Nano-Management of Farming under Salinity Stress: Comparison
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Please note this is a comparison between Version 1 by Hassan Ragab El-Ramady and Version 2 by Lindsay Dong.

Soil salinity is a serious global problem that threatens a high percentage of the global soils. Salinity stress can create ionic, oxidative, and osmotic stress, along with hormonal imbalances, in stressful plants. Application of nanomaterials for ameliorating salinity stress has gained great attention due to their high efficiency, eco-friendliness, and non-toxicity, especially biological nanomaterials. The application of nanomaterials (NMs) did not only support growing stressful plants under salinity stress but also increased the yield of crops, provided an economically feasible nutrient management approach, and was environmentally robust for sustainable crop productivity. Nano-management of salinity may involve applying traditional nano-amendments, biological nanomaterials, nano-enabled nutrients, nano-organic amendments, derived smart nanostructures, and nano-tolerant plant cultivars.

  • nano-gypsum
  • nanoparticles
  • nanotoxicity nanofarming
  • plant growth regulators
  • salt stress

1. Introduction

Nanotechnology, as one of the largest growing technologies in the world, is considered a sustainable approach for overcoming several challenges in both the agroecosystem and the environment [1][2]. Many nano-applications in agriculture through different nanotools were confirmed, such as nanofertilizers, nanosensors, nano-amendments, and nano-pesticides, which have successfully transformed conventional farming methods into precision farming [3]. Several nano-formulations of traditional agricultural inputs, including mainly conventional fertilizers and pesticides, have been transformed into nanofertilizers and nanopesticides [4]. At the farm level, farmers are seeking to improve their agricultural practices by using nano-based materials (mainly fertilizers and pesticides), which can promote the efficiency and productivity of cultivated crops, especially under stress [3][5]. Some common nanomaterials that can be applied in agriculture for crop production are listed in Figure 13, which also shows the positive and presumed negative impacts of these nanomaterials, and their application methods are presented as well. Generally, many negative effects of applied nanomaterials (NMs) might be on crop production, including inhibited uptake and transport of both water and nutrients, generating ROS, causing dose-dependent genotoxicity, DNA damage, and cell death [6]. Soil salinity can also be managed by using many sources of nanomaterials [7][8] (Figure 24).
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Figure 13. A list of the most common nanoparticles (NPs) and nanomaterials (NMs) (part 1) that can be applied in agriculture for crop production through different methods (part 2). The positive and presumed negative impacts of these nanomaterials and their application methods are presented as well in parts 3 and 4. Sources: from different refs., referring to the text.
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Figure 24. The main target of nanomanagement of soil salinity (part I) and different suggested approaches (part II), which include traditional, biological, and other derived smart nanomaterials. Sources: [7][8].
Nano-management of soil salinity can be achieved through many approaches, which mainly aim to enhance plant growth, its tolerance to salinity stress, and improvements in soil structure and quality [7][8]. These approaches may include applying traditional methods (nano-gypsum, nano-hydroxyapatite, nano-sulfur, etc.), nano-nutrients (nano-calcium, nano-selenium, nano-silicon, nano-ZnO, etc.), nano-amendments (nanobiochar, nano-compost, nano-chitosan, etc.), and nano-halophytes and salt-tolerant genotypes [6][9][10][11][12]. Carbon nanomaterials against stress on crops were also investigated, including many carbon-NMs such as carbon nanotubes, carbon nanodots, nanographene, and nanofullerene [13]. Furthermore, zero-valent iron-NP (nZVI) and nanobiofertilizers, or biological nanofertilizers, are also effective approaches to mitigating soil salinity [14][15][16]. 

