Biology subjects

Jara-Servin, A.

Publications and source records attributed to Jara-Servin, A..

3 recordsLinked to original sources

bioRxiv2024

Rhizosphere Microbiome Influence on Tomato Growth under Low-Nutrient Settings

Studies have shown that reduced nutrient availability enhances microbial diversity around plant roots, positively impacting plant productivity. However, the specific contributions of rhizosphere microbiomes in nutrient-poor environments still need to be better understood. This study investigates the role of Plant Growth-Promoting Rhizobacteria (PGPR) in enhancing the growth of Solanum lycopersicum under hydroponic conditions. We hypothesised that nutrient limitation would increase the selection of beneficial bacterial communities, compensating for nutrient deficiencies. Our hydroponic system, with treatments consisting of 50% reduced fertiliser application supplemented with a soil-derived inoculum, exhibited greater bacterial diversity and biomass than controls, suggesting a successful enrichment of PGPR that compensates for nutrient deficiencies. Using 16S rRNA gene sequencing, we found a significant enrichment (p [≤] 0.001) and correlation with beneficial plant traits (p [≤] 0.05) of bacterial genera such as Luteolibacter, Sphingopyxis, and Kaistia. Shotgun metagenomics identified the critical role of Methyloversatilis in nitrogen fixation and other key taxa bacterial proteins in plant-bacteria interactions. Additionally, our findings identify core taxa across different cultivation systems. These results support the potential for microbiome engineering to enhance microbial diversity and plant productivity, offering a path to reduce fertiliser use in agriculture and improve sustainability.

genomics↗

bioRxiv2024

Microbial communities thriving in agave fermentations are locally influenced across diverse biogeographic regions

The production of traditional agave spirits in Mexico is a deeply rooted traditional process that relies on environmental microorganisms to ferment the cooked must from agave plants. Analysis of these microorganisms provides the opportunity to understand the dynamics of the microbial communities in the interface of natural and human-associated environments in a biologically and culturally rich region of the world. Here, we performed 16S and ITS amplicon sequencing of close to 100 fermentation tanks from 42 distilleries throughout Mexico. The Agave species used, production practices, climatic conditions, and biogeographic characteristics varied considerably among sites. Yet, we did find taxa present in most fermentations suggesting that there is a core of microorganisms that are hallmarks of these communities. These core taxa are represented by hundreds of OTUs showing large intra-specific variation. The only variable that was consistently associated with the composition of both bacterial and fungal communities was the distillery, suggesting that microbial composition is determined by the local production practices and unique attributes of each site. Fermentation stage, climate and producing region were also associated with the community composition, but only for prokaryotes. Analysis of microbial composition in several tanks within three distilleries also revealed taxa that were enriched in specific fermentation stages or agave species. Our work provides a comprehensive analysis of the microbiome of agave fermentations, contributing key knowledge for its management and conservation.

microbiology↗

bioRxiv2023

Unraveling the Genomic and Environmental Diversity of the Ubiquitous Solirubrobacter

2.Solirubrobacter, a genus within the Actinobacteriota phylum, is commonly found in soils and rhizospheres yet remains unexplored despite its widespread presence and diversity, as revealed through metagenomic studies. Previously recognized as a prevalent soil bacterium, our study delved into phylogenomics, pangenomics, environmental diversity, and bacterial interactions of Solirubrobacter. Analyzing the limited genomic sequences available for this genus, we uncovered a pangenome consisting of 19,645 protein families, with 2,644 constituting a strict core genome. While reported isolates do not exhibit motility, we intriguingly discovered the presence of flagellin genes, albeit with an incomplete flagellum assembly pathway. Our examination of 16S ribosomal genes unveiled a considerable diversity (3,166 operational taxonomic units OTUs) of Solirubrobacter in Mexican soils, and co-occurrence network analysis indicated its extensive connectivity with other bacterial taxa. Through phylogenomic analysis, we delved into the relatedness of sequenced strains and notably dismissed ASM999324v1 as a member of this genus. Our investigation extended to the metagenomic diversity of Solirubrobacter across various environments, affirming its pervasive presence in rhizospheres and certain soils. This broader pangenomic view revealed genes linked to transcription, signal transduction, defense mechanisms, and carbohydrate metabolism, highlighting Solirubrobacters adaptability. We observed that Solirubrobacters prevalence in rhizospheres is geographically indiscriminate, prompting intriguing questions about its potential interactions with plants and the biotic and abiotic determinants of its soil occurrence. Given its richness and diversity, Solirubrobacter might be a versatile yet overlooked keystone species in its environments, meriting further recognition and study. 3. Impact statementThis study explored the enigmatic world of Solirubrobacter, a widespread microbe commonly found in soils and plants across various regions. Despite its prevalence, little is known about its genetic diversity and functionality and how it thrives in diverse environments. Our research unveils the genetic secrets of Solirubrobacter, shedding light on its adaptability and ecological interactors and roles. We showed that Solirubrobacter environmental prevalence makes it a good candidate for studying the genetic basis of being a successful microbe associated with soil and plants. 4. Data summaryData, scripts and statistical analysis available in GitHub: https://github.com/genomica-fciencias-unam/Solirubrobacter Sequences, phylogenetic analysis, raw data structures: https://doi.org/10.6084/m9.figshare.24446521 16S rRNA gene raw data: https://www.ncbi.nlm.nih.gov/sra/PRJNA603586 https://www.ncbi.nlm.nih.gov/sra/PRJNA603590 Shotgun metagenomes: https://www.ncbi.nlm.nih.gov/bioproject/603603 All supporting data, code, and protocols are within the article, supplementary files, and described repositories.

genomics↗