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Benítez SV, Carrasco R, Giraldo JD, Schoebitz M. Microbeads as carriers for Bacillus pumilus: a biofertilizer focus on auxin production. J Microencapsul 2024; 41:170-189. [PMID: 38469757 DOI: 10.1080/02652048.2024.2324812] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Accepted: 02/19/2024] [Indexed: 03/13/2024]
Abstract
The study aimed to develop a solid biofertilizer using Bacillus pumilus, focusing on auxin production to enhance plant drought tolerance. Methods involved immobilising B. pumilus in alginate-starch beads, focusing on microbial concentration, biopolymer types, and environmental conditions. The optimal formulation showed a diameter of 3.58 mm ± 0.18, a uniform size distribution after 15 h of drying at 30 °C, a stable bacterial concentration (1.99 × 109 CFU g-1 ± 1.03 × 109 over 180 days at room temperature), a high auxin production (748.8 µg g-1 ± 10.3 of IAA in 7 days), and a water retention capacity of 37% ± 4.07. In conclusion, this new formulation of alginate + starch + L-tryptophan + B. pumilus has the potential for use in crops due to its compelling water retention, high viability in storage at room temperature, and high auxin production, which provides commercial advantages.
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Affiliation(s)
- Solange V Benítez
- Departamento de Suelos y Recursos Naturales, Facultad de Agronomía, Universidad de Concepción, Concepción, Chile
| | - Rocio Carrasco
- Departamento de Suelos y Recursos Naturales, Facultad de Agronomía, Universidad de Concepción, Concepción, Chile
| | - Juan D Giraldo
- Escuela de Ingeniería Ambiental, Instituto de Acuicultura, Universidad Austral de Chile, Sede Puerto Montt, Puerto Montt, Chile
| | - Mauricio Schoebitz
- Departamento de Suelos y Recursos Naturales, Facultad de Agronomía, Universidad de Concepción, Concepción, Chile
- Laboratory of Biofilms and Environmental Microbiology, Center of Biotechnology, University of Concepción, Concepción, Chile
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Upadhayay VK, Chitara MK, Mishra D, Jha MN, Jaiswal A, Kumari G, Ghosh S, Patel VK, Naitam MG, Singh AK, Pareek N, Taj G, Maithani D, Kumar A, Dasila H, Sharma A. Synergistic impact of nanomaterials and plant probiotics in agriculture: A tale of two-way strategy for long-term sustainability. Front Microbiol 2023; 14:1133968. [PMID: 37206335 PMCID: PMC10189066 DOI: 10.3389/fmicb.2023.1133968] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Accepted: 03/06/2023] [Indexed: 05/21/2023] Open
Abstract
Modern agriculture is primarily focused on the massive production of cereals and other food-based crops in a sustainable manner in order to fulfill the food demands of an ever-increasing global population. However, intensive agricultural practices, rampant use of agrochemicals, and other environmental factors result in soil fertility degradation, environmental pollution, disruption of soil biodiversity, pest resistance, and a decline in crop yields. Thus, experts are shifting their focus to other eco-friendly and safer methods of fertilization in order to ensure agricultural sustainability. Indeed, the importance of plant growth-promoting microorganisms, also determined as "plant probiotics (PPs)," has gained widespread recognition, and their usage as biofertilizers is being actively promoted as a means of mitigating the harmful effects of agrochemicals. As bio-elicitors, PPs promote plant growth and colonize soil or plant tissues when administered in soil, seeds, or plant surface and are used as an alternative means to avoid heavy use of agrochemicals. In the past few years, the use of nanotechnology has also brought a revolution in agriculture due to the application of various nanomaterials (NMs) or nano-based fertilizers to increase crop productivity. Given the beneficial properties of PPs and NMs, these two can be used in tandem to maximize benefits. However, the use of combinations of NMs and PPs, or their synergistic use, is in its infancy but has exhibited better crop-modulating effects in terms of improvement in crop productivity, mitigation of environmental stress (drought, salinity, etc.), restoration of soil fertility, and strengthening of the bioeconomy. In addition, a proper assessment of nanomaterials is necessary before their application, and a safer dose of NMs should be applicable without showing any toxic impact on the environment and soil microbial communities. The combo of NMs and PPs can also be encapsulated within a suitable carrier, and this method aids in the controlled and targeted delivery of entrapped components and also increases the shelf life of PPs. However, this review highlights the functional annotation of the combined impact of NMs and PPs on sustainable agricultural production in an eco-friendly manner.
