Biocontrol of Phytopathogens under Aquaponics Systems

Rivas-García, Tomás; González-Estrada, Ramsés Ramón; Chiquito-Contreras, Roberto G.; Pérez, Juan José Reyes; González-Salas, Uriel; Hernández-Montiel, Luis Guillermo; Murillo-Amador, Bernardo

doi:10.3390/w12072061

Cited by 10 publications

(9 citation statements)

References 108 publications

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“…In addition, L. minor has gained popularity in aquaculture and wastewater treatment processes, either as a supplemental protein resource for feeding domestic animals and fish (Ekperusi et al 2019), or as a biological filter to reduce harmful substances (Velichkova and Sirakov 2013). In this respect, aquatic (and terrestrial) plants may be cultivated under modified or artificial light conditions, potentially with elevated UVB irradiance for phytopathogen control (Suthaparan et al 2017;Rivas-García et al 2020). In such cases, plants may temporarily receive high UVB irradiance without prior acclimation, a condition which might induce physiological changes in the plants that affect biomass production.…”

Section: Introductionmentioning

confidence: 99%

Effects of artificial ultraviolet B radiation on the macrophyte Lemna minor: a conceptual study for toxicity pathway characterization

Xie

Solhaug

Shang

et al. 2020

Planta

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Main conclusion UVB radiation caused irradiance-dependent and target-specific responses in non-UVB acclimated Lemna minor. Conceptual toxicity pathways were developed to propose causal relationships between UVB-mediated effects at multiple levels of biological organisation. Abstract Macrophytes inhabit waterways around the world and are used in hydroponics or aquaponics for different purposes such as feed and wastewater treatment and are thus exposed to elevated levels of UVB from natural and artificial sources. Although high UVB levels are harmful to macrophytes, mechanistic understanding of irradiance-dependent effects and associated modes of action in non-UVB acclimated plants still remains low. The present study was conducted to characterise the irradiance-dependent mechanisms of UVB leading to growth inhibition in Lemna minor as an aquatic macrophyte model. The L. minor were continuously exposed to UVB (0.008–4.2 W m−2) and constant UVA (4 W m−2) and photosynthetically active radiation, PAR (80 µmol m−2 s−1) for 7 days. A suite of bioassays was deployed to assess effects on oxidative stress, photosynthesis, DNA damage, and transcription of antioxidant biosynthesis, DNA repair, programmed cell death, pigment metabolism and respiration. The results showed that UVB triggered both irradiance-dependent and target-specific effects at multiple levels of biological organization, whereas exposure to UVA alone did not cause any effects. Inhibition of photosystem II and induction of carotenoids were observed at 0.23 W m−2, whereas growth inhibition, excessive reactive oxygen species, lipid peroxidation, cyclobutane pyrimidine dimer formation, mitochondrial membrane potential reduction and chlorophyll depletion were observed at 0.5–1 W m−2. Relationships between responses at different levels of biological organization were used to establish a putative network of toxicity pathways to improve our understanding of UVB effects in aquatic macrophytes under continuous UVB exposures. Additional studies under natural illuminations were proposed to assess whether these putative toxicity pathways may also be relevant for more ecologically relevant exposure scenarios.

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Section: Introductionmentioning

confidence: 99%

Effects of artificial ultraviolet B radiation on the macrophyte Lemna minor: a conceptual study for toxicity pathway characterization

Xie

Solhaug

Shang

et al. 2020

Planta

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“…When added to water, it reacts with the formation of Cland O + for strong oxidization of any organic material. Sodium hypochlorite is an effective agent against a number of pathogens such as Fusarium spp., but it is not effective against viruses [186].…”

Section: Microbial Pathogen Control In Aquaponic Systemsmentioning

confidence: 99%

“…This is an inexpensive but inefficient method useful for cleaning rather than disinfection. Nevertheless, doses of 0.01 to 0.005% are effective against Pythium spp., Fusarium spp, and other fungi [186,187]. Sodium hypochlorite (NaOCl) is an inexpensive and widely used chemical product for water treatment, especially in swimming pools [187].…”

