The fate of plant growth-promoting rhizobacteria in soilless agriculture: future perspectives

Azizoğlu, Uğur; Yılmaz, Nihat; Şimşek, Özhan; Ibal, Jerald Conrad; Tagele, Setu Bazie; Shin, Jae‐Ho

doi:10.1007/s13205-021-02941-2

Cited by 28 publications

(25 citation statements)

References 97 publications

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“…Even the candidates from the sole genus behave erratically to a specific antibiotic 51 , 52 . T heir behavior towards antibiotics like rifampicin, erythromycin, polymyxin-B, and amikacin has been observed similarly earlier 53 . All isolated bacterial endophytes grew in induced drought and elevated temperature mediated stress.…”

Section: Discussionsupporting

confidence: 60%

Dynamics, phylogeny and phyto-stimulating potential of chitinase synthesizing bacterial root endosymbiosiome of North Western Himalayan Brassica rapa L.

Padder

Rather

Bhat

et al. 2022

Sci Rep

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The less phytopathogen susceptibility in Himalayan Brassica rapa L. has made it an exceptional crop eluding synthetic pesticide inputs, thereby guarantying economically well-founded and ecologically sustainable agriculture. The relevance of niche microflora of this crop has not been deliberated in this context, as endosymbiosiome is more stable than their rhizosphere counterparts on account of their restricted acquaintance with altering environment; therefore, the present investigation was carried out to study the endophytic microfloral dynamics across the B. rapa germplasm in context to their ability to produce chitinase and to characterize the screened microflora for functional and biochemical comportments in relevance to plant growth stimulation. A total of 200 colonies of bacterial endophytes were isolated from the roots of B. rapa across the J&K UT, comprising 66 locations. After morphological, ARDRA, and sequence analysis, eighty-one isolates were selected for the study, among the isolated microflora Pseudomonas sp. Bacillus sp. dominated. Likewise, class γ-proteobacteria dominated, followed by Firmicutes. The diversity studies have exposed changing fallouts on all the critical diversity indices, and while screening the isolated microflora for chitinase production, twenty-two strains pertaining to different genera produced chitinase. After carbon source supplementation to the chitinase production media, the average chitinase activity was significantly highest in glycerol supplementation. These 22 strains were further studied, and upon screening them for their fungistatic behavior against six fungal species, wide diversity was observed in this context. The antibiotic sensitivity pattern of the isolated strains against chloramphenicol, rifampicin, amikacin, erythromycin, and polymyxin-B showed that the strains were primarily sensitive to chloramphenicol and erythromycin. Among all the strains, only eleven produced indole acetic acid, ten were able to solubilize tricalcium phosphate and eight produced siderophores. The hydrocyanic acid and ammonia production was observed in seven strains each. Thus, the present investigation revealed that these strains could be used as potential plant growth promoters in sustainable agriculture systems besides putative biocontrol agents.

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Section: Discussionsupporting

confidence: 60%

Dynamics, phylogeny and phyto-stimulating potential of chitinase synthesizing bacterial root endosymbiosiome of North Western Himalayan Brassica rapa L.

Padder

Rather

Bhat

et al. 2022

Sci Rep

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“…These beneficial microorganisms, which enhance the resistance to biotic and abiotic stress factors in plants, are prevalent near plant roots in an area called the rhizosphere and include the following genera: Alcaligenes, Mesorhizobium, Rhizobium, Rhodococcus, Azospirillum, Azotobacter, Agrobacterium, Bacillus, Bradyrhizobium, Burkholderia, Caulobacter, Chromobacterium, Enterobacter, Herbaspirillum, Klebsiella, Micrococcus, Pseudomonas, Arthrobacter, Erwinia, Flavobacterium, and Serratia. PGPR can be divided into symbiotic bacteria (living within plant tissues and exchanging metabolites) and free-living rhizobacteria (living outside of plant tissues and promoting plant growth) based on their interactions with plants [213]. Owing to their beneficial effects on plant health by suppressing phytopathogens and accelerating nutrient assimilation, among the bacteria investigated for biocontrol, increased attention was given to actinobacteria.…”

Section: Trichoderma Sppmentioning

confidence: 99%

Biostimulants in Viticulture: A Sustainable Approach against Biotic and Abiotic Stresses

