Underground fires shape the structure of microbial communities and select for thermophilic bacteria through a temperature gradient

Flores-Piña, Aurora; Valencia-Cantero, Eduardo; Santoyo, Gustavo

doi:10.1016/j.micres.2024.127996

Microbiological Research

2025

DOI: 10.1016/j.micres.2024.127996

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Underground fires shape the structure of microbial communities and select for thermophilic bacteria through a temperature gradient

Aurora Flores-Piña,

Eduardo Valencia-Cantero,

Gustavo Santoyo

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Stress-Tolerant Bacillus Strains for Enhancing Tomato Growth and Biocontrol of Fusarium oxysporum under Saline Conditions: Functional and Genomic Characterization

Valencia-Marin,

Chávez-Avila,

Sepúlveda

et al. 2024

Preprint

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Soil salinity is a major limiting factor for agricultural crops, which increases their susceptibility to pathogenic attacks. This is particularly relevant for tomato (Solanum lycopersicum), a salt-sensitive crop. Fusarium wilt, caused by Fusarium oxysporum f. sp. lycopersici, is a significant threat to tomato production in both greenhouse and field environments. This study evaluated the salinity tolerance, biocontrol, and plant growth-promoting properties of Bacillus velezensis AF12 and Bacillus halotolerans AF23, isolated from soil affected by underground fires and selected for their resistance to saline conditions (up to 1000 mM NaCl). In vitro assays confirmed that both strains produced siderophores, indole-3-acetic acid (IAA), and proteases, and exhibited phosphate solubilization under saline stress (100–200 mM NaCl). AF23 exhibited synergistic interactions with AF12, and inoculation with either strain individually or in combination significantly improved the growth of the Bonny Best tomato cultivar under 200 mM saline stress, leading to increased shoot and root weight, enhanced chlorophyll content, and higher total biomass. The biocontrol potential of AF12 and AF23 was evaluated in tomato plants infected with F. oxysporum. Both strains, individually or combined, increased shoot and root weight, chlorophyll content, and total biomass under non-saline conditions, promoting growth and reducing infection rates under saline stress (100 mM NaCl). Genomic analysis revealed that both strains harbored genes related to salt stress tolerance, biocontrol, and plant growth promotion. In conclusion, Bacillus AF23 and AF12 demonstrated strong potential as bioinoculants for enhancing tomato growth and providing protection against F. oxysporum in saline-affected soils.

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Stress-Tolerant Bacillus Strains for Enhancing Tomato Growth and Biocontrol of Fusarium oxysporum under Saline Conditions: Functional and Genomic Characterization

Valencia-Marin,

Chávez-Avila,

Sepúlveda

et al. 2024

Preprint

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Underground fires shape the structure of microbial communities and select for thermophilic bacteria through a temperature gradient

Cited by 1 publication

References 107 publications

Stress-Tolerant Bacillus Strains for Enhancing Tomato Growth and Biocontrol of Fusarium oxysporum under Saline Conditions: Functional and Genomic Characterization

Stress-Tolerant Bacillus Strains for Enhancing Tomato Growth and Biocontrol of Fusarium oxysporum under Saline Conditions: Functional and Genomic Characterization

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