Browsing by Author "Saglara Mandzhieva"

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Arsenic remediation through sustainable phytoremediation approaches
(MDPI, 2021) Sudhakar Srivastava; Anurakti Shukla; Vishnu D. Rajput; Kundan Kumar; Tatiana Minkina; Saglara Mandzhieva; Antonina Shmaraeva; Penna Suprasanna
Arsenic contamination of the environment is a serious problem threatening the health of millions of people exposed to arsenic (As) via drinking water and crops grown in contaminated areas. The remediation of As-contaminated soil and water bodies needs to be sustainable, low-cost and feasible to apply in the most affected low-to-middle income countries, like India and Bangladesh. Phytoremediation is an aesthetically appreciable and successful approach that can be used for As decontamination with use of the best approach(es) and the most promising plant(s). However, phytoremediation lacks the required speed and sometimes the stress caused by As could diminish plants’ potential for remediation. To tackle these demerits, we need augment plants’ potential with appropriate technological methods including microbial and nanoparticles applications and genetic modification of plants to alleviate the As stress and enhance As accumulation in phytoremediator plants. The present review discusses the As phytoremediation prospects of soil and water bodies and the usefulness of various plant systems in terms of high biomass, high As accumulation, bioenergy potential, and economic utility. The potential and prospects of assisted phytoremediation approaches are also presented. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
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.
Coping with the challenges of abiotic stress in plants: New dimensions in the field application of nanoparticles
(MDPI AG, 2021) Vishnu D. Rajput; Tatiana Minkina; Arpna Kumari; Harish; Vipin Kumar Singh; Krishan K. Verma; Saglara Mandzhieva; Svetlana Sushkova; Sudhakar Srivastava; Chetan Keswani
Abiotic stress in plants is a crucial issue worldwide, especially heavy-metal contami-nants, salinity, and drought. These stresses may raise a lot of issues such as the generation of reactive oxygen species, membrane damage, loss of photosynthetic efficiency, etc. that could alter crop growth and developments by affecting biochemical, physiological, and molecular processes, causing a significant loss in productivity. To overcome the impact of these abiotic stressors, many strategies could be considered to support plant growth including the use of nanoparticles (NPs). However, the majority of studies have focused on understanding the toxicity of NPs on aquatic flora and fauna, and relatively less attention has been paid to the topic of the beneficial role of NPs in plants stress response, growth, and development. More scientific attention is required to understand the behavior of NPs on crops under these stress conditions. Therefore, the present work aims to comprehensively review the beneficial roles of NPs in plants under different abiotic stresses, especially heavy metals, salinity, and drought. This review provides deep insights about mechanisms of abiotic stress alleviation in plants under NP application. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Efficient Catalytic Degradation of Selected Toxic Dyes by Green Biosynthesized Silver Nanoparticles Using Aqueous Leaf Extract of Cestrum nocturnum L.
(MDPI, 2022) Pradeep Kumar; Jyoti Dixit; Amit Kumar Singh; Vishnu D. Rajput; Pooja Verma; Kavindra Nath Tiwari; Sunil Kumar Mishra; Tatiana Minkina; Saglara Mandzhieva
In the present study, the catalytic degradation of selected toxic dyes (methylene blue, 4-nitrophenol, 4-nitroaniline, and congo red) using biosynthesized green silver nanoparticles (AgNPs) of Cestrum nocturnum L. was successfully performed. These AgNPs are efficiently synthesized when a reaction mixture containing 5 mL of aqueous extract (3%) and 100 mL of silver nitrate (1 mM) is exposed under sunlight for 5 min. The synthesis of AgNPs was confirmed based on the change in the color of the reaction mixture from pale yellow to dark brown, with maximum absorbance at 455 nm. Obtained NPs were characterized by different techniques, i.e., FTIR, XRD, HR-TEM, HR-SEM, SAED, XRD, EDX, AFM, and DLS. Green synthesized AgNPs were nearly mono-dispersed, smooth, spherical, and crystalline in nature. The average size of the maximum number of AgNPs was 77.28 ± 2.801 nm. The reduction of dyes using a good reducing agent (NaBH4) was tested. A fast catalytic degradation of dyes took place within a short period of time when AgNPs were added in the reaction mixture in the presence of NaBH4. As a final recommendation, Cestrum nocturnum aqueous leaf extract-mediated AgNPs could be effectively implemented for environmental rehabilitation because of their exceptional performance. This can be utilized in the treatment of industrial wastewater through the breakdown of hazardous dyes. © 2022 by the authors.
