ArticlePDF Available

Drought Stress Under a Nano-Farming Approach: A Review

Authors:
  • Kafrelsheikh University, Faculty of Agriculture, Egypt

Abstract

NGOING climate change is leading to more extreme weather, which affects agriculture in various ways. In semi-arid regions of the world, and even some humid areas, drought stress is becoming more frequent. Prolonged drought periods lead to severe damages to cultivated plants, which impacts water and food resources. This review investigates how drought stress impacts plants and how management practices can be utilized to reduce the negative effects. Special attention is given to nano-farming where application of nanomaterials may ameliorate drought stress by increasing enzymatic antioxidants and decreasing generation of reactive oxygen species (ROS). Despite the promising results of nano-farming we conclude that further research is required, particularly to investigate potential negative effects, for example on nano-toxicity where particles can enter groundwater or into the food chain. Finally, drought stress is a complexed problem that affects all living organisms. A quick fix is not possible, but humankind needs to collaborate and work for a better future for all.
_________________________________________________________________________________________________
*Corresponding author e-mail: ramady2000@gmail.com
Received: 29/09/2023; Accepted: 18/10/2023
DOI: 10.21608/EJSS.2023.239634.1668
©2022 National Information and Documentation Center (NIDOC)
Egypt. J. Soil Sci. Vol. 64, No. 1, pp: 135- 151 (2024)
Drought Stress Under a Nano-Farming Approach: A Review
Daniella Sári1, Aya Ferroudj1, Dávid Semsey1, Hassan El-Ramady1,2, Salah E.-D. Faizy2,
Shaban M. Ibrahim2, Hani Mansour3, Eric C. Brevik 4, Svein Ø. Solberg5 and József
Prokisch 1
1 Nanofood Laboratory, Department of Animal Husbandry, Institute of Animal Science, Biotechnology and
Nature Conservation, Faculty of Agricultural and Food Sciences and Environmental Management, University of
Debrecen, 138 Böszörményi Street, 4032 Debrecen, Hungary
2 Soil and Water Dept., Faculty of Agriculture, Kafrelsheikh University, 33516 Kafr El-Sheikh, Egypt.
3 Water Relations and Field Irrigation Dept., Agriculture and Biological Institute, National Research Centre, 33
El-Behouth St., 12622, Giza, Egypt
4 College of Agricultural, Life and Physical Sciences, Southern Illinois University, Carbondale, IL 62901, USA
5 Faculty of Applied Ecology, Agriculture and Biotechnology, Inland Norway University of Applied Sciences,
2401 Elverum, Norway
NGOING climate change is leading to more extreme weather, which affects agriculture in
various ways. In semi-arid regions of the world, and even some humid areas, drought stress is
becoming more frequent. Prolonged drought periods lead to severe damages to cultivated plants,
which impacts water and food resources. This review investigates how drought stress impacts plants
and how management practices can be utilized to reduce the negative effects. Special attention is
given to nano-farming where application of nanomaterials may ameliorate drought stress by
increasing enzymatic antioxidants and decreasing generation of reactive oxygen species (ROS).
Despite the promising results of nano-farming we conclude that further research is required,
particularly to investigate potential negative effects, for example on nano-toxicity where particles can
enter groundwater or into the food chain. Finally, drought stress is a complexed problem that affects
all living organisms. A quick fix is not possible, but humankind needs to collaborate and work for a
better future for all.
Keywords: Global warming, Food crisis, Nano technology, Poverty, Water crisis, Water deficit.
1. Introduction
Drought can be defined as drier than normal
conditions due to a deficiency of precipitation over an
extended period of time, a season or more, leading to
a water shortage” as reported by the National Oceanic
and Atmospheric Administration (NOAA 2023).
Drought can come as a result of shifts in weather
systems. This can be in the monsoon, in other weather
patterns caused by global warming, or by random or
seasonal variations and rainfall anomalies (Seleiman
et al. 2021). Drought can be classified into
meteorological, hydrological, agricultural, ecological,
or socioeconomical drought depending on the cause
of the water deficits (Kresic 2009).
