Nanotechnology for Nanophytopathogens: From Detection to the Management of Plant Viruses

Singh, Rachana; Kuddus, Mohammad; Singh, Pradhyumna Kumar; Choden, Deki

doi:https://doi.org/10.1155/2022/8688584

BioMed Research International

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Abstract Introduction Conclusion Conflicts of Interest Authors’ Contributions References Copyright Related Articles

Review Article | Open Access

Volume 2022 | Article ID 8688584 | https://doi.org/10.1155/2022/8688584

Nanotechnology for Nanophytopathogens: From Detection to the Management of Plant Viruses

Rachana Singh,¹Mohammad Kuddus,²Pradhyumna Kumar Singh,³and Deki Choden⁴

Academic Editor: Aqeel Ahmad

Received05 Jul 2022

Revised02 Sept 2022

Accepted03 Sept 2022

Published03 Oct 2022

Abstract

Plant viruses are the most destructive pathogens which cause devastating losses to crops due to their diversity in the genome, rapid evolution, mutation or recombination in the genome, and lack of management options. It is important to develop a reliable remedy to improve the management of plant viral diseases in economically important crops. Some reports show the efficiency of metal nanoparticles and engineered nanomaterials and their wide range of applications in nanoagriculture. Currently, there are reports for the use of nanoparticles as an antibacterial and antifungal agent in plants and animals too, but few reports as plant antiviral. “Nanophytovirology” has been emerged as a new branch that covers nanobased management approaches to deal with devastating plant viruses. Varied nanoparticles have specific physicochemical properties that help them to interact in various unique and useful ways with viruses and their vectors along with the host plants. To explore the antiviral role of nanoparticles and for the effective management of plant viruses, it is imperative to understand all minute details such as the concentration/dosage of nanoparticles, time of application, application interval, and their mechanism of action. This review focused on different aspects of metal nanoparticles and metal oxides such as their interaction with plant viruses to explore the antiviral role and the multidimensional perspective of nanotechnology in plant viral disease detection, treatment, and management.

1. Introduction

Food security has always been the priority and important agenda around the globe to feed the large population [1]. Food sustainability is encountering a serious threat due to the manifestation of devastating infections followed by diseases in cultivated plants [2–4]. Majorly, crop infections are caused by plant pathogens such as bacteria [5], fungi [6, 7], and viruses [8–12]. Phytoviruses have been reported for several decades as the most contagious pathogens which cause drastic effects on plants. Various scientists working in plant virology have given critical reviews which have demonstrated that the heavy crop losses are due to virus diseases [13–24]. This loss can be measured in terms of both quantity and quality of produce [25]. The proper management of virus diseases of plants is always been a matter of great concern from farmers to horticulturists, manufacturers to consumers, and foresters.

For decades, nanotechnology has proved its potential for the development of effective formulations [26–28], but due to the paucity of commercial applications and its role in agriculture has not gained popularity, various studies showed the use of nanoparticles as insecticides, fungicides, or herbicides and discussed the nanoparticle formulations against a target pest. There are two mechanisms for the application of nanoparticles to safeguard plants: (i) nanoparticles themselves provide crop protection and (ii) nanoparticles used as carriers for existing pesticides, for example, the application of double-stranded RNA, can be done by spray application on foliar tissue or on roots or soaking of seeds [29, 30]. In this review, we present a focused discussion on different aspects of nanoparticles in plant viral disease detection, treatment, management, and their interaction with plant viruses. The new term is also given to this study called “nanophytovirology.”

2. Nanoparticles and Their Application against Plant Pathogens

Nanoparticles (NPs) are small materials with nanosize ranging from 1 nm to 100 nm [31, 32] and are classified based on their shape or size and also (and most importantly) on their composition (Figure 1). The different class comprises metal NPs, ceramic NPs, polymeric NPs, and fullerenes. They show unique physiochemical properties due to their large surface-to-mass ratio, high reactivity, and unique interactions with biological systems [33]. Due to these unique properties and characteristics, they have gained attention in all fields from commercial to domestic, medical [34, 35] to agriculture [36], and environment [37, 38] to energy-based research [39–41]. The use of nanoparticles for sustainable agriculture was discussed in [31, 42, 43]. Different nanoparticles are used to design biosensors for the detection of plant disease, as the delivery vehicle for genetic materials [44], such as nanofertilizers and nanopesticides [28, 45].

