The Role of Secretion Systems, Effectors, and Secondary Metabolites of Beneficial Rhizobacteria in Interactions With Plants and Microbes

Lucke, Miriam; Correa, Mario Gabriel; Levy, Asaf

doi:10.3389/fpls.2020.589416

Cited by 66 publications

(51 citation statements)

References 157 publications

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“…This agreed with the findings of Crovadore et al (2020) that reported the whole genome analysis to reveal the plant growth-promoting functional genes in Pseudomonas and Bacillus species. The production of secondary metabolites by plant growth-promoting rhizobacteria has to be reported to enhance plant growth (Lucke et al 2020). In this study, the genomic analysis of the rhizobacterial strains revealed production of different secondary metabolites that are responsible for plant growth promotion among which Non-Ribosomal Peptide Synthetase (NRPS), arypolyene, and resorcinol are selected.…”

Section: Discussionmentioning

confidence: 99%

Characterization of plant growth-promoting rhizobacterial isolates associated with food plants in South Africa

Fasusi

Amoo

Babalola

2021

Antonie van Leeuwenhoek

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The region around the plant root referred to as the rhizosphere, is the zone where various microbial activity occurs. It performs crucial functions such as increasing the uptake of nutrients for plant development and preventing plant against plant pathogens. Keeping in mind the beneficial role performed by rhizospheric microorganisms, rhizobacterial species were isolated from the maize and soybean plant's rhizosphere. The isolated microorganisms were evaluated for their biochemical characteristics, plant growth-promoting potentials, tolerance to different environmental conditions, and their antifungal activity against Fusarium graminearum, a fungal pathogen that infects maize. The rhizobacterial isolates with multiple plant growth-promoting potentials were identified as Bacillus spp (80.77%), Rhodocyclaceae bacterium (3.85%), Enterococcus spp (3.85%). Massilia spp (3.85%. and Pseudomonas (7.69%) species based on their 16S rRNA molecular characterization. The bacterial isolates possessed antifungal activities against Fusarium graminearum, promote maize and soybeans seed under laboratory conditions, and exhibited different levels of tolerance to pH, temperature, salt, and heavy metal. Based on this, the whole genome sequencing of Bacillus sp. OA1, Pseudomonas rhizosphaerea OA2, and Pseudomonas sp. OA3 was performed using Miseq Illumina system to determine the functional genes and secondary metabolites responsible for their plant growth-promoting potential Thus, the result of this research revealed that the selected bacterial isolates possess plant growth-promoting potentials that can make them a potential candidate to be employed as microbial inoculants for protecting plants against phytopathogens, environmental stress and increasing plant growth and productivity.

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Section: Discussionmentioning

confidence: 99%

Characterization of plant growth-promoting rhizobacterial isolates associated with food plants in South Africa

Fasusi

Amoo

Babalola

2021

Antonie van Leeuwenhoek

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“…Aryl polyenes, which are structurally similar to carotenoids, were enriched by Flavobacteriaceae; terpenes and resorcinol were enriched by Chitinophaga. Similarly, in 2020 Lucke et al reported that as biocontrol agents, the secretion of secondary metabolites triggered the induction of systemic resistance in plants [11]. In particular, they pointed out the importance of the chitinase from Flavobacterium and the Polyketide Synthase (PKS) gene cluster from Chitinophaga that is essential for disease suppression.…”

Section: Flavobacterium and Chitinophagamentioning

confidence: 99%

Microbes in the <em>Datura</em> Rootzone Contribute to an Antioxidant Support System of Flavonoids and Other Aromatic Compounds

Senn¹,

Pangell²,

Bowerman³

2021

Preprint

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The purpose of this paper is to elucidate the roles that microbes may be playing in the rootzone of the medicinal plant Datura inoxia. We hypothesized that rhizospheric and endophytic microbes would be found that were capable of performing the same secondary metabolic functions of the plant rootzone they inhabited. We also hypothesized that the microbial functions would be co-operative with and supportive to plant secondary metabolite production, for example, by providing precursors to important plant bioactive molecules. The methods employed were mi-crobial barcoding, tests of essential oils against antibiotic resistant bacteria and other soil bacterial isolates, 16S Next Generation Sequencing (NGS) metabarcoding, and Whole Genome Shotgun (WGS) taxonomic and functional. A few of the main bacterial genera of interest that were dis-covered in the Datura root microbiome were Flavobacterium, Chitinophaga, Pseudomonas, Strepto-myces, Rhizobium, and Bacillus. In the context of known interactions, and current results, plants and microbes influence the flavonoid biosynthetic pathways of one other, in terms of the regulation of the phenylpropanoid pathway. This is important because these compounds are phyto-protective antioxidants and are precursors to many aromatic bioactive compounds that are relevant to human health. There was strong evidence to support the notion that synergistic production of plant de-rived secondary metabolites by microbes occurred, as well as the ability for the compounds to enter plant cells. There are possible biopharmaceutical and agricultural applications of the natural interplay that was discovered during this study of the Datura inoxia rhizosphere.

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“…Fertilizers and pesticides based on beneficial microorganisms are a clever solution to the current dilemma avoiding the use of toxic chemical compounds. Organisms with the capacity to promote plant growth (PGPR) including nitrogen‐fixing bacteria, and control pests (BCAs) have been used in the past and widely demonstrated their worthiness (Lucke et al ., 2020). A deeper understanding of the physiology of these microorganisms and the molecular mechanisms responsible for the positive effects on crops will allow extensive and efficient use of green fertilizers and pesticides that will become a real and clean alternative for the agriculture of the future.…”

Section: Introductionmentioning

confidence: 99%

Plant holobiont interactions mediated by the type VI secretion system and the membrane vesicles: promising tools for a greener agriculture

Acuña

Bernal

2021

Environmental Microbiology

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A deeper understanding of the complex relationship between plants and their microbiota is allowing researchers to appreciate a plethora of possibilities to improve crops using chemical-free alternatives based on beneficial microorganisms. An increase in crop yield from the promotion of plant growth or even simultaneous protection of the plants from the attack of phytopathogens can be achieved in the presence of different plant-associated microorganisms known as plant-growthpromoting rhizobacteria (PGPR) and biocontrol agents (BCAs), respectively. Thus, the study of the great diversity of plant-microbe and microbe-microbe interactions is an attention-grabbing topic covering studies of interactions since the plant seed and through all developmental stages, from root to shoot. The intricate communication systems that plant holobionts co-evolved has resulted in many different strategies and interplays between these organisms shaping the bacterial communities and the plant fitness simultaneously. Herein, we emphasize two understudied delivery systems existing in plant-associated bacteria: the type VI secretion system (T6SS) and the membrane vesicles with a huge potential to boost a highly demanded and necessary green agriculture.

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The Role of Secretion Systems, Effectors, and Secondary Metabolites of Beneficial Rhizobacteria in Interactions With Plants and Microbes

Cited by 66 publications

References 157 publications

Characterization of plant growth-promoting rhizobacterial isolates associated with food plants in South Africa

Characterization of plant growth-promoting rhizobacterial isolates associated with food plants in South Africa

Microbes in the <em>Datura</em> Rootzone Contribute to an Antioxidant Support System of Flavonoids and Other Aromatic Compounds

Plant holobiont interactions mediated by the type VI secretion system and the membrane vesicles: promising tools for a greener agriculture

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