Drought stresses plants including their production
systems. This creates great pressure on global
resources, which are already stressed by a steadily
increasing population, ongoing climate change
(Ahluwalia et al. 2021), soil salinity, and air, water,
and soil pollution (Zandalinas and Mittler 2022).
O
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Drought is an abiotic stress which severely aggravates
other stresses like pathogen attack, salinity, and heat,
which cause damage to cultivated plants and reduces
agricultural productivity (Fadiji et al. 2022). Drought
also is one of the most common, intense, and frequent
extreme weather events besides heatwaves and floods,
with events that differ from region to region and from
one year to another (Rajanna et al. 2023). Severe
drought events have increased globally in recent
years. Due to changes in rainfall patterns, the
frequency of droughts has led to water scarcity,
especially in arid and semi-arid regions of the world.
Several recent publications have shed light on drought
stress. It is important to investigate drought from
different points of view to understand the mechanisms
of stress and what can be done to minimize negative
effects. This includes research into projections of
future drought trends (Vicente-Serrano et al. 2023),
drought stress on crops (Fadiji et al. 2022) and forests
(Konings et al. 2021), plant propagation under
drought stress (Zhang et al. 2022), application of bio-
irrigation to mitigate drought (Rajanna et al. 2023),
how drought impacts water quality (Qiu et al. 2023),
microbial resistance to drought (Allison 2023), and
plant-soil feedback mechanisms under drought (de
Vries et al. 2023).
Nano-farming is the application of nanomaterials to
crop production, including seed germination by nano-
priming, fertilization with nanofertilizers, protecting
plants from pathogens with nanopesticides, and
enhancing crop quality with nanomaterials (El-
Ramady et al. 2023). Several studies have
investigated applications and issues in nano-farming,
such as vegetable production (Abdalla et al. 2022),
nanotoxicity issues (Behl et al. 2022), nano-farming
to improve crop production (El-Ramady et al. 2023;
Haris et al. 2023), and nitrogen cycling under
nanomanagement (Wang et al. 2023).
This review focuses on the impact of drought stress
on plants and production systems. The main aims are
to: 1) better understand the mechanisms behind
drought stress in plants; 2) provide a set of
management practices that reduce the negative effects
of drought on plant production; 3) explore drought at
a system level, including how it affects water and
food resources; and finally, 4) examine if nano-
farming could reduce the impact of drought. Drought
stress affects not only plants but also animals,
microorganisms, and the total environment. A broad
perspective will therefore be applied in this review.
2. Impacts on plants and farming systems
Drought leads to morphological and physiological
changes in plants, which includes reduced
photosynthesis, reduced transpiration, reduced root
and shoot growth, osmotic adjustments, increased
reactive oxygen species (ROS) production, and
enhanced plant senescence (Nadeem et al. 2019; Ilyas
et al. 2021; Fadiji et al. 2022; Ahluwalia et al. 2021).
Drought stress damage is increased when
accompanied by other stresses, like salinity stress
(Angon et al. 2023) or heat stress (Yang et al. 2022a;
Sharma et al. 2023). Many studies have highlighted
how combined drought and salinity stress increase
negative effects on plants through impacts on
photosynthesis, growth, ionic balance, and oxidative
balance (Angon et al. 2022; Kumar et al. 2023).
Many strategies can be applied to mitigate drought
stress. These include seed priming (Ishtiaq et al.
2023), the ability of metal-based nanoparticles to
mitigate drought stress (Rasheed et al. 2022), use of
drought resistant plant varieties (Yu et al. 2022), use
of mulch or film farming (Han et al. 2023),
application of beneficial microbes (Chieb and
Gachomo 2023), super-absorbent hydrogels (Saha et
al. 2020), fertilizers like potassium (Fang et al. 2023),
selenium (Ishtiaq et al. 2023), and silicon (Anitha et
al. 2023), as well as biochar (Alotaibi et al. 2023).