Cataldo

Fucile

Mattii

2022

Plants

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Climate change and disproportionate anthropogenic interventions, such as the excess of phytopharmaceutical products and continuous soil tillage, are jeopardizing viticulture by subjecting plants to continuous abiotic stress. One of the main physiological repercussions of abiotic stress is represented by the unbalanced redox homeostasis due to the overproduction of reactive oxygen species (ROS), ultimately leading to a state of oxidative stress (detrimental to grape quality). To these are added the direct and indirect damages caused by pathogens (biotic stresses). In light of this scenario, it is inevitable that sustainable techniques and sensitivity approaches for environmental and human health have to be applied in viticulture. Sustainable viticulture can only be made with the aid of sustainable products. Biostimulant (PB) applications (including resistance inducers or elicitors) in the vineyard have become interesting maneuvers for counteracting vine diseases and improving grape quality. These also represent a partial alternative to soil fertilization by improving nutrient absorption and avoiding its leaching into the groundwater. Their role as elicitors has important repercussions in the stimulation of the phenylpropanoid pathway by triggering the activation of several enzymes, such as polyphenol oxidase, lipoxygenase, phenylalanine ammonia-lyase, and peroxidase (with the accumulation of phenolic compounds). The present review paper summarizes the PBs’ implications in viticulture, gathering historical, functional, and applicative information. This work aims to highlight the innumerable beneficial effects on vines brought by these products. It also serves to spur the scientific community to a greater contribution in investigating the response mechanisms of the plant to positive inductions.

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“…Just like in soils, the effectivity of PGPR amendment in hydroponic systems depends on their ability to establish in these specific environments [22]. Since environmental conditions are controlled in hydroponic systems, microbes are more likely to persist [92]. Several studies report a positive effect of PGPRs on plant growth, disease control, and biotic stress alleviation in hydroponic systems [92,93].…”

Section: Plant Growth-promoting Rhizobacteria Amendment To Improve Vertical Farm Circularity and Resiliencementioning

confidence: 99%

“…Since environmental conditions are controlled in hydroponic systems, microbes are more likely to persist [92]. Several studies report a positive effect of PGPRs on plant growth, disease control, and biotic stress alleviation in hydroponic systems [92,93]. For example, lettuce showed improved growth in the presence of Bacillus spp.…”

Section: Plant Growth-promoting Rhizobacteria Amendment To Improve Vertical Farm Circularity and Resiliencementioning

confidence: 99%

“…PGPR applications have been shown to stabilize the root-associated microbiome even when only a small proportion of the inoculated microbes could successfully colonize the root zone [96]. For a recent overview of PGPRs that have been successfully applied in hydroponics, we refer to Azizoglu et al [92] and Lee and Lee [93].…”

Section: Plant Growth-promoting Rhizobacteria Amendment To Improve Vertical Farm Circularity and Resiliencementioning

confidence: 99%

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Vertical Farming: The Only Way Is Up?

2021

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Vertical farming is on its way to becoming an addition to conventional agricultural practices, improving sustainable food production for the growing world population under increasing climate stress. While the early development of vertical farming systems mainly focused on technological advancement through design innovation, the automation of hydroponic cultivation, and advanced LED lighting systems, more recent studies focus on the resilience and circularity of vertical farming. These sustainability objectives are addressed by investigating water quality and microbial life in a hydroponic cultivation context. Plant growth-promoting rhizobacteria (PGPR) have been shown to improve plant performance and resilience to biotic and abiotic stresses. The application of PGPRs to plant-growing media increases microbial functional diversity, creating opportunities to improve the circularity and resilience of vertical farming systems by reducing our dependency on chemical fertilizers and crop protection products. Here, we give a brief historical overview of vertical farming, review its opportunities and challenges in an economic, environmental, social, and political context, and discuss advances in exploiting the rhizosphere microbiome in hydroponic cultivation systems.

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The fate of plant growth-promoting rhizobacteria in soilless agriculture: future perspectives

Cited by 28 publications

References 97 publications

Dynamics, phylogeny and phyto-stimulating potential of chitinase synthesizing bacterial root endosymbiosiome of North Western Himalayan Brassica rapa L.

Dynamics, phylogeny and phyto-stimulating potential of chitinase synthesizing bacterial root endosymbiosiome of North Western Himalayan Brassica rapa L.

Biostimulants in Viticulture: A Sustainable Approach against Biotic and Abiotic Stresses

Vertical Farming: The Only Way Is Up?

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