2. Nano-Management of Farming under Salinity Stress

2.1. Nano-Agrochemicals

Due to the incredible increase in global population and limited crop production, more than 800 million people are currently undernourished, and this will reach more than 2 billion people by 2050 [17]. In this situation, there is an urgent need to increase global agro-production by more than 70% in the next few decades, which requires more applications of agrochemicals (mainly fertilizers, pesticides, and plant growth regulators) for higher crop production to meet this global demand [18]. Every year, there is an over 2.5% increase in the global market of agrochemicals, which are directly linked to crop protection, as reported in 2017, to over 55 billion dollars [17]. These agrochemicals may be used for protecting cultivated crops from diseases (pesticides) or for increased crop production (chemical fertilizers). Several studies confirmed the potential of nano-based agrochemicals in agriculture (mainly in soil and plants) and the main factors controlling the fate and uptake of nano-agrochemicals by plants from soil (Figure 35). These studies focused on the toxicity of nano-based agrochemicals on non-target aquatic species [17], on plant-associated microbiomes [19], smart agrochemical nanomaterials [20][21], and their potential risk assessment for human health [22][23].
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Figure 35. There are different suggested factors affecting the fate of nano-agrochemicals in soils and their uptake by cultivated plants, which include soil, plants, nanoparticles (NPs), and environmental factors. SOM, soil organic matter; CEC, cation exchange capacity. Sources: from different refs., referring to the text).
Are nanopesticides really necessary for producing cleaner agro-products? The main target of using nanopesticides is to avoid the harmful impacts of conventional pesticides on the environment (mainly environmental pollution, soil degradation, and pesticide resistance), due to overdose, inefficient usage, and post-application losses [21][24][25]. Properties of pesticides in nano-formulations could improve their efficiency by enhancing solubility, permeability, and stability, as well as their protection from premature degradation and controlling their release profile. Nano-pesticides may involve nano-encapsulations (lipid-based, polymeric, silica-, and clay-based), nanomaterials as active ingredients, nano-emulsions, metal-organic framework-based nano-formulations, greener nano-formulations, and nano-suspensions [24]. Seeking sustainable agriculture, nano-formulations of pesticides have recently been developed to modulate the plant-associated microbiome [18][19]. Nanotechnology strategies can decrease the harmful effects of pesticides on the agroecosystem via their nano-specific properties, which may include large surface area, small size, and ease of modification for developing sustainable agriculture [21]. Concerning nanofertilizers, there is no increase in agro-productivity under stress and climate change without enough/suitable amounts of agrochemicals (primarily chemical fertilizers and pesticides). Nanopesticides and nanofertilizers as nano-agrochemicals are considered controlled-release nanomaterials, which mainly depend on properties of the environment besides soil, plants, and NMs such as temperature, pH change, redox conditions, light, and the presence of enzymes, as presented in Figure 35 [26]. Why are nanofertilizers a promising approach for sustainable agricultural production? Nanofertilizers are considered eco-friendly alternatives to chemical fertilizers, which have several environmental problems, especially under excessive application. Many problems for the food chain can be expected due to the intensive use of chemical fertilizers because of their drastic deteriorating effect on agroecosystem health, degradation of soil fertility, and damage to human health [27]. Nano-enabled fertilizers are agrochemicals that have the ability to control nutrient release, enhance nutrient use efficiency (NUE), economic feasibility, and environmental compatibility [28]. Many types of nano-structured materials are nutrient nanocarriers, such as nano-clays, carbon-based nanomaterials, hydroxyapatite NPs, mesoporous silica, polymeric NPs, and other nanomaterials [28][29]. However, nano-enabled biogenic fertilizers have been addressed to solve these challenges through the integration of biotechnological and nanotechnological approaches, which have revolutionized the food production and agriculture sectors [27]. The benefits of nanofertilizers were proven, especially under abiotic stress, by mitigating the adverse effects of soil salinity stress [30]. The main mechanism of this mitigation may involve decreasing the uptake of Na+ by roots and their accumulation in the shoots, the Na+/K+ ratio, and increasing the K+ uptake. NPs can improve plant salt tolerance by elevating the expression of Na+/H+ anti-port and tonoplast H+-ATPase at the root membranes and shortening the root apoplast barrier, thus limiting Na+ translocation to tissues of the shoot and reducing Na+ toxic effects [31]. The mode of action of applied nanofertilizers mainly depends on the soil, plant, and environmental factors in addition to the characteristics of nanoparticles. Nanofertilizers have a tangible effect on the mitigation of salinity stress, depending on plant species, type of nanofertilizer, applied dose, and culture conditions. It is worth noting that green nanofertilizers are useful to mitigate soil salinity because they are sustainable and nearly non-toxic to cultivated plants and soil microbiomes. This form of nanofertilizer can improve both productivity and quality of banana fruits by increasing antioxidant and osmo-regulators proline and soluble carbohydrates under saline soils and a hot, dry climate [32][33]. Furthermore, green TiO2-NPs (50 ppm) ameliorated oxidative stress, germination parameters, and vigor indices of soybeans under salt stress up to 200 mM NaCl [12][34]. Depending on the investigation media and plant growth stage, green Se-NPs (up to 50 mg L−1) improved the germination rate of mustard seeds by 31% and total chlorophyll content by 49% as a potential antimicrobial agent under salt stress at 200 mM NaCl in Petri plates for 4 days [1][35]. The next generation of nano-agrochemicals may include nanogels, nano-micelles, nanosuspensions, porous silica nano-emulsions, and nanoclays, which can promote seed germination by controlling the release of agrochemicals, bioavailability, solubility, and stability [13][36].