The mechanisms resulting from these strategies may
directly and/or indirectly benefit or induce systemic
tolerance. System tolerance can be achieved by
improving certain biological processes in the plant,
such as stimulating the antioxidant system, enhancing
the root and shoot systems, increasing photosynthesis
rates, and improving the production of carotenoids.
The effects can also be due to phosphate
solubilization, ACC-deaminase and phytohormones
production, nitrogen fixation, and siderophore and
exopolysaccharides production (Ahluwalia et al.
2021).
Drought affects cultivated plants by reducing
photosynthesis, growth, and biomass production,
while at the same time increasing protein degradation
and oxidative chloroplast damage in plants (Ahmad et
al. 2022; Kumar et al. 2023). Qiu et al. (2023)
reported that agricultural and hydrological droughts
can increase water pollution issues and agricultural
drought is the type of drought most impacted by
climate change. A summary of drought causes, types,
and effects on plants is given in Figure 1.
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Fig. 1. Drought causes, types, and its effects on cultivated plants.
There are several farming systems, including arable
or crop farming, agro-livestock farming, bio-
farming, cropping-agroforestry farming, microalgae
or seaweed farming, integrated mixed farming,
integrated livestock forestry, climate-smart
agriculture, smart or precision farming, and
enhanced smart farming (Figure 2) (El-Ramady et
al. 2023). Each of these can face drought threats,
causing significant decreases in productivity, but the
susceptibility differs from one system to another.
Drought-related losses in crop productivity might be
lower under organic compared to conventional
farming due to higher soil organic carbon content
and more abundant plant symbionts in organic
cropping systems, which potentially contribute to
improved soil water retention and aggregation
(Banerjee et al. 2019; Büchi et al. 2022; Schärer et
al. 2022; Hura et al. 2023; Liu et al. 2023; Wittwer et
al. 2023). Drought related grain yield reduction
when comparing organic farming and conservation
tillage practices was 34, 23 and 17% lower in the
organic system for maize, pea-barley, and winter
wheat, respectively (Wittwer et al. 2023).
Several studies have been published on the impacts
of drought stress under different farming systems in
many regions, such as rainfed farming in
Afghanistan (Aliyar et al. 2022), agroforestry and
goat system in India (Palsaniya et al. 2023), wet crop
farming in Indonesia (Irawan et al. 2023), rice
farming in Vietnam (van Aalst et al. 2023), semi-arid
farming in Zimbabwe (Mupepi and Matsa 2023),
organic farming and conventional farming in
Switzerland (Wittwer et al. 2023; Gavín-Centol et al.
2023), cowpea farming in Portugal (Moreira et al.
2023), agricultural drought in northeast Italy (Sofia
et al. 2023) and southern China (Pan et al. 2023), and
meteorological droughts in China (Zhang et al.
2023). Drought stress has been found to reduce
invertebrate feeding activity in soils under
conventional agriculture, which is associated with
mesofauna and their vertical migration, and which
decreased with soil depth (Gavín-Centol et al. 2023).
3. Agricultural management practices
It is necessary to manage during a drought to
minimize damage to cultivated plants, farm animals,
and the entire agroecosystem. According to previous
studies there are three levels of agro-practices that
can be applied, which can be termed individual,
combined, and multiple agro-practices (Table 1).
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Management options to address drought range from
plant breeding and selection to molecular or genomic
perspectives, grafting, pruning, flower/fruits
thinning, bio-irrigation, mulching, and net shading
(Figure 3), and they can be applied at different
stages of crop development from seeding to
maturation (Liu et al. 2023). Agro-practices and
drought stress combine to cause direct and/or
indirect impacts on cultivated plants, e.g., by
reducing the formation of reactive oxygen species
(ROS) and boosting stress antioxidant enzymes and
protein expression for mitigation of drought stress
(Malko et al. 2022). Depending on plant growth
stages, many agro-chemicals can be applied as
treatments to reduce the negative effects of drought
(Devin et al. 2023). Applied silicate solubilizing
bacteria and potassium silicate supported the growth
of sugarcane under drought conditions (Anitha et al.
