Leaf lettuce (<i>Lactuca sativa</i> L. ‘L-121’) growth in hydroponics with different nutrient solutions used to generate ultrafine bubbles

Kobayashi, Noriko; Yamaji, Keiko

doi:10.1080/01904167.2021.2006227

Cited by 8 publications

(5 citation statements)

References 46 publications

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“…At the same time, hydroxyl ions were preferentially adsorbed at the MNB air–water interface, accumulating negative charges . This then drew counterions, such as hydrogen ions and nutrient cations, including potassium, calcium, magnesium, and ammonium, toward the air–water interface, forming an electrical double layer. ,,, These “armored” MNBs could behave as nanoparticles, potentially facilitating nutrient translocation to the root zone, biofilms, and periphyton. , In conjunction with elevated DO concentrations, this creates an environment conducive to increased biomass in butterhead lettuce. Based on niche changes in the microenvironments of plant roots and aquaculture effluent, an enhancement of carbon–nitrogen cycling within the system was observed, as evidenced by the reduction in DOC concentrations and an increase in nitrate accumulation.…”

Section: Resultsmentioning

confidence: 99%

“…In the broader context, previous studies have explored the effects of MNBs on plants and noticed considerable variations in gene expression patterns among plant species, ,, noting significant variations in expression among different species. Wang et al studied the gene expression responses of Yellow iris ( Iris pseudacorus ) and Amazon sword ( Echinodorus amazonicus ) plants to NB and macrobubble treatments under similar DO concentrations.…”

Section: Resultsmentioning

confidence: 99%

“…109 This then drew counterions, such as hydrogen ions and nutrient cations, including potassium, calcium, magnesium, and ammonium, toward the air−water interface, forming an electrical double layer. 18,58,110,111 These "armored" MNBs could behave as nanoparticles, potentially facilitating nutrient translocation to the root zone, biofilms, and periphyton. 14,112 In conjunction with elevated DO concentrations, this creates an environment conducive to increased biomass in butterhead lettuce.…”

Section: Microbial Interactionsmentioning

confidence: 99%

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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: 99%

Section: Resultsmentioning

confidence: 99%

Section: Microbial Interactionsmentioning

confidence: 99%

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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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“…Some plants demonstrate high specificity toward different heavy metals. For example, Panicum aquaticu m, Gossypium spp , Paspalum conjugatum , and Chenopodium quinoa were specifically used to remove aqueous Pb, while Ipomoea aquatica , Pennisetum sinese , Brassica napus , and Chrysopogon zizanioides were used to remove Cr − an Zn. − …”

Section: Introductionmentioning

confidence: 99%

Physiological Changes and Antioxidative Mechanisms of Alternanthera philoxeroides in Phytoremediation of Cadmium

et al. 2023

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This study evaluated the physiological characteristics (e.g., growth parameters, chlorophyll content, metabolites and antioxidative enzymes activity) of Alternanthera philoxeroides (A. philoxeroides), as a hyperaccumulator plant, during the phytoremediation of cadmium (Cd) from water. After cultivating A. philoxeroides in a Cd-containing medium for 30 days, the growth rate was inhibited by up to 33.5% as the exposed Cd concentration increased to 0.80 mmol•L −1 . Cd exposure interfered with the photosynthesis of A. philoxeroides and caused oxidative stress as indicated by the rise of malondialdehyde (MDA) and H 2 O 2 , which increased by 8 times and 3 times compared to the control group. Moreover, high exposure concentrations of Cd also reduced the activities of multiple antioxidants (e.g., GSH and AsA), indicating the inhibition of Cd on the plant's ability to mitigate oxidative damage. Finally, the fluorescent patterns of the rhizosphere dissolved organic matter (rDOM) revealed three major components (humic, fulvic substances and protein-like substances) well correlated with the changes in antioxidant activities. Partial least-squares discriminant analysis (PLS-DA) visualized the difference in the activity of the antioxidative enzymes between different groups. The study unravelled deep insights into the potential mechanisms of tolerance and resistance of A. philoxeroides for phytoremediation of Cd pollution.

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“…It was also reported that microbubble generation in nutrient solutions promoted lettuce growth [ 9 ]. Additionally, it was found that the fresh and dry weights of shoots were higher in tap water with UFBs than in tap water without UFBs in another application of UFBs to lettuce production in hydroponic systems [ 10 ]. A similar effect was shown by Ebina et al, where the growth of Brassica campestris , cultured hydroponically for 4 weeks within air nanobubble water, was significantly promoted, compared to normal water [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Promotion Effects of Ultrafine Bubbles/Nanobubbles on Seed Germination

et al. 2023

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The number concentrations of air UFBs were controlled, approximately, by adjusting the generation time. UFB waters, ranging from 1.4 × 108 mL−1 to 1.0 × 109 mL−1, were prepared. Barley seeds were submerged in beakers filled with distilled water and UFB water in a ratio of 10 mL of water per seed. The experimental observations of seed germination clarified the role of UFB number concentrations; that is, a higher number concentration induced earlier seed germination. In addition, excessively high UFB number concentrations caused suppression of seed germination. A possible reason for the positive or negative effects of UFBs on seed germination could be ROS generation (hydroxyl radicals and ∙OH, OH radicals) in UFB water. This was supported by the detection of ESR spectra of the CYPMPO-OH adduct in O2 UFB water. However, the question still remains: how can OH radicals be generated in O2 UFB water?

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Leaf lettuce (Lactuca sativa L. ‘L-121’) growth in hydroponics with different nutrient solutions used to generate ultrafine bubbles

Cited by 8 publications

References 46 publications

Micronanobubble Aeration Enhances Plant Yield and Nitrification in Aquaponic Systems

Micronanobubble Aeration Enhances Plant Yield and Nitrification in Aquaponic Systems

Physiological Changes and Antioxidative Mechanisms of Alternanthera philoxeroides in Phytoremediation of Cadmium

Promotion Effects of Ultrafine Bubbles/Nanobubbles on Seed Germination

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