2.2. Nano-Soil Amendments

Why should we remediate saline soil? Soil salinization, or salinity, suffers from excessive accumulation of salts and degradation problems in soil (mainly decreased soil aeration, porosity, and water conductance due to the accumulation of Na+ in the soil). The main features of soil salinity may involve high values of soil EC (salinization), pH (alkalinization), and exchangeable sodium percent (ESP; sodification), which result from the high solubility of Na-salts and precipitation of CaCO3 under higher pH values [37]. The replacement of Na+ on the exchange sites by Ca+2 is the general amendment of soil salinity by applying chemical amendments (especially gypsum, calcium sulfate, or CaSO4·2H2O), organic amendments (biochar and chitosan), or nanomaterials (e.g., nano-gypsum, nano-sulfur, nano-biochar, and nano-chitosan). Therefore, according to soil values of pH, EC (dS m−1), sodium adsorption ratio (SAR), and ESP (%), there are four categories of salt-affected soils, including the previous parameters as follows: ±4, ±8.5, ±15, and ±13, respectively [38][39]. The main management strategies of soil salinity mitigation involve (1) removing excess salts from the soil profile by leaching and supplying enough water to prevent detrimental accumulated salts; (2) applying enough water for suitable methods of irrigation; (3) selecting the proper management of drainage and fertilization, as well as applying soil amendments like gypsum, sulfuric acid, elemental sulfur, or nanomaterials [40]. The suggested nano-managements have a crucial approach, which may depend on different mechanisms (Figure 46).
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Figure 46. (A) List of some suggested nanomaterials (NMs); (B) the main effects of salinity stress; and (C) the assumed mechanisms by which cultivated plants under soil salinity can mitigate this stress after applying nanomaterials. Abbreviations: CAT, catalase; SOD, superoxide peroxidase; APX, ascorbate peroxidase; GA, gibberellic acid; MDA, malondialdehyde; ABA, abscisic acid. Sources: from different refs., referring to the text.
Nano-gypsum is considered one of the most important soil nano-amendments that can be applied for remediation of saline, alkaline, or saline-alkaline soils. This remediation may depend on many factors, such as soil characteristics, including mainly soil pH, EC, ESP, and the cultivated plant species or variety. In the presence of cultivated plants (spinach), nano-gypsum was a more effective alternative to traditional gypsum in mitigating salinity-sodicity effects (soil EC was 25.55 dS m−1) when the applied dose was 240 kg ha−1 [41]. This effective action of nano-gypsum may differ when applied in the absence of cultivated plants, as reported under applying nano-gypsum at doses up to 45%, which improved soil health by reducing soil pH, EC, and SAR during field investigation [37]. Nanochitosan also has the ability to combat salinity stress in plants [42] as a sustainable agro-tool through its nano-formulation under abiotic stress [43]. Different nano-amendments have been proven to be effective for soil salinity mitigation, including inorganic forms such as nano-selenium, nano-silica, nano-gypsum, nano-hydroxyapatite, and organic amendments such as nano-compost, nanobiochar, and nano-chitosan [44][45]. Nano-biochar can be mixed with soil in the presence or absence of plants to amend saline soils [46]. Nano-biochar can be considered a sustainable solution for environmental remediation [47]. Nano-biochar has a potential impact on supporting cultivated plants under salinity stress through many suggested mechanisms. These mechanisms involve maintaining ROS homeostasis, improving the ability of K+ retention and shoot Na+ exclusion, promoting the production of nitric oxide, increasing the activity of alfa-amylase, decreasing lipoxygenase activity, and shortening the Na+ root apoplastic to shoots [48][49].