2023), and grafting can enhance drought resistance
in fruit and vegetable crops (Yang et al. 2022b).
Fig. 2. Some common farming systems.
There is great concern that drought is and will
continue to increase in severity, duration, and
frequency given the ongoing changes in climate and
documented increases in extreme climatic events
(Wilhite 2019). Integrated drought management
(IDM) should be moved from reactive to proactive
forms. Here, the 3-pillars of integrated drought
management good serve as a guideline. They are: (1)
monitoring and early warning systems; (2)
vulnerability and impact assessment; and (3)
mitigation, preparedness, and response actions
(Wilhite 2019). Many recent reports on IDM focus
on related-topics such as ecological drought (Sadiqi
et al. 2022) and assessing drought vulnerability for
water resources management, e.g., in Central India
(Thomas et al. 2022), Bangladesh (Islam et al. 2023),
and Iran (Jalili et al. 2023). Some studies have
focused on multiple uncertainties (Wang et al.
2023a), hydro-systems and cities (de Assis Souza
Filho et al. 2023), or food (Alves et al. 2023), This
IDM approach can involve application of materials
for mitigation of drought such as addition of
nutrients including silicon (Si), potassium nitrate
(KNO3-) (Alam et al. 2023), methyl jasmonate and
potassium (Beigi et al. (2023), or biochar and methyl
jasmonate (Nasiri et al. 2023).
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Table 1: Management of crop production under drought using different agro-practices.
Agro-practices
Main effects
Reference
I. Individual agro-practices
Grafting
Grafting supports morphological, physiological and
molecular changes in roots, stems, and leaves and activates
osmoregulation, reduces transpiration, enhances
antioxidants, and regulates phytohormones
Yang et al.
(2022b)
Canopy
architecture
Dwarf cultivars are needed for smaller leaf size to reduce
transpiration and improve energy savings
Devin et al.
(2023)
Canopy
architecture
Canopy structural changes-controlled canopy-level solar
induced chlorophyll fluorescence reduction during drought
Hwang et al.
(2023)
Net shading and
mulching
Ecological mat mulching improved yield of C. oleifera by
maintaining soil water potential and temperature
Ye et al. (2021)
Deficit irrigation
for water savings
The proper deficit irrigation may improve water
conservation by promoting transpiration rate, root activity,
and biomass yield
Peng et al.
(2022)
Rainwater
harvesting tools
Identifying suitable sites for rainwater harvesting using
check dams, earthen dams, percolation tanks, farm ponds,
and gulley plug sites to mitigate drought effects
Bera and
Mukhopadhyay
(2023)
Seed priming
Seed priming with α-naphthaleneacetic acid regulated
germination and seedling by increasing triacylglycerol
mobilization, antioxidant capacity, and sucrose transport
under drought conditions
Xing et al.
(2023)
Fertilizers (e.g.,
K, Se, Si, etc.)
Potassium fertilizers improved drought stress alleviation by
increasing salicylic acid, regulation of phytohormones
(ABA acid JA) and photosynthesis
Fang et al.
(2023)
Fertilization
Se promoted photosynthetic efficiency, alleviated drought-
induced oxidative stress, and increased the endogenous
salicylic acid levels
Fan et al.
(2022)
Fertilization
Exogenous Si alleviated drought by improving
photosynthetic enzymes, the stomatal size and stomatal
aperture, inhibited superoxide free radicals and increased
antioxidant enzymes activities
Xu et al.
(2022)
II. Combined agro-practices
Melatonin + 24 -
epibrassinolide
Applying both improved photosynthesis, proline
accumulation, and antioxidant enzymes under combined
drought and salt stress
Yusuf et al.
(2024)
Microbes and
selenium
Rhizophagus intraradices inoculant and Se-priming
improved morphological, bio-physiological properties, and
production of plants under water stress
Nazim et al.
(2023)
Abscisic acid
and Selenium
Foliar spraying of abscisic acid and Se enhanced the
vegetative growth of plants under water deficit conditions
by protecting then from oxidative stress
Ramasamy et
al. (2022)
Salicylic acid
(SA) and silicon
Foliar application of Si and SA increased phenyl-alanine
ammonialyase activity, polyphenol and proline contents
under water stress
Shohani et al.