Section: Microbial Pathogen Control In Aquaponic Systemsmentioning

confidence: 99%

Microbial Pathogens in Aquaponics Potentially Hazardous for Human Health

Dinev,

Velichkova,

Stoyanova

et al. 2023

Microorganisms

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The union of aquaculture and hydroponics is named aquaponics—a system where microorganisms, fish and plants coexist in a water environment. Bacteria are essential in processes which are fundamental for the functioning and equilibrium of aquaponic systems. Such processes are nitrification, extraction of various macro- and micronutrients from the feed leftovers and feces, etc. However, in aquaponics there are not only beneficial, but also potentially hazardous microorganisms of fish, human, and plant origin. It is important to establish the presence of human pathogens, their way of entering the aforementioned systems, and their control in order to assess the risk to human health when consuming plants and fish grown in aquaponics. Literature analysis shows that aquaponic bacteria and yeasts are mainly pathogenic to fish and humans but rarely to plants, while most of the molds are pathogenic to humans, plants, and fish. Since the various human pathogenic bacteria and fungi found in aquaponics enter the water when proper hygiene practices are not applied and followed, if these requirements are met, aquaponic systems are a good choice for growing healthy fish and plants safe for human consumption. However, many of the aquaponic pathogens are listed in the WHO list of drug-resistant bacteria for which new antibiotics are urgently needed, making disease control by antibiotics a real challenge. Because pathogen control by conventional physical methods, chemical methods, and antibiotic treatment is potentially harmful to humans, fish, plants, and beneficial microorganisms, a biological control with antagonistic microorganisms, phytotherapy, bacteriophage therapy, and nanomedicine are potential alternatives to these methods.

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“…Piñero et al 2023 [55] report that using plant growth-promoting bacteria such as Azotobacter and Azospirillum improves mineral absorption, the efficiency of nitrogen utilization, and plant development. Sirakov et al (2016) [57] and other researchers [58][59][60] report on the control of pathogens by using nutrient competition and the production of secondary metabolites such as antibiotics through the inoculation of Bacillus spp., Saccharomyces, and Lactobacillus spp. The present study provides other exciting findings to optimize the mineralization or release of nutrients by applying L. mangiferihumi.…”

Section: Effect Of L Mangiferihumi On the Release Of Macro-and Micron...mentioning

confidence: 99%

Isolation and Identification of Lysinibacillus sp. and Its Effects on Solid Waste as a Phytate-Mineralizing Bacterium in an Aquaponics System

Riaño-Castillo,

Rodríguez-Ortiz,

Kim

et al. 2024

Horticulturae

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Sedimentable solids generated in aquaponic systems are mainly composed of organic waste, presenting molecules such as phytate, which can be a potential source of inorganic nutrients through mineralization. This work aimed to isolate and identify phytase-producing bacteria and evaluate the inoculation effects of pure strains on mineralization and nutrient release from solid waste generated in aquaponic systems at different oxygen and temperature conditions. The bacteria were isolated from the settleable solids of a commercial aquaponic system and molecularly identified by amplifying the 16S rRNA gene. Subsequently, two tests were carried out: 1. Test for the biochemical identification of phytase-producing bacteria; 2. In vitro mineralization test, where the ability to mineralize phytate and release nutrients under different oxygen conditions [0 rpm (2.1 mg L−1) and 200 rpm (7.8 mg L−1)] and temperatures (24 and 37 °C) were evaluated. Our findings show that two pure strains of Lysinibacillus mangiferihumi can mineralize phytate under conditions of 200 rpm and 24 °C, mainly increasing the mineralization of PO4- and Ca, a property that has not yet been reported for this species. On the other hand, at 0 rpm and 24 °C, an increase in K was observed (control conditions), while the conditions of 200 rpm and 24 °C, regardless of bacterial inoculation, favored a rise in S, Mg, and Fe. The Lysinibacillus strains obtained in this investigation are of great importance due to their application in agriculture and the optimization of mineralization in aquaponic systems. A proper combination of oxygen and temperature will lead to a greater availability of nutrients for the growth and development of vegetables.

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Biocontrol of Phytopathogens under Aquaponics Systems

Cited by 10 publications

References 108 publications

Effects of artificial ultraviolet B radiation on the macrophyte Lemna minor: a conceptual study for toxicity pathway characterization

Effects of artificial ultraviolet B radiation on the macrophyte Lemna minor: a conceptual study for toxicity pathway characterization

Microbial Pathogens in Aquaponics Potentially Hazardous for Human Health

Isolation and Identification of Lysinibacillus sp. and Its Effects on Solid Waste as a Phytate-Mineralizing Bacterium in an Aquaponics System

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