Small molecule reaction networks that model the ROS dynamics of the rhizosphere

Taran, Olga; Patel, Vraj; Lynn, David G.

doi:10.1039/c8cc08940j

Cited by 11 publications

(14 citation statements)

References 33 publications

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“…It has been observed that rhizosphere bacteria are exposed to high levels of reactive oxygen species (ROS) that are formed along the plant root surface during the reaction of redox-active plant secondary metabolites, such as phenols, quinones, flavins, and phenazines, with molecular oxygen [ 90 ]. Additionally, upon contact with bacteria, one of the plant defense reactions is the production of ROS, nitric oxide and phytoalexins; thus, rhizosphere bacteria must survive in a highly oxidative environment during the colonization of plant tissues.…”

Section: Resultsmentioning

confidence: 99%

Analysis of the Genome of the Heavy Metal Resistant and Hydrocarbon-Degrading Rhizospheric Pseudomonas qingdaonensis ZCR6 Strain and Assessment of Its Plant-Growth-Promoting Traits

Chlebek

Płociniczak

Gobetti

et al. 2021

IJMS

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The Pseudomonas qingdaonensis ZCR6 strain, isolated from the rhizosphere of Zea mays growing in soil co-contaminated with hydrocarbons and heavy metals, was investigated for its plant growth promotion, hydrocarbon degradation, and heavy metal resistance. In vitro bioassays confirmed all of the abovementioned properties. ZCR6 was able to produce indole acetic acid (IAA), siderophores, and ammonia, solubilized Ca3(PO4)2, and showed surface active properties and activity of cellulase and very high activity of 1-aminocyclopropane-1-carboxylic acid deaminase (297 nmol α-ketobutyrate mg−1 h−1). The strain degraded petroleum hydrocarbons (76.52% of the initial hydrocarbon content was degraded) and was resistant to Cd, Zn, and Cu (minimal inhibitory concentrations reached 5, 15, and 10 mM metal, respectively). The genome of the ZCR6 strain consisted of 5,507,067 bp, and a total of 5055 genes were annotated, of which 4943 were protein-coding sequences. Annotation revealed the presence of genes associated with nitrogen fixation, phosphate solubilization, sulfur metabolism, siderophore biosynthesis and uptake, synthesis of IAA, ethylene modulation, heavy metal resistance, exopolysaccharide biosynthesis, and organic compound degradation. Complete characteristics of the ZCR6 strain showed its potential multiway properties for enhancing the phytoremediation of co-contaminated soils. To our knowledge, this is the first analysis of the biotechnological potential of the species P. qingdaonensis.

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Section: Resultsmentioning

confidence: 99%

Analysis of the Genome of the Heavy Metal Resistant and Hydrocarbon-Degrading Rhizospheric Pseudomonas qingdaonensis ZCR6 Strain and Assessment of Its Plant-Growth-Promoting Traits

Chlebek

Płociniczak

Gobetti

et al. 2021

IJMS

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“…[4] Initially, ROS were recognized as integral to adversarial immune interactions: host cells generate ROS to defend against pathogen threats while microbes respond to ROS by upregulating antioxidant defense mechanisms. More recently, the biological role of ROS has been expanded beyond adversarial hostpathogen interactions and now ROS are believed to be broadly important in the communication between a host and its microbiome (e.g., between the gut epithelium and its microbiome, [5][6][7] or between the root and its rhizosphere community [8][9][10] ). Interestingly, phenolics are often believed to play an important but incompletely understood, role in redox-based interactions.…”

Section: Doi: 101002/adma202007758mentioning

confidence: 99%

Interactive Materials for Bidirectional Redox‐Based Communication

Wang

Zong

et al. 2021

Advanced Materials

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Emerging research indicates that biology routinely uses diffusible redox‐active molecules to mediate communication that can span biological systems (e.g., nervous and immune) and even kingdoms (e.g., a microbiome and its plant/animal host). This redox modality also provides new opportunities to create interactive materials that can communicate with living systems. Here, it is reported that the fabrication of a redox‐active hydrogel film can autonomously synthesize a H2O2 signaling molecule for communication with a bacterial population. Specifically, a catechol‐conjugated/crosslinked 4‐armed thiolated poly(ethylene glycol) hydrogel film is electrochemically fabricated in which the added catechol moieties confer redox activity: the film can accept electrons from biological reductants (e.g., ascorbate) and donate electrons to O2 to generate H2O2. Electron‐transfer from an Escherichia coli culture poises this film to generate the H2O2 signaling molecule that can induce bacterial gene expression from a redox‐responsive operon. Overall, this work demonstrates that catecholic materials can participate in redox‐based interactions that elicit specific biological responses, and also suggests the possibility that natural phenolics may be a ubiquitous biological example of interactive materials.

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“…Redox cycling between quinones and hydroquinones occurs in the rhizosphere with a great impact on plant-microbe interactions (Taran et al, 2019). Such redox cycling is known to be used as a lignocellulolytic agent by wood-decaying brown rot fungi.…”

Section: Roles Of Hifs In Host-parasitic Plant Interactions After Prementioning

confidence: 99%

Haustorium Inducing Factors for Parasitic Orobanchaceae

et al. 2019

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Parasitic plants in the Orobanchaceae family include devastating weed species, such as Striga , Orobanche , and Phelipanche , which infest important crops and cause economic losses of over a billion US dollars worldwide, yet the molecular and cellular processes responsible for such parasitic relationships remain largely unknown. Parasitic species of the Orobanchaceae family form specialized invasion organs called haustoria on their roots to enable the invasion of host root tissues. The process of forming haustoria can be divided into two steps, prehaustorium formation and haustorium maturation, the processes occurring before and after host attachment, respectively. Prehaustorium formation is provoked by host-derived signal molecules, collectively called haustorium-inducing factors (HIFs). Cell wall-related quinones and phenolics have been known for a long time to induce haustoria in many Orobanchaceae species. Although such phenolics are widely produced in plants, structural specificities exist among these molecules that modulate their competency to induce haustoria in different parasitic plant species. In addition, the plant hormone cytokinins, structurally distinct from phenolic compounds, also trigger prehaustorium formation in Orobanchaceae. Recent findings demonstrate their involvement as rhizopsheric HIFs for Orobanche and Phelipanche species and thus address new activities for cytokinins in haustorium formation in Orobanchaceae, as well as in rhizospheric signaling. This review highlights haustorium-inducing signals in the Orobanchaceae family in the context of their host origin, action mechanisms, and species specificity.

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Small molecule reaction networks that model the ROS dynamics of the rhizosphere

Abstract: Molecules released by plants and bacteria form complex abiotic reaction diffusion networks that might regulate the ROS dynamics along the roots of the plants.

Cited by 11 publications

References 33 publications

Analysis of the Genome of the Heavy Metal Resistant and Hydrocarbon-Degrading Rhizospheric Pseudomonas qingdaonensis ZCR6 Strain and Assessment of Its Plant-Growth-Promoting Traits

Analysis of the Genome of the Heavy Metal Resistant and Hydrocarbon-Degrading Rhizospheric Pseudomonas qingdaonensis ZCR6 Strain and Assessment of Its Plant-Growth-Promoting Traits

Interactive Materials for Bidirectional Redox‐Based Communication

Haustorium Inducing Factors for Parasitic Orobanchaceae

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