Plant Beneficial Bacteria and Their Potential Applications in Vertical Farming Systems

Chiaranunt, Peerapol; White, James F.

doi:10.3390/plants12020400

Cited by 20 publications

(13 citation statements)

References 229 publications

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“…An increase in DO concentration allows plant roots to respire more efficiently, resulting in increased ATP production . This higher energy availability supports the growth and development of roots and improves a plant’s nutrient and water uptake capabilities. − Moreover, as the root biomass increases, it extends its surface area, providing a conducive habitat for nutrient remineralization, nitrification, and the proliferation of microbes associated with plant growth . This hypothesis is supported by water quality data (Section ) and microbial community analysis in the roots, which indicated a higher abundance of Proteobacteria (Section ).…”

Section: Resultsmentioning

confidence: 77%

“…52−55 Moreover, as the root biomass increases, it extends its surface area, providing a conducive habitat for nutrient remineralization, nitrification, and the proliferation of microbes associated with plant growth. 56 This hypothesis is supported by water quality data (Section 3.2.3) and microbial community analysis in the roots, which indicated a higher abundance of Proteobacteria (Section 3.3.2).…”

Section: Resultsmentioning

confidence: 77%

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Micronanobubble Aeration Enhances Plant Yield and Nitrification in Aquaponic Systems

Marcelino,

Wongkiew,

Shitanaka

et al. 2023

ACS EST Eng.

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Aquaponics is a climate-smart food production system that relies on nutrient recovery from aquaculture effluent. The availability of dissolved oxygen (DO) limits the performance of aquaponic systems. To address this issue, air micronanobubbles (MNBs) were tested as an alternative aeration method. Due to their small size (<50 μm) and long-term stability, MNBs can enhance the gas−liquid mass transfer of oxygen and maintain DO concentrations above saturation, enhancing aerobic biochemical processes. Through 16S rRNA gene metabarcoding and water quality analyses, we investigated the influence of continuous MNB aeration on DO concentrations and carbon−nitrogen cycling. Our results indicated that continuous MNB aeration (K L a 20 = 7.76 ± 0.38 h −1 ) in the grow bed of an aquaponic system increased DO concentrations to 9.31 ± 1.57 mg L −1 without affecting other system components. In comparison, aeration with a conventional diffuser (K L a 20 = 1.73 ± 0.54 h −1 ) maintained lower DO concentrations of 6.32 ± 0.32 mg L −1 on average. Further benefits of MNBs include higher reductions in total solids (16 ± 2%) and volatile solids (32 ± 2%) and an increase in nitrate concentrations over time. Notably, MNB aeration enhanced the total butterhead lettuce yield and root biomass per plant by 35 ± 8% and 20 ± 5%, respectively. While MNB aeration reshaped the microbial community and potentially disturbed certain microbial symbiotic relationships (e.g., Denitratisoma, Thermomonas, and Nitrospira), the overall metabolic pathways remained largely intact. Overall, our study provides insights into the application of MNB aeration to enhance plant biomass production in floating raft aquaponic systems and increase nitrification and remineralization.

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Section: Resultsmentioning

confidence: 77%

Section: Resultsmentioning

confidence: 77%

Micronanobubble Aeration Enhances Plant Yield and Nitrification in Aquaponic Systems

Marcelino,

Wongkiew,

Shitanaka

et al. 2023

ACS EST Eng.

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“…The majority of these metabolites are formed through complex pathways, such as polypropanoids, alkaloids, and polyketides. The beneficial interactions between plants and microbes are facilitated by chemical mediators such as terpenoids, flavonoids, and ethylene, which are induced in response to particular triggers [ 22 , 26 ].…”