The nanoparticles could be synthesized by three different methods: biological, physical, and chemical methods. Out of these, biological approaches are considered the best, due to their nontoxic effect, cost-effective, and environmentally friendly nature [46]. The method of synthesizing nanoparticles greatly influences their geometry and further affects the physiochemical properties like morphology, size, crystal structure, and dispersity. The biosynthetic method to synthesize nanoparticles by different methods and utilizing plants and microorganisms is very diverse. Preliminary microorganisms or plant extracts are exposed to metallic salts that in turn reduce the metal to its nanosize. The nanoparticles were further characterized and made available for further applications [47–49].

Numerous evaluations have been carried out that show the applications of nanoparticles related to plant diseases are either metalloids, metallic oxides, or nonmetals, involved in disease resistance as bactericide/fungicides or nanofertilizers (Table 1) [44, 50]. The metallic nanoparticles include pure metal and metal oxides [51]. The most popular metal nanoparticles comprise silver (Ag), gold (Au), platinum (Pt), nickel (Ni), and iron (Fe), and the metal oxide nanoparticle includes compounds such as TiO₂, ZnO, MgO, CuO, Cu₂O, Al₂O₃, NiO, and SnO₂ [52].

Phytoviruses are always being a challenge for farmers in terms of the production of crops and vegetables. There is a list of experiments that shows the application of different nanoparticles in bacterial and fungal diseases of plants; however, the focused study of nanoparticles on plant virus management is still in its preliminary stages, and the antiviral mechanisms of action of metal nanoparticles are not completely understood. The summary of published work and the available information concerning nanoparticles and plant viruses are gathered in Table 2.

The antiviral mechanism of NPs discussed in different studies and other different possible mechanisms (Figure 2) and the specific interactions between host (plant), vector (s), and pathogen (viruses) is summarized in (Figure 3, 4,and 5).

(a)

(b)

4. Antiviral Activity of Metallic Nanoparticles for Plants

To protect the plants from pathogen invasion, the nanomaterials can be applied directly either into the soil or to seeds or foliage. This direct application is similar to the use of chemical pesticides. However, direct application of nanoparticles to the soil directly affects microorganisms, especially nitrogen-fixing and mineral solubilizing which play a significant role in plant health and nutrition. Silver nanoparticles were the first to be used in plant disease management and showed their antimicrobial activity [53]. The nanoparticle’s interface with bacterial and fungal pathogens is studied very well but with viral particles is still not explored well, although some researchers studied the antiviral and virucidal mode of action of silver nanoparticles (AgNPs) against plant viruses [54–56].

The antiviral mechanisms of metal nanoparticles are not very well understood, but the available studies could provide evidence of the mechanisms involved. The antiviral activity of MeNPs has been observed both in vitro and in vivo on different plants, and it is found to be effective against most of the RNA viruses. Various studies revealed that physical properties like size, shape, and surface area are the key factors to control the biological activity of any nanoparticle [57, 58]. Reports revealed that the antibacterial activity of AgNPs is size-dependent. The small size (10 nm) of AgNPs has shown more antibacterial affinity in comparison to larger ones [59]. Furthermore, the variable antimicrobial activity of nanoparticles is influenced by the shape of nanoparticles (spherical, rod-shaped, nanoshells, nanocages, nanowires, triangular, and dimensional).

The impact of AgNPs on the Bean yellow mosaic virus (BYMV) was studied and reported that the antiviral property of NPs is due to their ability to attach to the envelope glycoprotein of the virus. It binds the disulfide bond regions of the CD4-binding domain present in the envelope glycoprotein gp120 of yellow mosaic virus and prevents entry [54]. Apart from their interaction with the surface glycoprotein of the virus, AgNPs also interact with the nucleic acid of the virus to enter into the cell and complete their antiviral activity. This experiment was intended to compare the impact of the spray of AgNPs before infection, 24 h after infection, and at the time of inoculation. Another work was also evidenced the high attachment capacity of nanoparticles of different sizes (10 and 50 nm), to virus DNA and extracellular virions. It was also observed that the AgNPs inhibited the production of viral RNA and extracellular virions in in vitro conditions, verified by UV-Vis absorption assay [60] and also found to restrict the fusion of the viral membrane by hindering viral permeation into the host cell [61].