Insights into the Biosynthesis of Nanoparticles by the Genus Shewanella
(American Society for Microbiology, 2021) Vishnu D. Rajput; Tatiana Minkina; Richard L. Kimber; Vipin Kumar Singh; Sudhir Shende; Arvind Behal; Svetlana Sushkova; Saglara Mandzhieva; Jonathan R. Lloyd
The exploitation of microorganisms for the fabrication of nanoparticles (NPs) has garnered considerable research interest globally. The microbiological transformation of metals and metal salts into respective NPs can be achieved under environmentally benign conditions, offering a more sustainable alternative to chemical synthesis methods. Species of the metal-reducing bacterial genus Shewanella are able to couple the oxidation of various electron donors, including lactate, pyruvate, and hydrogen, to the reduction of a wide range of metal species, resulting in biomineralization of a multitude of metal NPs. Singlemetal- based NPs as well as composite materials with properties equivalent or even superior to physically and chemically produced NPs have been synthesized by a number of Shewanella species. A mechanistic understanding of electron transfer-mediated bioreduction of metals into respective NPs by Shewanella is crucial in maximizing NP yields and directing the synthesis to produce fine-tuned NPs with tailored properties. In addition, thorough investigations into the influence of process parameters controlling the biosynthesis is another focal point for optimizing the process of NP generation. Synthesis of metal-based NPs using Shewanella species offers a low-cost, eco-friendly alternative to current physiochemical methods. This article aims to shed light on the contribution of Shewanella as a model organism in the biosynthesis of a variety of NPs and critically reviews the current state of knowledge on factors controlling their synthesis, characterization, potential applications in different sectors, and future prospects. © 2021 American Society for Microbiology.
Nano-biochar: A novel solution for sustainable agriculture and environmental remediation
(Academic Press Inc., 2022) Vishnu D. Rajput; Tatiana Minkina; Bilal Ahmed; Vipin Kumar Singh; Saglara Mandzhieva; Svetlana Sushkova; Tatiana Bauer; Krishan K. Verma; Shengdao Shan; Eric D. van Hullebusch; Bing Wang
Currently, the applications of biochar (BC) in agricultural practices and for environmental remediation purposes have demonstrated multifaceted advantages despite a few limitations. Nano-BC offers considerable opportunities especially for the remediation of hazardous contaminants as well as the improvement of crop productivity. Positive outcomes of nano-BC on soil physico-chemical and biological characteristics have indicated its suitability for agricultural applications. Nano-BC may effectively regulate the mobilization and sorption of important micro- and macro-nutrients, along with the hazardous contaminants including potentially toxic metals, pesticides, etc. Additionally, the sorption characteristics of nano-BC depends substantially on feedstock materials and pyrolysis temperatures. Nevertheless, the conducted investigations regarding nano-BC are in infant stages, requiring extensive field investigations. The nano-enhanced properties of BC on one hand dramatically improve its effectiveness and sustainability, on the other hand, there may be associated with toxicity development in diverse aquatic and/or terrestrial environments. Therefore, risk assessment on soil organisms and its indirect impact on human health is another area of concern linked with the field application of nano-BC. The present review delineates the potentiality of nano-BC as an emerging sorbent for sustainable agriculture and environmental applications. © 2022 Elsevier Inc.