2.3. Biogenic Nanomaterials

What is the difference between biofertilizers and nanofertilizers? In brief, bio-fertilizers are certain microbial species (e.g., Azospirillum, Rhizobium, Cyanobacteria, Azolla, and solubilizer microbes) that can promote the potential of nutrients during the soil biogeochemical cycles, whereas nanofertilizers are fertilizers containing nanonutrients for increasing crop productivity [50]. This difference is critical in the case of biofertilizers and biological nano-fertilizers, where the last one means how to produce nanofertilizers by using biological methods with microorganisms or plants. Several reports confirmed the sustainable potential of biological nanofertilizers compared with physical or chemical ones [27][29][51]. Several factors control the effectively applied nanofertilizers, which mainly involve the production methods of nanofertilizers (physical, chemical, and biological ones), the applied dose, the physio-chemical properties of NPs, the application method (soil, foliar, hydroponics, etc.), the cultivated plant species, the experimental conditions, and the salinity stress level. Many studies have reported on plant growth regulators (PGRs) [52][53] and nanomaterials [54][55] for improving the productivity of crops under salinity stress. Under soil salinity stress, many studies reported the suggested mechanisms of PGRs by alleviating salinity stress in plants through enhancing accumulation of osmolytes in plant tissues (e.g., choline, glutamate, proline, glycine betaine, soluble sugars, and polyols), increasing antioxidant activities (e.g., ascorbate peroxidase, catalase, glutathione reductase, superoxide dismutase, monodehydroascorbate reductase, and peroxidase), and non-enzymatic antioxidants such as ascorbate, carotenoids, glutathione, polyphenols, and tocopherols [56][57]. Are biogenic nanomaterials important for sustainable agriculture? Why are these kinds of nanomaterials promising, especially under stressful conditions? It is well stated that bio-nanomaterials are an eco-friendly and economical alternative to soluble traditional agrochemicals due to their many benefits. These benefits may involve the low toxicity rate in the agroecosystem and the slow release of nutrients over the growing stage of the plant, which guarantee the continuous supply of nutrients (from bio-nanofertilizers) for higher crop quality and productivity while reducing many environmental risks [27]. These biological nano-agrochemicals will also not only promote crop production but will also contribute to food security, crop nutritional health, and environmental quality. The biological methods of nanomaterials include green and microbial methods (Figure 57).
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Figure 57. (A) Main biosynthesis methods of nanoparticles (NPs) or nanomaterials (NMs); (B) a list of the common biological NPs; (C) main microbes for improving soil fertility and pant nutrition under soil salinity; and (D) NMs on soil biological activities. Sources: from different refs., referring to the text.
There is an urgent need for innovative approaches for applying nanobiotechnology in the development of nano-biofertilizers or biological nanofertilizers. These fertilizers can be produced by containing both nanonutrients and plant growth-promoting microbes (PGPM) (e.g., Bacillus subtilis and Pseudomonas fuorescens) by nanoencapsulation [58]. Nano-biofertilizers can also be produced through the encapsulation of beneficial microbes within some nanometals like gold and silver, which strongly promote the productivity of different agricultural crops [27]. Several recent studies have reported on biogenic nanomaterials, in particular biological nano-fertilizers, such as PGPM-derived nano-fertilizers and their benefits and risks to soil health [58], biologically derived smart nano-structures for more efficient biosensors [59], biostimulants, and biogenic nanoparticles, which can be produced from agro-industrial waste and plant extracts [60]. More and more reports were published on the biological role of bio-nanofertilizers for more sustainable agriculture [61], for agri-business and environmental management [27], and as bio-emerging strategies for sustainability [62].