Sun and his coworkers compared the AgNPs and gold nanoparticles and found AgNPs superior when used for cytoprotective activity towards the virus. It was a general observation that various forms of silver nanoparticles can inactivate viruses by denaturing enzymes through different reactions with self-hydra, amino, carboxyl, phosphate, and imidazole groups [62–66]. Dougdoug et al. [67] experimented with the effectiveness of AgNPs as an antiviral agent against two plant viruses, Potato virus Y (PVY) and Tomato mosaic virus (ToMV) and observed the effect. Different concentrations (50, 60, and 70 ppm) of AgNPs was sprayed on the plants carrying both diseases and at 50 ppm a concentration of AgNP the striking decrease in disease severity and concentration of both viruses was observed. Furthermore, the transmission electron microscopy (TEM) analysis of the viral sap substantiated the binding of coated protein particles of the virus to AgNPs [67]. Furthermore, a study on Sun-hemp rosette virus (SHRV) indicated complete suppression of the viral disease when spraying with AgNPs at the concentration of 50 mg/L. The detailed result showed the binding of these NPs with virus coat protein and virus inactivation is due to inhibition of virus replication [68].

The antiviral effect of AgNPs was observed against Tomato spot wilt virus (TSWV) on Chenopodium amaranticolor. Plants sprayed 24 h after inoculation showed weak infection in comparison to plants sprayed before inoculation [69]. Similar result, reduction in virus concentration and disease percentage, was reported by El-shazly et al. on potato plants against Tomato bushy stunt virus (TBSV) [70], while Cyamopsis tetragonoloba, infected with Sun-hemp rosette virus (SHRV), displayed complete suppression of the disease and inactivation of virus replication [68]. The antiviral effect of ZnO and SiO₂ NPs was studied on tobacco plants against TMV by Cai et al. Both NPs were applied on 3, 7, and 12 days before inoculation of virus. The plant treated 12-days before displayed an extreme antiviral effect by preventing TMV infection and spreading in new leaves [71]. Findings of his work suggest that the inhibition of TMV is due to interaction of metal NPs with envelope glycoproteins, resulting injury of TMV coat protein, and its aggregation. Hao et al. used Fe₂O₃ or TiO₂NPs for pretreatment of tobacco plants for 21 days to check the antiviral properties against Turnip mosaic virus (TuMV). The results of the study showed a high decrease in viral proteins, in which the authors suggest could be related to the fact that the NPs interfered with either protein biosynthesis or posttranslational modification processes in the virus, and activated defense mechanisms [72]. Various reports confirmed its action against plant viruses as it successfully induced resistance to mosaic disease impeded by the virus in potato, alfalfa, cucumber, peanut, and snuff [72–74]. Malerba and Cerana reported various conceivable mechanisms of chitosan that precede the antimicrobial effects that includes disruption of the cell membrane, inhibition of toxin production and microbial growth, inhibition of H+ -ATPase activity, and preventing the synthesis of mRNA and proteins. Furthermore, their studies revealed the antiviral action of chitosan nanoparticles in bean plants infected with bean mild mosaic virus, tobacco plants infected with tobacco necrosis virus and tobacco mosaic virus [75].

Adeel et al. worked on Nicotiana benthamiana plants and given the treatment at different concentrations of titanium dioxide (TiO2) and silver (Ag) nanoparticles, C60 fullerenes, and carbon nanotubes (CNTs) at 100, 200, and 500 mg/L and observed for a 21-day foliar exposure before inoculation of Tobacco mosaic virus (TMV). Plants treated with CNTs and C60 (200 mg/L) exhibited normal phenotype, and viral symptomology was not evident at 5 days postinfection, whereas TiO2 and Ag NP-treated plants show no sign of virus infection suppression [76].