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Affiliation(s)
- Viabhav Kumar Upadhayay
- Department of Microbiology, College of Basic Sciences & Humanities, Dr. Rajendra Prasad Central Agricultural University, Samastipur, Bihar, India
- *Correspondence: Viabhav Kumar Upadhayay,
| | - Manoj Kumar Chitara
- Department of Plant Pathology, College of Agriculture, A.N.D University of Agriculture and Technology, Ayodhya, Uttar Pradesh, India
- Manoj Kumar Chitara,
| | - Dhruv Mishra
- Department of Biological Sciences, College of Basic Sciences and Humanities, G.B. Pant University of Agriculture and Technology, Pantnagar, Uttarakhand, India
| | - Manindra Nath Jha
- Department of Microbiology, College of Basic Sciences & Humanities, Dr. Rajendra Prasad Central Agricultural University, Samastipur, Bihar, India
| | - Aman Jaiswal
- Department of Microbiology, College of Basic Sciences & Humanities, Dr. Rajendra Prasad Central Agricultural University, Samastipur, Bihar, India
| | - Geeta Kumari
- Department of Microbiology, College of Basic Sciences & Humanities, Dr. Rajendra Prasad Central Agricultural University, Samastipur, Bihar, India
| | - Saipayan Ghosh
- Department of Horticulture, PGCA, Dr. Rajendra Prasad Central Agricultural University, Samastipur, Bihar, India
| | - Vivek Kumar Patel
- Department of Plant Pathology, PGCA, Dr. Rajendra Prasad Central Agricultural University, Samastipur, Bihar, India
| | - Mayur G. Naitam
- Department of Microbiology, College of Basic Sciences & Humanities, Dr. Rajendra Prasad Central Agricultural University, Samastipur, Bihar, India
| | - Ashish Kumar Singh
- Department of Biotechnology and Synthetic Biology, Center of Innovative and Applied Bioprocessing, Sector 81, Mohali, India
| | - Navneet Pareek
- Department of Soil Science, College of Agriculture, G. B. Pant University of Agriculture and Technology, Pantnagar, India
| | - Gohar Taj
- Department of Molecular Biology & Genetic Engineering, College of Basic Sciences and Humanities, GBPUA&; T, Pantnagar, Uttarakhand, India
| | | | - Ankit Kumar
- Department of Horticulture, College of Agriculture, G. B. Pant University of Agriculture and Technology, Pantnagar, Uttarakhand, India
| | - Hemant Dasila
- Department of Microbiology, Akal College of Basic Sciences, Eternal University, Sirmaur, Himachal Pradesh, India
| | - Adita Sharma
- College of Fisheries, Dholi, Dr. Rajendra Prasad Central Agricultural University, Muzaffarpur, Bihar, India
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Adjuik TA, Nokes SE, Montross MD, Wendroth O. The Impacts of Bio-Based and Synthetic Hydrogels on Soil Hydraulic Properties: A Review. Polymers (Basel) 2022; 14:polym14214721. [PMID: 36365717 PMCID: PMC9656743 DOI: 10.3390/polym14214721] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Revised: 10/30/2022] [Accepted: 11/02/2022] [Indexed: 11/06/2022] Open
Abstract
Soil hydraulic properties are important for the movement and distribution of water in agricultural soils. The ability of plants to easily extract water from soil can be limited by the texture and structure of the soil, and types of soil amendments applied to the soil. Superabsorbent polymers (hydrogels) have been researched as potential soil amendments that could help improve soil hydraulic properties and make water more available to crops, especially in their critical growing stages. However, a lack of a comprehensive literature review on the impacts of hydrogels on soil hydraulic properties makes it difficult to recommend specific types of hydrogels that positively impact soil hydraulic properties. In addition, findings from previous research suggest contrasting effects of hydrogels on soil hydraulic properties. This review surveys the published literature from 2000 to 2020 and: (i) synthesizes the impacts of bio-based and synthetic hydrogels on soil hydraulic properties (i.e., water retention, soil hydraulic conductivity, soil water infiltration, and evaporation); (ii) critically discusses the link between the source of the bio-based and synthetic hydrogels and their impacts as soil amendments; and (iii) identifies potential research directions. Both synthetic and bio-based hydrogels increased water retention in soil compared to unamended soil with decreasing soil water pressure head. The application of bio-based and synthetic hydrogels both decreased saturated hydraulic conductivity, reduced infiltration, and decreased soil evaporation. Hybrid hydrogels (i.e., a blend of bio-based and synthetic backbone materials) may be needed to prolong the benefit of repeated water absorption in soil for the duration of the crop growing season.
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Affiliation(s)
- Toby A. Adjuik
- Department of Biosystems and Agricultural Engineering, University of Kentucky, Lexington, KY 40503, USA
- Correspondence:
| | - Sue E. Nokes
- Department of Biosystems and Agricultural Engineering, University of Kentucky, Lexington, KY 40503, USA
| | - Michael D. Montross
- Department of Biosystems and Agricultural Engineering, University of Kentucky, Lexington, KY 40503, USA
| | - Ole Wendroth
- Department of Plant & Soil Sciences, University of Kentucky, Lexington, KY 40503, USA
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