Browsing by Author "Rainer Borriss"

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Antimicrobial secondary metabolites from agriculturally important bacteria as next-generation pesticides
(Springer, 2020) Chetan Keswani; Harikesh B. Singh; Carlos García-Estrada; John Caradus; Ya-Wen He; Samia Mezaache-Aichour; Travis R. Glare; Rainer Borriss; Estibaliz Sansinenea
The whole organisms can be packaged as biopesticides, but secondary metabolites secreted by microorganisms can also have a wide range of biological activities that either protect the plant against pests and pathogens or act as plant growth promotors which can be beneficial for the agricultural crops. In this review, we have compiled information about the most important secondary metabolites of three important bacterial genera currently used in agriculture pest and disease management. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
Antimicrobial secondary metabolites from agriculturally important fungi as next biocontrol agents
(Springer, 2019) Chetan Keswani; Harikesh B. Singh; Rosa Hermosa; Carlos García-Estrada; John Caradus; Ya-Wen He; Samia Mezaache-Aichour; Travis R. Glare; Rainer Borriss; Francesco Vinale; Estibaliz Sansinenea
Synthetic chemical pesticides have been used for many years to increase the yield of agricultural crops. However, in the future, this approach is likely to be limited due to negative impacts on human health and the environment. Therefore, studies of the secondary metabolites produced by agriculturally important microorganisms have an important role in improving the quality of the crops entering the human food chain. In this review, we have compiled information about the most important secondary metabolites of fungal species currently used in agriculture pest and disease management. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
Auxins of microbial origin and their use in agriculture
(Springer Science and Business Media Deutschland GmbH, 2020) Chetan Keswani; Satyendra Pratap Singh; Laura Cueto; Carlos García-Estrada; Samia Mezaache-Aichour; Travis R. Glare; Rainer Borriss; Surya Pratap Singh; Miguel Angel Blázquez; Estibaliz Sansinenea
To maintain the world population demand, a sustainable agriculture is needed. Since current global vision is more friendly with the environment, eco-friendly alternatives are desirable. In this sense, plant growth–promoting rhizobacteria could be the choice for the management of soil-borne diseases of crop plants. These rhizobacteria secrete chemical compounds which act as phytohormones. Indole-3-acetic acid (IAA) is the most common plant hormone of the auxin class which regulates various processes of plant growth. IAA compound, in which structure can be found a carboxylic acid attached through a methylene group to the C-3 position of an indole ring, is produced both by plants and microorganisms. Plant growth–promoting rhizobacteria and fungi secrete IAA to promote the plant growth. In this review, IAA production and mechanisms of action by bacteria and fungi along with the metabolic pathways evolved in the IAA secretion and commercial prospects are revised. Key points • Many microorganisms produce auxins which help the plant growth promotion. • These auxins improve the plant growth by several mechanisms. • The auxins are produced through different mechanisms. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.
Bacillus spp. as Bio-factories for Antifungal Secondary Metabolites: Innovation Beyond Whole Organism Formulations
(Springer, 2023) Bruno Salazar; Aurelio Ortiz; Chetan Keswani; Tatiana Minkina; Saglara Mandzhieva; Satyendra Pratap Singh; Bhagwan Rekadwad; Rainer Borriss; Akansha Jain; Harikesh B. Singh; Estibaliz Sansinenea
Several fungi act as parasites for crops causing huge annual crop losses at both pre- and post-harvest stages. For years, chemical fungicides were the solution; however, their wide use has caused environmental contamination and human health problems. For this reason, the use of biofungicides has been in practice as a green solution against fungal phytopathogens. In the context of a more sustainable agriculture, microbial biofungicides have the largest share among the commercial biocontrol products that are available in the market. Precisely, the genus Bacillus has been largely studied for the management of plant pathogenic fungi because they offer a chemically diverse arsenal of antifungal secondary metabolites, which have spawned a heightened industrial engrossment of it as a biopesticide. In this sense, it is indispensable to know the wide arsenal that Bacillus genus has to apply these products for sustainable agriculture. Having this idea in our minds, in this review, secondary metabolites from Bacillus having antifungal activity are chemically and structurally described giving details of their action against several phytopathogens. Knowing the current status of Bacillus secreted antifungals is the base for the goal to apply these in agriculture and it is addressed in depth in the second part of this review. © 2022, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.