5. Nanotechnology in Diagnostics of Plant Viruses

Many molecular and serological techniques, viz., polymerase chain reaction (PCR), real time PCR, immunological assays such as Enzyme-linked immunosorbent assay (ELISA), and electrochemical immunoassay (ECIA), are being used for diagnostics and identification of plant viral pathogens [32, 77–80]. Although these techniques are efficiently and effectively detecting plant pathogens, it requires well-established laboratory settings with high-end equipment and chemical, well-trained/experienced individuals. With fast-developing technology, the hour demands to develop rapid, accurate, reliable, and miniaturized field-deployable devices which do not demand a very trained personnel [81]. The success of any management practice depends on the quick, early, and sensitive diagnostic of the infected material. Nanotechnology recommends major progress through quick and very sensitive pathogen probes in this area. Nanotechnology has gained a pace in the diagnostics of plant pathogens. Nanoparticles are being used as rapid diagnostic tools for the detection of bacterial, fungal, and nematodes, and very few reports [82, 83] are there in the diagnostics of plant virus disease. The use of superparamagnetic iron oxide nanoparticles has been used in medicine and water purification for decades [84, 85], but now, it has taken advancement, and its potential is being recently been explored in plant pathology. These magnetic nanoparticles adhere to the biological tissue and DNA, eventually facilitating the extraction and detection of the pathogen [86].

5.1. Biosensor-Based Detection

The device designed to detect the occurrence of any biological analyte, such as a biomolecule, a biological structure, or a microorganism, is known as biosensors. It consists of three parts: (i) a section that identifies the analyte and produces a signal, (ii) a signal transducer, and (iii) a reader device [87]. Various nanomaterials, basic metallic nanoparticles (carbon and gold nanoparticles), and nanospheres enhance the sensitivity of the assay when used in combination with aptamer-based detection systems.

5.2. Antibody-Based Detection

In recent years, various reports have manifested the antibody-based detection of plant viruses [88–90]. James and Lin et al. developed nanobased biosensors for the detection of the Lettuce mosaic virus, Cowpea mosaic virus, and tobacco mosaic virus with twofold increase of the sensitivity of detection in comparison to traditional methods of ELISA [89, 90]. Indirect ELISA was applied for the detection of Cucumber mosaic virus (CMV) by Jiao et al. This method of ELISA consists of three steps: (i) fixation of virus antigen on the surface, (ii) treatment with specific antibodies for the detection of the virus, and (iii) incubation with an enzyme and horse shoe peroxidase- (HRP-) labeled secondary antibody. The reaction was monitored by the mercury electrode. This electrochemical enzyme-linked immunoassay (ECEIA) sensor-based method showed four times higher sensitivity in the detection of CMV in comparison to the standard spectrophotometric ELISA. This was also observed with other plant viruses such as Turnip mosaic virus (TuMV), Tobacco mosaic virus (TMV), Potato virus Y (PVY), Southern bean mosaic virus (SBMV), and Tomato aspermy virus (ToAV).

In the case of immunosensors, self-assembled monolayers (SAM) were used for diagnostics of plant pathogens. In this method, gold electrodes are the most commonly used substrate for the detection of Plum pox virus (PPV) [91]. Later on, Jarocka et al. in 2013 applied the same method for the diagnostic of Prunus necrotic ringspot virus (PNRSV) and concluded that the biosensor has alike similarity as ELISA [92]. Another biosensor-based plant virus detection was discussed by Huang et al. [93]. He used the quartz crystal microbalance immune sensor that was based on SAMs for identification of Maize chlorotic mottle virus (MCMV). The sensitivity of the biosensor was found to be similar to ELISA with a detection limit of 250 ng/mL and showed high sensitivity with similar viruses such as Wheat streak mosaic virus (WSMV) [93]. Lateral flow immunoassay (LFIA), a type of optical immunosensor, was initially used by Tsuda et al. [94] for the detection of the Tobacco mosaic virus (TMV). Later on, this method was employed for the diagnostic of several other viruses, Citrus tristeza virus (CTV) [95], Potato virus X (PVX) [96], Potato virus x [97], Potato virus Y (PVY), Potato virus M (PVM), and Potato virus A (PVA) with a reported sensitivity of 2 ng/mL.

