly, bacterial biomass (7.4–9.8 µg/g soil) remained stable across treatments. Saprotrophic fungal biomass was 2–4-fold lower under PhylgreenTM and CelexT07TM than NPK, but comparable to the control. Bacterial and fungal communities were dominated by Actinobacteriota, Pseudomonadota, Acidobacteriota, Chloroflexota, and Ascomycota, with similar richness and diversity across treatments in wheat rhizosphere soil after 9 weeks of growth. Functional analyses revealed only modest shifts, with AWCD being significantly reduced by 43.5% under Phylgreen™ (64.11) compared with NPK (113.44), while remaining comparable to the untreated control (94.74). The network analysis results were also consistent with the previous results, indicating that biostimulant treatments maintained microbial richness. Overall, these findings support the use of the tested biostimulants as sustainable crop management tools that preserve rhizosphere microbial communities.
Oumaima Akachoud, Paola Villanueva Rosales, J. Fontaine et al.· Agriculture· 0 citations
Findings highlight the potential biotechnological relevance of culturable bacterial isolates recovered from historically mining-impacted soils and provide genomic resources for future studies on environmental remediation, sustainable agriculture, and industrial biotechnology.
M. J. Puy-Alquiza, B. N. Luna, Lorena Rodríguez Orduña et al.· Geomicrobiology Journal· 0 citations
Western ghats in India, one of the world’s biodiversity hot spots is the reservoirs of microbial resources having agricultural and industrial significance. However, the diversity of plant growth-promoting microbial communities associated with the plants and soil in the Western Ghats is untapped vault. The current emphasis on natural farming is more depending on the indigenous microbial communities and their metabolic functions towards sustainable one -health. With this background, the present study examines the bacterial diversity of soils from the Western Ghats of Nilgiris, Coimbatore and Dindigul regions. Among the 10 soil samples collected (S1 to S10), three soil samples (S2, S4 and S6) representing respective three regions were subjected for metagenomic studies based on their distinct soil chemical and biological properties. The computational analysis of the metagenome revealed the core genus
Bradhyrhizobium
in all soil samples, while
Trebonia
,
Arthrobacter, Streptomyces,
and
Pseudomonas
are the next most abundant genera, which varied substantially. The results collectively demonstrate that soil sample from Dindigul harbours the richest and most diverse microbial community among the three regions. In culturable studies, a total of 101 bacterial isolates were obtained from 10 soil samples (S1 to S10). Among them four Gram-negative bacterial isolates showed potential plant growth-promoting attributes, such as Ammonia, Indole Acetic Acid, Hydrogen cyanide and siderophore production, phosphorus, potassium, and zinc solubilization. The 16S rDNA analysis revealed that the bacterial isolates were
Pseudomonas glycinae
S6B1,
Pseudomonas tolaasii
S2B3,
Pseudomonas azotoformans
S9H10, and
Pseudomonas poae
S10B2. The isolate, S10B2, exhibited the maximum inhibition, with 81.25%, 70.1%, and 35% against plant pathogenic fungi,
Rhizoctonia solani
,
Sclerotium rolfsii
, and
Fusarium oxysporum
, respectively, indicating strong biocontrol potential. The effect of bacterial inoculants on chick pea (
Cicer arietinum
var. JG 62), showed that
P. glycinae
S6B1 significantly promoted plant growth such as root length, shoot length, and fresh/dry biomass. These findings unlock the core microbiome of soils of Western Ghats, which can be utilized to develop a synthetic microbial consortium to boost agricultural productivity.
Manikandan Murugesan, Sugitha Thankappan, V. Mageshwaran et al.· Frontiers in Microbiology· 0 citations
These distinct functional profiles demonstrates that the protected root endomicrobiome specializes in plant signalling and nutrient assimilation, while the rhizosphere microbiome, facing higher competition, specializes in nutrient acquisition and stress resilience.
Vrishali Rajendra Bankar, S. Chapadgaonkar, Kausik Bhattacharyya et al.· Frontiers in Bioinformatics· 0 citations