(2023)
Si + arbuscular
mycorrhiza
fungi (AMF)
Combined use of Si fertilization with AMF application can
mitigate salinity and drought stress as AMF hyphae/spores
accumulate Si in rice roots
Etesami et al.
(2022)
K2SiO3 + silicate
solubilizing
bacteria
Improved uptake of Si and NPK along with enhanced plant
growth and quality parameters compared to the control
under drought conditions
Anitha et al.
(2023)
Brassinosteroids
and timber waste
biochar
Combined application enhanced drought tolerance by
increasing photosynthetic pigments, antioxidants, Ca, P,
and K content in plants under drought stress
Lalarukh et al.
(2022)
III. Multiple agro-practices
Multiple agro-
chemicals
Applying a combination of agro-chemicals and methods of
treatment as an effective treatment approach for drought
stress depend on growth stages
Malko et al.
(2022)
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Fig. 3. Different levels of agro-practices for drought management.
Abbreviations: Effective Microorganisms (EM)
4. Drought stress and water resources
Climate change has many key indicators, including
a higher average global temperature, alterations in
rainfall patterns, rising sea levels, ice loss at Earth’s
poles, and more frequent and severe droughts,
hurricanes, floods, wildfires, and heatwaves
(Figure 4). As a part of the carbon, nitrogen, and
water cycles, changes that influence our climate
also influence soils and vice versa (Brevik, 2012).
There are complex interactions between cultivated
plants and water that have been studied under
drought conditions (Arab et al. 2023; Guarnizo et
al. 2023). Plant water relations that might be
disrupted by droughts due to water deficit include
root hydraulic conductance, root sap flow rate, leaf
water potential, turgor pressure, and water use
efficiency. These plant water disturbances may
reduce hydraulic conductance in both stomata and
roots, lowering water potential of the environment
due to stomatal closure during water deficit
(Guarnizo et al. 2023). Thus, a global water
shortage would become a serious eco-problem
facing all humankind. This is especially true under
the ongoing global climate changes, which have
increased concerns about drought as a key factor
restricting the development of agricultural
production worldwide (Yang et al. 2021).
Several mechanisms are initiated in plants when
they are exposed to drought (Khan et al. 2018;
Yang et al. 2021; Angon et al. 2023; Riyazuddin et
al. 2023; Wang et al. 2023b). The main
mechanisms include changes in the internal
structure and external morphology of leaves, roots,
and stems, and activation of drought-induced
proteins, osmotic regulation, and the reactive
oxygen scavenging system (Figure 4).
Morphological mechanisms include reducing leaf
stomatal density and/or conductivity, increasing the
epidermal wax layers, increasing thickness of the
leaf cuticle, and lowering levels of lignin in the
leaves. Physiological mechanisms include reducing
photosynthetic rate and Ribulose-1,5-bisphosphate
(RuBP) content, increasing osmotic regulation
through K+, Na+, H+, and organic substances
(glycine betaine and polyamines, proline, and
trehalose, mannitol, fructan, and others), increasing
drought-induced proteins (e.g., dehydrin and
aquaporin), preventing degradation of chlorophyll
in leaves, and decreasing electron transfer rate or
photoinhibition (Yang et al. 2021).
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Drought has serious impacts on water resources
which has led to numerous studies focused on
integrated approaches for water resource
management under drought (Alhama et al. 2020;
Alam et al. 2023; Wang et al. 2023b). This
approach to manage water resources under drought
has been employed in many regions such as
Southern Algeria (Zegait et al. 2023), Saudi Arabia
(Abd El-Hamid and Alshehri 2023), Eastern India
(Biswas et al. 2023), Italy (Rossi and Peres 2023),
North America (Asif et al. 2023), Sweden
(Teutschbein et al. 2023), and Iran (Khani et al.
2023).