An immunoassay is reported to be developed for the detection of multiple substances such as biomarkers and plant pathogens that function based on fluorescence-loaded magnetic microspheres and fluorophore antibodies [98, 99]. A study has been conducted using specific antibodies for plant viruses, Chilli vein-banding mottle virus (CVbMV), Watermelon silver mottle virus (WSMoV), and Melon yellow spot virus (MYSV) [100]. Although the techniques have shown high sensitivity for detection along with the capacity of multiple detections in a single assay, they did not become very popular due to the complexity of assays and fluorescent readers. Various reports mentioned the use of label-free biosensors, based on SPR, developed for the detection of CMV, TMV, and Lettuce mosaic virus [101–104] and for orchid viruses, Cymbidium mosaic virus (CymMV) or Odontoglossum ringspot virus (ORSV) [90]. Table 3 summarizes the application of different biosensors for the detection of various plant viruses.

5.3. Plant Virus Detection Based on Quantum Dots (QD)

Quantum dots (QD) are small semiconductor nanocrystals that have been used for the construction of biosensors [105]. It has been used for disease detection as it consists of a unique optical property that is used in fluorescence resonance energy transfer (FRET) [106]. Rad et al. used this approach for the detection of phytoplasma disease known as Witches’ broom disease of lime (WBDL) caused by Candidatus Phytoplasma aurantifolia [107]. The consistent result with 100% specificity and sensitivity was achieved by this approach for approximately 5 Candidatus Phytoplasma aurantifolia per μL. This technique was applied to detect Rhizoctonia, the disease vector of the Beet necrotic yellow vein virus (BNYVV) [108].

6. Metal Nanoparticles as Biostimulants in Virus-Infected Plants

Biostimulants are substances that enhance the physiological process of plants and promote growth, development, and defense responses. When applied directly to plants or seeds, they cannot be considered pesticides or nutrients [109]. The positive or negative effect of nanoparticles on the plant is based on the type of nanoparticles and the condition of the plant [110, 111]. Healthy tobacco plants were studied for the effect of SiO₂, Fe₂O₃, and ZnO nanoparticles and observed to have increased growth [112, 113]. When the effect of NiONPs was observed on the virus-infected cucumber plants by foliar spray and soil drench, it showed an increased number of leaves along with higher fresh and dry weight [114]. The tobacco plant infected with Turnip mosaic virus was being treated with foliar spray of TiO2 and FeO3 with the concentration of 50 mg/L and observed with enhanced fresh and dry weight, whereas no effect was observed with the treatment of 200 mg/L in comparison to nontreated plants [115]. When the Potato virus Y-infested tubers were treated with AgNPs, they have shown improved quality parameters in comparison to infected but not treated plants. The reason may be the provocation of resistance or the effect of nanoparticles on virus entry [70, 113].

7. NPs as an Option to Control of Plant Viral Pathogens

7.1. Application of NPs in Plant Defense Induction and Viral Repression

7.1.1. Antioxidant System

Under stress conditions (biotic or abiotic), the plant response is observed by increased reactive oxygen species (ROS) that limits the entry of the pathogen and its dissemination and stimulates local and systemic defense responses [71]. When the ROS level increases than the threshold, oxidative stress is being produced and this interrupts the steadiness between ROS and antioxidants. The role of antioxidants in plants is to counterpoise the antioxidants effect. Superoxide dismutase (SOD) acts as the initial boundary of defense and coverts the O₂ into water and H₂O₂ [113, 114]. The enzymes like catalase, ascorbate peroxidase, and guaiacol peroxidase make antioxidant systems [113]. The type of metal nanoparticles, their concentration, and the culture type define the interaction of metal nanoparticles with cellular redox homeostasis and alter the incident of oxidative stress inducing or reducing it [114]. The foliar application of Fe₃O₄ NPs to tobacco leaves resulted in enhanced production of ROS, which indicates the stimulation of resistance against the virus in tobacco [71]. When cucumber plants were treated with SiO₂ NP, they displayed the expression of pox and pal genes a day after inoculation of PRSV [116]. A similar observation was reported, with increased pod gene expression, when cucumber plants were treated with NiO NPs, after four days of CMV inoculation [112]. The AgNP-treated tomato plants when inoculated with TMV and PVY revealed a major increase in the activity of enzymes such as polyphenol oxidase and antioxidant enzyme POD [67, 117].