2.4. Nanocomposites

What are nanocomposites? Why are these composites vital as agrochemicals for crop production and environmental production? Nanocomposites are special materials formed from different materials to enhance their final properties, including mechanical, thermal, optical, biodegradability, and barrier properties. Nanocomposites are promising promoters for sustainable and eco-friendly cultivation, reducing the burden of mineral fertilizers and pesticides [63]. Nanocomposites have several benefits in the agriculture, food, and medicinal sectors. In agriculture, several nanocomposites have been developed for nutrient management [64], soil and water remediation [65], food packaging [66], environmental protection [67], and supporting plants under salinity stress [68]. The mode of action of nanocomposites mainly depends on the kinds of nanocomposites, their active components, their applied dose, and the environmental conditions. Several studies were reported on different types of nanocomposites, such as curcumin-polyvinyl alcohol nanocomposites [69], biochar nanocomposites [70][71], casein-coated iron oxide NPs [64], and chitosan nanocomposites [72][73]. Treatments with nanocomposites of chitosan or biochar are common under salinity stress and are applied at low doses, which are able to mitigate osmotic stress under the cultivation of different crops, such as dill [71], safflower [70], grape [74], and wheat [72][73]. Nano-chitosan can support previous crops due to being non-toxic, having greater adsorption ability, having a higher surface area, and having a higher ability to encapsulate with other active molecules with high encapsulation efficiency compared to the control [75]. These results were confirmed under pot conditions and under different controlled saline soils. There are many advantages to biological nanocomposites, such as biodegradability as eco-friendly biopolymers, improved characteristics, and a lower carbon footprint due to lower emissions of greenhouse gases [76]. Biopolymer-based nanocomposites are effective candidates for controlling and slowing the release of different agrochemical formulations due to their features. They may involve high-effective carriers of core ingredients precisely to the plants, lowering environmental pollution risks, and apply agrochemical amounts due to less frequent applications. They are also safe to use, reduce environmental impacts, enhance water retention properties, and are designed to target specific sites of weeds or pests [76].

2.5. In Vitro Nano-Management

The study of applied nanomaterials under saline conditions can be performed even under in vitro conditions. Nano-plant tissue culture means the study of certain plant species grown on sterile nutrient medium supplemented with nanoparticles under fully controlled conditions. This kind of study is crucial nano-management for many in vitro plant biology studies, such as embryogenesis, cytology, pathology, morphogenesis, and clonal propagation [6]. The successful growth and development of in vitro plants depends on factors related to the type of explants, the genotype, the culture medium, methods of surface disinfection, the intensity of light, temperature regimes, and growth regulators. There is a positive impact of applied nanoparticles on plant tissue culture; for example, they can improve the germination of seeds, enhance plant growth, stimulate the production of bioactive compounds, and protect plants under salinity stress. At different salinity levels, many kinds of nanoparticles were used in vitro for improving plant growth under such stress, including metal NPs or nanocomposite. Plant tissue culture is considered an economically applicable technique for producing grape softwood cuttings [77] or strawberry explants/transplants [78] or mitigating salt stress on plants such as coriander [79], banana [80], and tomato [55]. The applied nanomaterials included a variety of nanoforms, such as metal/metalloid NPs or nanocomposites. Different types of nanocomposites were investigated in vitro under salinity stress, such as proline-doped ZnO nanocomposites [79] and ZnO-glycine betaine nanocomposites [81].