Fig. 4. Climate change can induce drought, which may be accompanied with salinity or heat stress. There
are a variety of impacts of drought, and many plant adaptations to drought are common
5. Drought stress and food resources
Food resources can be defined as “natural or
artificially produced materials which are used as
food to derive metabolic energy”. These include
plant and animal sources.
Global problems linked to food resources under
drought include poverty, undernourishment, famine,
malnutrition, hunger, acute food insecurity, food-
deficit, and global food scarcity (Figure 5). Global
food security is strongly linked to the relationship
between the impacts of drought impacts and
agricultural production (Krishnamurthy R et al.
2022). With increasing food demand due to
population growth, food production needs to roughly
double by the 2050s (Leng and Hall 2019). Drought
is an extreme weather phenomenon that is one of the
main climatic constraints to crop productivity.
Drought forces crops to close their stomata to limit
evaporative water loss, thus reducing carbon uptake
for photosynthesis and decreasing yields. It is
estimated that a loss of 1820 million Mg of cereal
crops (rice, maize, and wheat) has occurred globally
during the past four decades due to droughts (Leng
and Hall 2019). The impact of drought stress on crop
productivity (food) and food security can be found in
the literature (Fadiji et al. 2022; Roy et al. 2022;
Yang et al. 2023). Integrated management of drought
risks has been discussed by Alves et al. (2023) while
agricultural drought has been investigated by studies
in several countries and regions, e.g., China (Pan et
al. 2023), Southeast Asia (Ha et al. 2023), India
(Bhukya et al. 2023), and Iran (Kheyruri et al. 2023).
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Fig. 5. Common impacts of droughts on food resources under climate change.
As previously mentioned, drought causes serious
food security concerns. Investigation of these
concerns have included drought resilience in a multi-
level food supply chain in the UK (Vicario et al.
2023), agricultural vulnerability to drought in
China’s agro-pastoral ecology (Li et al. 2023),
breeding plants to be tolerant to drought stress with a
focus on rhizosphere properties (Cheraghi et al.
2023), and evaluation of the impact of complex
drought patterns on global yield loss for major crops
(Santini et al. 2022). Loss of crop productivity due to
drought stress has been investigated using many
approaches such as APSIM crop models in northeast
China (Wang et al. 2022), analyzing spatiotemporal
crop yield loss in Nepal (Dahal et al. 2023), crop
simulation, risk curves, and risk maps in Huaibei
Plain, China (Wei et al. 2022), using crop growth
stages in the Huaibei Plain, China (Wei et al. 2023),
and analysis of economic losses of crop production
in Pakistan (Rahman et al. 2023).
6. Nano-farming approach under drought
Nanotechnology has penetrated nearly all fields of
agriculture, including cropping, animal, and fish
systems. Several nanomaterials have been utilized to
mitigate stressful conditions, including drought
stress. Such material includes nanofertilizers, nano-
encapsulated plant growth regulators, nano-based
biostimulants, nanopesticides, and nanosensors
(Figure 6). These nanomaterials (NMs) are often
viewed as being eco-friendly and low-cost remedies.
They have high surface to volume ratios and possess
unique physicochemical properties that regulate plant
protective responses through synergistic actions,
which can include regulating phytohormone
signaling and modulating the gene expression of
phytohormones involved in plant growth under stress
(El-Ramady et al. 2023). The application of NMs in
agriculture has two important dimensions. The first is
the positive side of the applied NMs, which may lead
to improved performance in crop, animal, and fish
units. The second is the negative side, which may
lead to unwanted effects that result in pollution and
nano-toxicity.
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Fig. 6. Nano-management practices to address drought stress and suggested nanomaterials for mitigation
of that stress.
Fig. 7. Positive and negative aspects of the use of nanomaterials in agriculture (adapted from El-Ramady et al. 2023).
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Table 2. Table 2. Overview of studies where nanomaterials have been applied for the mitigation of
drought stress in various crops and with suggested mechanisms involved.