7.1.2. Plant Hormones and Pathogenesis-Related Proteins

Plant hormones play important roles in the defense mechanism of the plant. The phytohormones like salicylic acid (SA), jasmonic acid (JA), and ethylene are the key factors to regulate pathways involved in the defense mechanism and induce appropriate responses. The other phytohormones which can modulate plant defense and responses are auxins, cytokinins, gibberellin, abscisic acid, brassinosteroids, and strigolactone. Different hormonal pathways are up- or downregulated in different types of stress. Nanoparticles have been shown to stimulate hormonal balance in plants [110]. Various studies and discussions concluded that the expression of any particular plant hormone is completely dependent on the particular interaction of plant and metal nanoparticles together with the dose and time of application. Vincovi’c et al. reported that treatment of Capsicum annum L plants with AgNPs increases cytokinin [117]. Tobacco plants infested with TMV, when given the treatment of Fe₂O₃ and TiO₂ NPs, influence the levels of zeatin, ribose (ZR), abscisic acid, and brassinosteroid (BR) phytohormones [115]. When the treatment of similar nanoparticles was given to tobacco, plants infected with TuMV showed an enhanced level of BR and ZR, but the decrease in ABA concentration was observed. Various other reports suggest that treatment of ZnO and SiO₂ [111] to uninfected tobacco plants upregulated salicylic acid- (SA-) induced pathogenesis and a similar effect was reported for Fe₃O₄ NPs [111].

8. Conclusion

Nanophytovirology is a very promising field towards sustainable crop protection against viruses. The different nanoparticles and their applications have tremendous potential to deal with plant virus disease-related problems. Among plant viruses, DNA plant viruses specially geminiviruses [118] are a continuous threat to farmers and cause a serious threat to the crops [12, 119]. It consists of a very wide host range, with varied symptoms. Geminivirus constitutes a major and rapidly emerging group [120, 121] of circular, single-stranded plant viruses. Various countries like the United States, Africa, India, and Pakistan have reported large crop losses due to geminivirus infection, worth several million dollars [10, 122, 123]. Moreover, the effect of nanomaterials in the tripartite interaction of plant-viruses-vector is still not known. Although various roles and uses have already been studied, precise complementary methodologies are needed to establish so that a ready-to-use technology could be given to farmers without posing any risk to the environment or consumers. This additional information and knowledge are required to particularize the doses, the stage of the plant for application, and the particular type of NPs that can produce the greatest advantages. In addition, the effect of nanoparticles on the virus-vector relationship also needs to be explored, whether it is dose-dependent or stage-dependent. It is important to say that for sustainable management of phytoviruses, the multidisciplinary research is required with proper planning, development, and implementation of nanobased antiviral strategies.

Conflicts of Interest

There is no conflict of interest.

Authors’ Contributions

All authors contributed to the article and approved the submitted version. Rachana Singh and Deki Choden were involved in designing, conception, and revising of the manuscript critically for intellectual content. Mohammad Kuddus and Pradhyumna Kumar Singh were involved in critically examining the manuscript and incorporation important relevant information.

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Copyright © 2022 Rachana Singh et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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BioMed Research International

Nanotechnology for Nanophytopathogens: From Detection to the Management of Plant Viruses

Abstract

1. Introduction

2. Nanoparticles and Their Application against Plant Pathogens

3. Systematic Facets of Nanomaterials as Antiviral Agents

4. Antiviral Activity of Metallic Nanoparticles for Plants

5. Nanotechnology in Diagnostics of Plant Viruses

5.1. Biosensor-Based Detection

5.2. Antibody-Based Detection

5.3. Plant Virus Detection Based on Quantum Dots (QD)

6. Metal Nanoparticles as Biostimulants in Virus-Infected Plants

7. NPs as an Option to Control of Plant Viral Pathogens

7.1. Application of NPs in Plant Defense Induction and Viral Repression

7.1.1. Antioxidant System

7.1.2. Plant Hormones and Pathogenesis-Related Proteins

8. Conclusion

Conflicts of Interest

Authors’ Contributions

References

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