3. Nano-Management under Toxicity Conditions

Despite the previous potential benefits of nanomaterials, many reports pointed out the expected harmful effects of intensive applications of such NMs in agroecosystem compartments as nanotoxicity [82][83][84]. These compartments may involve the nanotoxicity of the soil rhizosphere, aquatic life, cultivated plants, soil organisms, farm animals, groundwater, drinking water, the food chain, and humans. However, there are still significant gaps in research and a lack of rigorous monitoring of this nanotoxicity [59]. This toxicity has many levels that are needed to be investigated, such as phytotoxicity, cytotoxicity, and genotoxicity (Figure 68). Higher doses of NMs may cause cytotoxicity and genotoxicity for living organisms (plants and microbes) through damage to DNA structure, a reduction in the viability of cells, an alteration in genes, aberrations in chromosomes, and a reduction in the mitotic index [85]. The phytotoxicity study of engineered NPs is an emerging concern to elucidate their potential effects on plant systems [86]. This phytotoxicity is known to be totally controlled by the chemical nature of the element (NP), surface charge, size, coating molecules, and environmental factors like pH and light [83]. The toxic level of applied nanomaterials or nanoparticles on cultivated plants was reported. This toxic level mainly depends on the plant species, applied dose and type of NPs, size of applied NPs, cultivation method or growing medium, method of application, etc. It was found that applying nano-zero-valent iron (nZVI) caused toxicity to mung bean under hydroponically cultured seedlings at 600 mg L−1 [87], whereas applying more than 200 mg L−1 nZVI to Herbaceous cattail exhibited strong toxic effects [88]. Depending on the type of NPs and plant species, it was noticed that the toxic level of Fe-based NPs may range from 50 to 2000 mg L−1 [89].
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Figure 68. The possible mechanisms of nanotoxicity on cultivated plants and soil microbes are phytotoxicity and microbial nanotoxicity. Abbreviations: ROS, reactive oxygen species; PSI, PSII, Photosystem I and II. Sources: from different refs., referring to the text.
Concerning the nanotoxicity on soil microbiomes, NMs have direct impacts due to their high applied dose, which reduces nutrient bioavailability. The mechanism of this action may be microbial cell membrane absorption, leading to direct association with amino, carboxyl, and thiol functional groups of proteins and nucleic acids. Regarding the indirect impacts of nanotoxicity, they can be attributed to the interaction with organic toxicants after they reach cumulative effects [90]. The possible mechanisms for direct nanotoxicity may include the disruption of membranes, genotoxicity, forming ROS, and release of toxic constituents, as well as structural changes in the microbial membrane, disruption of the functionality of cells, and eventually the death of cells [90]. Phytotoxicity is also an expected problem after applying intensive amounts of manufactured NMs [91]. Many reports confirmed the problem of phytotoxicity in agroecosystems [82][89]. These studies have reported that excess metal-based NPs cause oxidative stress on cultivated plants through the generation of ROS, reducing plant growth, causing hormonal imbalance, and causing damage to the secondary metabolism, along with potentially genotoxic consequences [82]. The main problem with nanotoxicity effects on environmental components is the lack of methodology to monitor and follow accurately the NPs fate in soil and different biological systems, besides the insufficient knowledge regarding reliable results [89]. Under soil salinity stress, the current situation is very complicated due to the interactions among many factors, including the toxicity of soil salinity, phytotoxicity, soil microbial toxicity, and nanotoxicity. What is the contribution of each component in this toxicity state? What is the real situation of salinity toxicity on both cultivated plants and soil microbes in the presence of toxic and non-toxic NMs (in cases of higher and optimum doses)? Are higher applied NM doses antagonistic or synergistic to the toxicity of soil salinity? Which regulatory ecotoxicity tests and protocols should be used in research? On the other hand, several studies have been published on the role of applied NMs or NPs for enhancing cultivated plants under soil salinity conditions, but very few or no studies, as far as we know, have focused on the interaction between the toxicity of soil salinity and the toxicity of applied NMs and their impacts on soil microbes and cultivated plants. Depending on the applied dose of NPs, they can enhance the salinity toxicity tolerance in some plant species by modulating the photosynthetic efficiency, antioxidative enzymes, and cellular damage [31][92].

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