Nanomaterials and biochar mediated remediation of emerging contaminants
(Elsevier B.V., 2024) Priyadarshani Rajput; Pradeep Kumar; A.K. Priya; Smita Kumari; Seyede Roghie Ghadirnezhad Shiade; Vishnu D. Rajput; Amin Fathi; Arunava Pradhan; Rubab Sarfraz; Svetlana Sushkova; Saglara Mandzhieva; Tatiana Minkina; Alexander Soldatov; Ming Hung Wong; Christopher Rensing
The unrestricted release of various toxic substances into the environment is a critical global issue, gaining increased attention in modern society. Many of these substances are pristine to various environmental compartments known as contaminants/emerging contaminants (ECs). Nanoparticles and emerging sorbents enhanced remediation is a compelling methodology exhibiting great potential in addressing EC-related issues and facilitating their elimination from the environment, particularly those compounds that demonstrate eco-toxicity and pose considerable challenges in terms of removal. It provides a novel technique enabling the secure and sustainable removal of various ECs, including persistent organic compounds, microplastics, phthalate, etc. This extensive review presents a critical perspective on the current advancements and potential outcomes of nano-enhanced remediation techniques such as photocatalysis, nano-sensing, nano-enhanced sorbents, bio/phyto-remediation, which are applied to clean-up the natural environment. In addition, when dealing with residual contaminants, special attention is paid to both health and environmental implications; therefore, an evaluation of the long-term sustainability of nano-enhanced remediation methods has been considered. The integrated mechanical approaches were thoroughly discussed and presented in graphical forms. Thus, the critical evaluation of the integrated use of most emerging remediation technologies will open a new dimension in environmental safety and clean-up program. © 2024 Elsevier B.V.
Phenolic Compounds of the Medicinal Plants in an Anthropogenically Transformed Environment
(Multidisciplinary Digital Publishing Institute (MDPI), 2023) Natalya Vinogradova; Elena Vinogradova; Victor Chaplygin; Saglara Mandzhieva; Pradeep Kumar; Vishnu D. Rajput; Tatiana Minkina; Chandra Shekhar Seth; Marina Burachevskaya; Dionise Lysenko; Rupesh Kumar Singh
In this article, the impact of an anthropogenically transformed environment on the content of pharmaceutically valuable biologically active compounds in medicinal plants is analyzed. The studied biologically active substances included phenolic compounds (flavonoids, anthocyanins, tannins, and phenolic acids). The number of transmissible forms of heavy metals (HMs), including cadmium, lead, and mercury, were discharged from factories that are present in the soil. Plants uptake these toxic metals from the soil. HM causes changes in the activity of the several enzymes such as phenylalanine ammonia lyase (PAL), chalcone synthase (CHS), chalcone isomerase (CHI) and other enzymes. These enzymes play an important role in biosynthesis of phenolic compounds in medicinal plants. It has been demonstrated that plant materials possess high antioxidant potential due to their high phenolic content. As a result, the present review discusses a thorough investigation of anthropogenically transformed environment effects on the quantity of pharmaceutically valuable phenolic compounds in medicinal plants. © 2023 by the authors.
Plant growth-promoting rhizobacteria: a potential bio-asset for restoration of degraded soil and crop productivity with sustainable emerging techniques
(Springer, 2023) Sudhir K. Upadhyay; Vishnu D. Rajput; Arpna Kumari; Daniel Espinosa-Saiz; Esther Menendez; Tatiana Minkina; Padmanabh Dwivedi; Saglara Mandzhieva
The rapid expansion of degraded soil puts pressure on agricultural crop yield while also increasing the likelihood of food scarcity in the near future at the global level. The degraded soil does not suit plants growth owing to the alteration in biogeochemical cycles of nutrients, soil microbial diversity, soil organic matter, and increasing concentration of heavy metals and organic chemicals. Therefore, it is imperative that a solution should be found for such emerging issues in order to establish a sustainable future. In this context, the importance of plant growth-promoting rhizobacteria (PGPR) for their ability to reduce plant stress has been recognized. A direct and indirect mechanism in plant growth promotion is facilitated by PGPR via phytostimulation, biofertilizers, and biocontrol activities. However, plant stress mediated by deteriorated soil at the field level is not entirely addressed by the implementation of PGPR at the field level. Thus, emerging methods such as CRISPR and nanotechnological approaches along with PGPR could manage degraded soil effectively. In the pursuit of the critical gaps in this respect, the present review discusses the recent advancement in PGPR action when used along with nanomaterials and CRISPR, impacting plant growth under degraded soil, thereby opening a new horizon for researchers in this field to mitigate the challenges of degraded soil. © 2022, The Author(s), under exclusive licence to Springer Nature B.V.
