Biotechnological potential of plant growth-promoting bacteria from the roots and rhizospheres of endemic plants in ironstone vegetation in southeastern Brazil

Felestrino, Érica Barbosa; Vieira, Izadora Tabuso; Caneschi, Washington Luiz; Cordeiro, Isabella Ferreira; Assis, Renata de Almeida Barbosa; Lemes, Camila Gracyelle de Carvalho; Fonseca, Natasha Peixoto; Sanchez, Angélica Bianchini; Caicedo, Juan Carlos; Ferro, José M.; García, Camila; Carmo, Flávio Fonseca do; Kamino, Luciana Hiromi Yoshino; Moreira, Leandro Márcio

doi:10.1007/s11274-018-2538-0

Cited by 22 publications

(8 citation statements)

References 42 publications

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“…The environmental differences between tropical and temperate caves directly influenced the microbial communities within subterranean system. Tropical caves are a particularly understudied environment, and most of what we know about microbial communities was based on studies using culture-dependent methods [44 – 47]. While there are some published results generated by culture-independent approaches [6, 48], this is the first comprehensive study reporting the microbiome composition from a tropical cave, including prokaryotic and fungal assemblages through next generation sequencing.…”

Section: Discussionmentioning

confidence: 99%

First Report of Halobacteria Dominance in a Tropical Cave Microbiome

Paula

Sirová

Sarmento

et al. 2021

Preprint

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Scarce studies on microbial diversity in tropical caves have been published, a subterranean system still neglected from a microbiological point of view. Although most published studies are about temperate caves, usually archaeas and fungi have less attention than bacterial communities. Here, the microbiome structure and composition in a tropical cave system, as well the main environmental drivers, were studied during the wet and dry season. Soil and sediments from three different habitats at the cave (surface, entrance cave and dark zone) were sampled. Samples were characterized (temperature, air and substrate humidity, salinity, pH, nitrogen and organic carbon content, and chemical composition) and the microbiome was assessed by high-throughput sequencing, using amplicon sequencing (16S and ITS). Prokaryotic communities were dominated by Halobacteria, Actinobacteria and Bacilli, while fungal communities showed high abundance of Sordariomycetes. Microbiomes from the cave entrance, where a significantly elevated salinity levels were found, supported up to 63% of Haloarchaea compared to the other habitats studied. Differences in community structure were significant between habitats, but no influence of the season was observed. Main environmental drivers of community assembly included nitrogen and organic carbon content, temperature, and salinity. This is the first report of Halobacteria dominance in cave habitats, where they likely play important roles in nitrogen and phosphorus cycles. The cave entrance had lower diversity, but higher degree of microbial endemism, which characterize it as an important cave ecotone. The prevalence of heterotrophic microbial groups implies trophic structure based on detritivores, particularly in the dark zones. Our study brings new insights on microbiome composition in the underexplored tropical cave habitats.

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Section: Discussionmentioning

confidence: 99%

First Report of Halobacteria Dominance in a Tropical Cave Microbiome

Paula

Sirová

Sarmento

et al. 2021

Preprint

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“…The characteristics and aspects of the environment in IQ form this singular environment, which adds even greater scientific interest as it is a key area for the conservation efforts focused on protecting microbiological diversity. These conservation efforts also favor the investigations about bacteria associated with rare plants of ferruginous rocky fields as a reservoir of the microbiota of biotechnological and ecological [62,63] and, in addition, protect the plant biodiversity, which includes hundreds of endemic [64][65][66] and rare species [65] (Supplementary Figure S1). Even with the imminent risk of loss of these environments, studies involving such cavities are still incipient, and the microbiota associated with this geosystem are understudied.…”

Section: Ferruginous Caves In Iqmentioning

confidence: 99%

16S rRNA Gene Amplicon Sequencing Data of the Iron Quadrangle Ferruginous Caves (Brazil) Shows the Importance of Conserving This Singular and Threatened Geosystem

et al. 2021

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The Iron Quadrangle (IQ) is one of the main iron ore producing regions of the world. The exploitation of its reserves jeopardizes the high biological endemism associated with this region. This work aimed to understand the diversity and bacterial potential associated with IQ caves. Floor and ceiling samples of seven ferruginous caves and one quartzite cave were collected, and their microbial relative abundance and diversity were established by 16S rRNA gene amplicon sequencing data. The results showed that ferruginous caves present higher microbial abundance and greater microbial diversity compared to the quartzite cave. Many species belonging to genera found in these caves, such as Pseudonocardia and Streptacidiphilus, are known to produce biomolecules of biotechnological interest as macrolides and polyketides. Moreover, comparative analysis of microbial diversity and metabolic potential in a biofilm in pendant microfeature revealed that the microbiota associated with this structure is more similar to the floor rather than ceiling samples, with the presence of genera that may participate in the genesis of these cavities, for instance, Ferrovum, Geobacter, and Sideroxydans. These results provide the first glimpse of the microbial life in these environments and emphasize the need of conservation programs for these areas, which are under intense anthropogenic exploration.

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“…For instance, the composition of the fungal cell wall is made up from chitin, while the bacterial cell wall is made up from peptidoglycan, i.e., a polysaccharide chain cross-linked with unusual peptides (Arroyo et al 2016;Walter & Mayer 2019). The cell wall of pathogenic bacteria, fungi, and protozoa are hydrolysed by lytic enzymes, such as protease, acylases, and lactonases that are produced by beneficial rhizobacteria, thereby preventing pathogenic microorganisms from causing diseases in plants (Felestrino et al 2018). Recently, Streptomyces spp.…”

Section: Production Of Lytic Enzymesmentioning

confidence: 99%

The multifaceted plant-beneficial rhizobacteria toward agricultural sustainability

Babalola¹,

Fasusi²

2021

Plant Prot. Sci.

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Agricultural practices depend mainly on the use of chemical fertilisers, pesticides, and herbicides which have caused serious health hazards and have also contributed to the pollution of the environment at large. The application of plant-beneficial rhizobacteria in agrarian practices has become paramount in increasing soil fertility, promoting plant growth, ensuring food safety, and increasing crop production to ensure sustainable agriculture. Beneficial rhizobacteria are soil microorganisms that are eco-friendly and serve as a modern method of improving the plant yield, protecting the plant and soil fertility that pose no harm to humans and the environment. This eco-friendly approach requires the application of beneficial rhizobacteria with plant growth-promoting traits that can improve the nutrient uptake, enhance the resistance of plants to abiotic and biotic stress, protect plants against pathogenic microorganisms and promote plant growth and yield. This review article has highlighted the multitasking roles that beneficial rhizobacteria employ in promoting plant growth, food production, bioremediation, providing defence to plants, and maintaining soil fertility. The knowledge acquired from this review will help in understanding the bases and importance of plant-beneficial rhizobacteria in ensuring agricultural sustainability and as an alternative to the use of agrochemicals.

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Biotechnological potential of plant growth-promoting bacteria from the roots and rhizospheres of endemic plants in ironstone vegetation in southeastern Brazil

Cited by 22 publications

References 42 publications

First Report of Halobacteria Dominance in a Tropical Cave Microbiome

First Report of Halobacteria Dominance in a Tropical Cave Microbiome

16S rRNA Gene Amplicon Sequencing Data of the Iron Quadrangle Ferruginous Caves (Brazil) Shows the Importance of Conserving This Singular and Threatened Geosystem

The multifaceted plant-beneficial rhizobacteria toward agricultural sustainability

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