Section: Connected Plant Microbiomementioning

confidence: 99%

The Microbial Connection to Sustainable Agriculture

Nadarajah

Rahman

2023

Plants

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Microorganisms are an important element in modeling sustainable agriculture. Their role in soil fertility and health is crucial in maintaining plants’ growth, development, and yield. Further, microorganisms impact agriculture negatively through disease and emerging diseases. Deciphering the extensive functionality and structural diversity within the plant–soil microbiome is necessary to effectively deploy these organisms in sustainable agriculture. Although both the plant and soil microbiome have been studied over the decades, the efficiency of translating the laboratory and greenhouse findings to the field is largely dependent on the ability of the inoculants or beneficial microorganisms to colonize the soil and maintain stability in the ecosystem. Further, the plant and its environment are two variables that influence the plant and soil microbiome’s diversity and structure. Thus, in recent years, researchers have looked into microbiome engineering that would enable them to modify the microbial communities in order to increase the efficiency and effectiveness of the inoculants. The engineering of environments is believed to support resistance to biotic and abiotic stressors, plant fitness, and productivity. Population characterization is crucial in microbiome manipulation, as well as in the identification of potential biofertilizers and biocontrol agents. Next-generation sequencing approaches that identify both culturable and non-culturable microbes associated with the soil and plant microbiome have expanded our knowledge in this area. Additionally, genome editing and multidisciplinary omics methods have provided scientists with a framework to engineer dependable and sustainable microbial communities that support high yield, disease resistance, nutrient cycling, and management of stressors. In this review, we present an overview of the role of beneficial microbes in sustainable agriculture, microbiome engineering, translation of this technology to the field, and the main approaches used by laboratories worldwide to study the plant–soil microbiome. These initiatives are important to the advancement of green technologies in agriculture.

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“…Bacillus, Pseudomonas, and Azospirillum are the most extensively studied genera for their effectiveness as growth promoters in soilless cultivation systems (Figure 4), with species such as Bacillus subtilis, Bacillus licheniformis, Pseudomonas fluorescens, and Azospirillum brasilense among the most commonly tested (Table 1). These PGPM have demonstrated their ability to solubilize nutrients, which is particularly promising for increasing nutrient reuse efficiency in soilless systems, such as hydroponics and aquaponics [19]. In hydroponics, soil-related issues such as phosphate precipitation can also occur.…”

Section: Pgpm As Plant-promoting Growth Treatment and Facilitation Of...mentioning

confidence: 99%

Introducing the Power of Plant Growth Promoting Microorganisms in Soilless Systems: A Promising Alternative for Sustainable Agriculture

Mourouzidou

Ντίνας²,

Tsaballa³

et al. 2023

Sustainability

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Soilless systems, such as hydroponics and aquaponics, are gaining popularity as a sustainable alternative to traditional soil-based agriculture, aiming at maximizing plant productivity while minimizing resource use. Nonetheless, the absence of a soil matrix poses challenges that require precise management of nutrients, effective control of salinity stress, and proactive strategies to master disease management. Plant growth-promoting microorganisms (PGPM) have emerged as a promising solution to overcome these issues. Research demonstrated that Bacillus, Pseudomonas, and Azospirillum are the most extensively studied genera for their effectiveness as growth promoters, inducing changes in root architecture morphology. Furthermore, PGPM inoculation, either alone or in synergy, can reverse the effects of nutrient deficiency and salt stress. The genera Pseudomonas and Trichoderma were recognized for their solid antagonistic traits, which make them highly effective biocontrol agents in hydroponic systems. The latest findings indicate their ability to significantly reduce disease severity index (DSI) through mycoparasitism, antibiosis, and induced systemic resistance. In aquaponic systems, the inoculation with Bacillus subtilis and Azospirillum brasilense demonstrated increased dissolved oxygen, improving water quality parameters and benefiting plant and fish growth and metabolism. This review also establishes the interaction variability between PGPM and growing media, implying the specificity for determining inoculation strategies to maximize the productivity of soilless cultivation systems. These findings suggest that using PGPM in soil-free settings could significantly contribute to sustainable crop production, addressing the challenges of nutrient management, disease control, and salinity issues.

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Plant Beneficial Bacteria and Their Potential Applications in Vertical Farming Systems

Cited by 20 publications

References 229 publications

Micronanobubble Aeration Enhances Plant Yield and Nitrification in Aquaponic Systems

Micronanobubble Aeration Enhances Plant Yield and Nitrification in Aquaponic Systems

The Microbial Connection to Sustainable Agriculture

Introducing the Power of Plant Growth Promoting Microorganisms in Soilless Systems: A Promising Alternative for Sustainable Agriculture

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