Rhizobacteria-Mediated Root Architectural Improvement: A Hidden Potential for Agricultural Sustainability

Ambreetha, Sakthivel; Balachandar, D.

doi:10.1007/978-981-13-7553-8_6

Cited by 6 publications

(4 citation statements)

References 79 publications

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“…Plant root exudates contain tryptophan that can be converted into IAA by the associated microbes (Kravchenko et al, 2004). Exogenous auxin released by the rhizospheric and endophytic bacteria contributes to cell division, cell elongation, improvement of the root architecture and development of leaves, fruits and flowers (Ali et al, 2017; Ambreetha & Balachandar, 2019; Sukumar et al, 2013). In other words, the plant‐associated bacteria that can release auxin are considered beneficial to their host plants.…”

Section: Discussionmentioning

confidence: 99%

Rhizospheric and endophyticPseudomonas aeruginosain edible vegetable plants share molecular and metabolic traits with clinical isolates

Ambreetha

Marimuthu

Mathee

et al. 2022

Journal of Applied Microbiology

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Aim: Pseudomonas aeruginosa, a leading opportunistic pathogen causing hospitalacquired infections, is also commonly found in agricultural settings. However, there are minimal attempts to examine the molecular and functional attributes shared by agricultural and clinical strains of P. aeruginosa. This study investigates the presence of P. aeruginosa in edible vegetable plants (including salad vegetables) and analyses the evolutionary and metabolic relatedness of the agricultural and clinical strains. Methods and Results:Eighteen rhizospheric and endophytic P. aeruginosa strains were isolated from cucumber, tomato, eggplant, and chili directly from the farms.The identity of these strains was confirmed using biochemical and molecular assays. The genetic and metabolic traits of these plant-associated P. aeruginosa isolates were compared with clinical strains. DNA fingerprinting and 16S rDNA-based phylogenetic analyses revealed that the plant-and human-associated strains are evolutionarily related. Both agricultural and clinical isolates possessed plant-beneficial properties, including mineral solubilization to release essential nutrients (phosphorous, potassium, and zinc), ammonification, and the ability to release extracellular pyocyanin, siderophore, and indole-3 acetic acid. Conclusion: These findings suggest that rhizospheric and endophytic P. aeruginosa strains are genetically and functionally analogous to the clinical isolates. In addition, the genotypic and phenotypic traits do not correlate with plant sources or ecosystems. Significance and Impact of the Study:This study reconfirms that edible plants are the potential source for human and animal transmission of P. aeruginosa.

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Section: Discussionmentioning

confidence: 99%

Rhizospheric and endophyticPseudomonas aeruginosain edible vegetable plants share molecular and metabolic traits with clinical isolates

Ambreetha

Marimuthu

Mathee

et al. 2022

Journal of Applied Microbiology

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“…Several strategies of PGPR are directly attributed to the proliferation of plant growth. The secretion of metabolites by rhizospheric bacteria such as phytohormones, OAs, few enzymes for nutrient solubilization, siderophores, antibiotics, hydrolytic enzymes, antifungal compounds, and other compounds like osmoprotectants improve plant health and also eliminate the proliferation of soil pathogens in the rhizosphere region (39,83,84). The root colonization by ZSB and their mediated secretion of OAs/siderophores in the rhizospheric region solubilize the inorganic Zn in a free or solubilizing form, which can be easily taken up by plant roots and translocated into several parts including edible parts or grains as an additional microbial-assisted biofortification step (Figure 2).…”

Section: Rhizospheric Region: a Hub For Zsb For A Direct Talk With The Host Plantmentioning

confidence: 99%

Cross Talk Between Zinc-Solubilizing Bacteria and Plants: A Short Tale of Bacterial-Assisted Zinc Biofortification

2022

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A contemporary approach to bacterially mediated zinc (Zn) biofortification offers a new dimension in the crop improvement program with better Zn uptake in plants to curb Zn malnutrition. The implication of Zn solubilizing bacteria (ZSB) represents an inexpensive and optional strategy for Zn biofortification, with an ultimate green solution to enlivening sustainable agriculture. ZSB dwelling in the rhizospheric hub or internal plant tissues shows their competence to solubilize Zn via a variety of strategies. The admirable method is the deposition of organic acids (OAs), which acidify the surrounding soil environment. The secretion of siderophores as a metal chelating molecule, chelating ligands, and the manifestation of an oxidative–reductive system on the bacterial cell membrane are further tactics of bacterially mediated Zn solubilization. The inoculation of plants with ZSB is probably a more effective tactic for enhanced Zn translocation in various comestible plant parts. ZSB with plant growth-enhancing properties can be used as bioelicitors for sustainable plant growth via the different approaches that are crucial for plant health and its productivity. This article provides an overview of the functional properties of ZSB-mediated Zn localization in the edible portions of food crops and provides an impetus to explore such plant probiotics as natural biofortification agents.

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“…We also evaluate siderophore production, phytate utilization and HCN production. Beside these specific PSB characteristics, auxin production and ACC deaminase activity, other interesting classical PGPR traits, were also explored according to their possible interest for root growth enhancement, and so potentiality to increase the volume of soil prospected by plants (Ambreetha and Balachandar, 2019;Richardson et al, 2009).…”

Section: Identification Of Potential Psb Strains From Investigated Soilsmentioning

confidence: 99%

Are native phosphate solubilizing bacteria a relevant alternative to mineral fertilizations for crops? Part I. when rhizobacteria meet plant P requirements.

et al. 2022

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Rhizobacteria-Mediated Root Architectural Improvement: A Hidden Potential for Agricultural Sustainability

Cited by 6 publications

References 79 publications

Rhizospheric and endophyticPseudomonas aeruginosain edible vegetable plants share molecular and metabolic traits with clinical isolates

Rhizospheric and endophyticPseudomonas aeruginosain edible vegetable plants share molecular and metabolic traits with clinical isolates

Cross Talk Between Zinc-Solubilizing Bacteria and Plants: A Short Tale of Bacterial-Assisted Zinc Biofortification

Are native phosphate solubilizing bacteria a relevant alternative to mineral fertilizations for crops? Part I. when rhizobacteria meet plant P requirements.

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