Bioengineering Bacillus spp. for Sustainable Crop Production: Recent Advances and Resources for Biotechnological Applications
(Springer, 2025) Aurelio Ortiz; Estibaliz Sansinenea; Keswani Chetan; Tatiana Mikhailovna Minkina; Satyendra Pratap Singh; Bhagwan Narayan Rekadwad; Rainer Borriss; Kathleen Laura Hefferon; Trinh Xuan Hoat; Debasis Mitra; Pradeep Kumar Das Mohapatra; Periyasamy Panneerselvam
The goal of sustainable agriculture is to meet the rising need for food, while minimizing adverse impacts on the environment, protecting natural resources, and ensuring agricultural output over the long term. The pressing need to increase agricultural yield through sustainable agriculture is being emphasized. Several Bacillus species have been used as commercial biopesticides since they can act against plant pathogens by potentially suppressing them. At the same time, they can act as plant growth-promoting rhizobacteria and are known for their diverse characteristics and beneficial properties, making them potential candidates for use sustainable crop production programs. Knowledge of genetic information opens the door of possibility for understanding the way these microorganisms behave. By applying biotechnological tools to Bacillus, strategies can be adopted for the purpose of increasing the yield of crops and managing pests and pathogens that infect them. In this review, we identify the genes in the most significant Bacillus spp. that contribute to plant improvement. The most important biotechnological tools and advance computational approaches are described to provide an extended vision on this topic. However, increasing the crop production through application of beneficial microbial strains requires a multifaceted approach that considers ecological, economic, and social aspects. By implementing these strategies and practices, we can work towards a sustainable and resilient agricultural system that meets the growing food demand, while preserving the environment for future generations. © The Author(s) 2024.
Bioengineering Bacillus spp. for Sustainable Crop Production: Recent Advances and Resources for Biotechnological Applications
(Springer, 2024) Aurelio Ortiz; Estibaliz Sansinenea; Chetan Keswani; Tatiana Minkina; Satyendra Pratap Singh; Bhagwan Rekadwad; Rainer Borriss; Kathleen Hefferon; Trinh Xuan Hoat; Debasis Mitra; Pradeep Kumar Das Mohapatra; Periyasamy Panneerselvam
The goal of sustainable agriculture is to meet the rising need for food, while minimizing adverse impacts on the environment, protecting natural resources, and ensuring agricultural output over the long term. The pressing need to increase agricultural yield through sustainable agriculture is being emphasized. Several Bacillus species have been used as commercial biopesticides since they can act against plant pathogens by potentially suppressing them. At the same time, they can act as plant growth-promoting rhizobacteria and are known for their diverse characteristics and beneficial properties, making them potential candidates for use sustainable crop production programs. Knowledge of genetic information opens the door of possibility for understanding the way these microorganisms behave. By applying biotechnological tools to Bacillus, strategies can be adopted for the purpose of increasing the yield of crops and managing pests and pathogens that infect them. In this review, we identify the genes in the most significant Bacillus spp. that contribute to plant improvement. The most important biotechnological tools and advance computational approaches are described to provide an extended vision on this topic. However, increasing the crop production through application of beneficial microbial strains requires a multifaceted approach that considers ecological, economic, and social aspects. By implementing these strategies and practices, we can work towards a sustainable and resilient agricultural system that meets the growing food demand, while preserving the environment for future generations. © The Author(s) 2024.
Biosynthesis and beneficial effects of microbial gibberellins on crops for sustainable agriculture
(Oxford University Press, 2022) Chetan Keswani; Satyendra P. Singh; Carlos García-Estrada; Samia Mezaache-Aichour; Travis R. Glare; Rainer Borriss; Vishnu D. Rajput; Tatiana M. Minkina; Aurelio Ortiz; Estibaliz Sansinenea
Soil microbes promote plant growth through several mechanisms such as secretion of chemical compounds including plant growth hormones. Among the phytohormones, auxins, ethylene, cytokinins, abscisic acid and gibberellins are the best understood compounds. Gibberellins were first isolated in 1935 from the fungus Gibberella fujikuroi and are synthesized by several soil microbes. The effect of gibberellins on plant growth and development has been studied, as has the biosynthesis pathways, enzymes, genes and their regulation. This review revisits the history of gibberellin research highlighting microbial gibberellins and their effects on plant health with an emphasis on the early discoveries and current advances that can find vital applications in agricultural practices. © 2021 The Society for Applied Microbiology.
Re-addressing the biosafety issues of plant growth promoting rhizobacteria
(Elsevier B.V., 2019) Chetan Keswani; Om Prakash; Nidhi Bharti; Juan I. Vílchez; Estibaliz Sansinenea; Richard D. Lally; Rainer Borriss; Surya P. Singh; Vijai K. Gupta; Leonardo F. Fraceto; Renata de Lima; Harikesh B. Singh
To promote agronomic sustainability, extensive research is being carried out globally, investigating biofertilizer development. Recently, it has been realized that some microorganisms used as biofertilizers behave as opportunistic pathogens and belong to the biosafety level 2 (BSL-2) classification. This poses serious risk to the environmental and human health. Evidence presented in various scientific forums is increasingly favoring the merits of using BSL-2 microorganisms as biofertilizers. In this review, we emphasize that partial characterization based on traditional microbiological approaches and small subunit rRNA gene sequences/conserved regions are insufficient for the characterization of biofertilizer strains. It is advised herein, that research and industrial laboratories developing biofertilizers for commercialization or environmental release must characterize microorganisms of interest using a multilateral polyphasic approach of microbial systematics. This will determine their risk group and biosafety characteristics before proceeding with formulation development and environmental application. It has also been suggested that microorganisms belonging to risk-group-1 and BSL-1 category should be used for formulation development and for field scale applications. While, BSL-2 microorganisms should be restricted for research using containment practices compliant with strict regulations. © 2019 Elsevier B.V.