Sustainable Amelioration of Heavy Metals in Soil Ecosystem: Existing Developments to Emerging Trends
(MDPI, 2022) Garima Awasthi; Varad Nagar; Saglara Mandzhieva; Tatiana Minkina; Mahipal Singh Sankhla; Pritam P. Pandit; Vinay Aseri; Kumud Kant Awasthi; Vishnu D. Rajput; Tatiana Bauer; Sudhakar Srivastava
The consequences of heavy metal contamination are progressively degrading soil quality in this modern period of industry. Due to this reason, improvement of the soil quality is necessary. Remediation is a method of removing pollutants from the root zone of plants in order to minimize stress and increase yield of plants grown in it. The use of plants to remove toxins from the soil, such as heavy metals, trace elements, organic chemicals, and radioactive substances, is referred to as bioremediation. Biochar and fly ash techniques are also studied for effectiveness in improving the quality of contaminated soil. This review compiles amelioration technologies and how they are used in the field. It also explains how nanoparticles are becoming a popular method of desalination, as well as how they can be employed in heavy metal phytoremediation. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.
The Content of Heavy Metals in Medicinal Plants in Various Environmental Conditions: A Review
(MDPI, 2023) Natalya Vinogradova; Alexander Glukhov; Victor Chaplygin; Pradeep Kumar; Saglara Mandzhieva; Tatiana Minkina; Vishnu D. Rajput
Nowadays people are becoming poisoned through the consumption of herbal remedies that comprise heavy metals (HMs) worldwide. It is possible for HMs to be present in pharmaceutical herb materials coming from anthropogenic activities like agriculture, industrial waste, and natural sources. In various ethnic groups, there is evidence that contaminants were purposefully added in the belief that they had some sort of therapeutic benefit. HM toxicity of medicinal plant products has been linked to a wide range of adverse health effects, causing dysfunction of the liver, kidney, and heart, and even death. Natural plant-based products established around the world have progressed to the point that they now combine a variety of synthetic products for their purported medical benefits. This assessment focuses on the impacts of HMs on plants, sources of HMs, herbal sample collection, and identification techniques, especially in medicinal plant samples. At the same time, it focuses on the sociocultural applications of HMs as well as the dangers associated with their usage in conventional therapies. It is necessary to implement appropriate regulation and monitoring systems for natural supplements due to the prevalence of hazardous HMs. © 2023 by the authors.
Trichoderma viride—Mediated Modulation of Oxidative Stress Network in Potato Challenged with Alternaria solani
(Springer, 2023) Sumit Kumar; Ram Chandra; Chetan Keswani; Tatiana Minkina; Saglara Mandzhieva; Marina Voloshina; Mukesh Meena
Potato is a staple food crop cultivated globally. Heavy losses to potato production are reported annually due to soil borne phytopathogens. Trichoderma viride is a potential biocontrol agent that improves host defense. In the present study, potato tubers bio-primed with T. viride were studied for its effect on growth promotion and modulation of antioxidant system as well as defense-related enzymes in potato plants when challenged with Alternaria solani. Potato tubers treated with T. viride and after 45 days of sowing, plants were challenged with pathogen. Significant improvement in various growth parameters was recorded in bio-primed plants. While, in pathogen-challenged plants, an enhanced intracellular concentration of H2O2 and O2− was observed. Interestingly, T. viride when applied with pathogen, significantly improved the redox homeostasis by modulating the antioxidant enzyme activities. The significant induction of defense enzymes and free phenolic content suggested that T. viride-treated plants provide enhanced protection from oxidative stress induced during A. solani challenge via. elevated accumulation of antioxidant enzymes, polyphenolic compounds, and defense-related enzymes. © 2022, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.