Nanomaterial
Suggested mechanism under drought stress
Reference
Iron nano-oxide
Using seed priming at 300 ppm + foliar spraying 15
ppm of nano increased antioxidant activities (CAT,
SOD), and water productivity under drought stress
Farajollahi et
al. (2023)
ZnO-NPs
Applied nano at 10 ppm, as soil and foliar improved
the growth of cuttings, antioxidant enzymes, and
biomass
Haydar et al.
(2023)
CuZn-magnetic
NPs
Nano-antifungal agents inhibited ergosterol
biosynthesis and managed Fusarium wilt
Bouqellah
(2023)
ZnO-NPs
ZnO NPs (250 ppm) enhanced drought tolerance by
improving RWC, MSI, Zn-content, chlorophyll,
protein/osmolyte contents and antioxidant enzymes
Pandya et al.
(2023)
Zinc-chitosan-
salicylic acid
(ZCS) NPs
ZCS-NPs (100 ppm) mitigated drought stress by
improving osmotic status, enhancing osmo-
protectants synthesis, activating anti-ROS-enzymes
Das et al.
(2023)
Nano Chitosan-
glycine betaine
Nano-seed priming (100 mM) for 18 h improved
growth under combined drought and heat stresses by
adjusting osmotic status, conserving tissue water, and
activating the antioxidant defense systems
Al Masruri et
al. (2023)
Carbon
nanoparticles
Seeds were enhanced by priming 80 μg/ml (nano)
with compost and AMF under drought, increasing
enzyme activities of ascorbate peroxidase, dehydro-
ASC reductase, and mono-dehydro-ASC reductase
Alsherif et al.
(2023)
Biological nano-
silica
Nano 60 ppm was the effective dose for improving
plant tolerance to drought by lowering H2O2 and lipid
peroxidation and increasing relative water content and
enzyme antioxidants (APOx, CAT, and SOD)
Boora et al.
(2023)
Abscisic acid-
loaded ZnO-NPs
Nano improved growth under drought by reducing
lipid peroxidation and increasing antioxidant activities
(catalase, ascorbate peroxidase, and peroxidase)
Fatima et al.
(2023)
Glycine betaine-
ZnO nano-
composite
Applied NPs (at 100 ppm) mitigated oxidative
damage by up-regulating antioxidants, decreasing the
production of ROS, and reducing potential in plantlets
Hanif et al.
(2023)
Molybdenum
trioxide NPs
Applying 50 ppm MoO3-NPs increased leaf area,
nodule number, and the yield of a drought-stressed
pea by activating CAT, APOx, SOD, and GPx
enzymes
Sutulienė et al.
(2023)
Carbon
nanoparticles
Applying nano (6 ppm) alleviated drought stress by
regulating chlorophyll content, water status, osmo-
protectants, and enzymatic antioxidants in seedlings
Alluqmani and
Alabdallah
(2023)
Abbreviations: Relative water content (RWC), Membrane stability index (MSI), catalase (CAT), superoxide
dismutase (SOD), glutathione peroxidase (GPx), and activity of ascorbate peroxidase (APOx)
Nano-fertilizers have great potential for alleviating
drought stress. Positive effects after application of
NMs have been found in numerous studies. These
include CaO-NPs (75 ppm) in canola (Mazhar et al.
2022), biological Fe3O2-NPs (0.6 1.2 mM) in
wheat (Noor et al. 2022), biological nano-silica (60
ppm) in wheat and other crops (Boora et al. 2023),
iron nano-oxide (priming 300 ppm + spraying
15 ppm) in soybean (Farajollahi et al. 2023), nano-
priming of ZnO-NPs (250 ppm) in wheat (Pandya
et al. 2023), and foliar applied zinc-chitosan-
salicylic-NPs in wheat (Das et al. 2023).
Nanopesticides have successfully been applied to
drought-stressed crops for the control plant
pathogens. One example is the application of nano
Se and Si to boost the productivity of common bean
under Alternaria leaf spot disease stress (Taha et al.
2023). Nanomaterials have also been used to detect
plant pathogens through tools like nano-biosensors,
nano-coding, nano-diagnostic kits, and nano-pore
sequencing (Shivashakarappa et al. 2022).
The main mechanisms of stress relief are due to
controlling the release of active ingredients in
nanofertilizers or nanopesticides. This may create
pH changes, alter enzyme activities, or change light,
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temperature, or redox potential in the agro-
environment (Shen et al. 2023). It is important to
protect the active ingredients in nanopesticides and
nanofertilizers by applying nanocarriers. There is a
need for further research on optimizing the
performance of the applied NMs. Key issues in
addition to efficiency will be lowering their costs
and avoiding nanotoxicity problems (Figure 7).
Application of nanomaterials for the mitigation of
stresses such as drought has been examined for
different farming systems (El-Ramady et al. 2023)
and for the concept of “farm-to-fork” (Abdalla et al.
2022). Suggested mechanisms of NM function are
summarized in Table 2. The general mechanism
includes increased tolerance to drought stress by
increasing plant enzyme activities and reducing the
generation of ROS. Extensive additional research is
needed to understand the underlying physio-
biochemical and molecular mechanisms of NMs,
their translocation and accumulation in plants,
groundwater, the soil microbial community, farm
animals, and humans under drought conditions.
7. Conclusions
Drought stress has the ability to cause serious
damage to cultivated plants both directly and/or
indirectly. Drought limits nutrient and water uptake,
decreases net photosynthesis, and leads to
disturbances in plant enzyme activities and
metabolism. Indirect impacts include disturbances
in nutrient uptake balance, intensification of
oxidative stress, and impacts on water and food
resources as well as human health. Furthermore,
drought stress can reduce the growth and yield
production of many crops. In the last few decades,
numerous efforts have been made to find
multilateral solutions for integrated drought
management. This may reflect on many global
issues such as exploring new soil and water
resources, expanding agricultural lands, and
enhancing crop productivity under challenging
environmental conditions. Nano-management of
drought stress is considered a promising and
sustainable solution, especially if using biological
or green nanomaterials. However, an intensive
application of engineered materials may lead to
pollution and nanotoxicity. Thus, in all drought-
prone nations, drought management should be
considered an urgent need with a focus on reducing
drought risks. This requires convincing natural
resource managers and policy makers to adopt a
proactive approach to managing drought conditions.
The right drought management should be
considered a potential tool to sustain food
production and security under soil resource-limited
conditions.
Ethics approval and consent to participate: This
article does not contain any studies with human
participants or animals performed by any of the
authors.
Conflicts of interest: The authors declare no
conflicts of interest.
Contribution of Authors: All authors shared in
writing, editing, revising, and approving the
manuscript for publication.
Consent for publication: All authors declare their
consent for publication.
Funding: The research was supported by the
Stipendium Hungaricum Scholarship Program.
Acknowledgments: All authors thank their
institutions for the great support and
publication.
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... The fast biological synthesizing of zinc nanoparticles with jojoba oil is an environmentally safe, easy, and efficient technique for nanoparticle synthesis. Using jojoba oil eliminates the need for hazardous and toxic reducing and stabilizing agents found in other chemical components (Ashour et al., 2023 andSári et al., 2024a). Jojoba oil consists of 60% wax esters, composed of fatty acids and alcohols with chain lengths ranging from C20 to C26 (Wenning et al., 2019). ...
... Nano-fertilizers play an important role in plant nutrition, through their applying to soil and foliar spraying on the vegetative system (Singh et al. 2024a, b). Many benefits have reported on the applied nano-fertilizers particularly under stressful conditions (Shalaby et al. 2022a), such as drought (Sári et al. 2024a), climate change (Sári et al. 2024b), salinity (Sári et al. 2023;Singh et al. 2023c;El-Ramady et al. 2024;Mahawar et al. 2024), nutrient deficiency (El-Bialy et al. 2023), and biotic stress (Tortella et al. 2023) for sustainable agriculture (Singh et al. 2023b). Nanofertilizers are promising candidates for sustainable agriculture, and nano-farming approach particularly the biological nanofertilizers . ...
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