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Article

Potential Impacts of Clove Essential Oil Nanoemulsion as Bio Fungicides against Neoscytalidium Blight Disease of Carum carvi L.

by
Amr H. Hashem
1,
Amer M. Abdelaziz
1,*,
Mahmoud M. H. Hassanin
2,
Abdulaziz A. Al-Askar
3,
Hamada AbdElgawad
4 and
Mohamed S. Attia
1,*
1
Botany and Microbiology Department, Faculty of Science, Al-Azhar University, Cairo 11884, Egypt
2
Ornamental, Medicinal and Aromatic Plant Disease Department, Plant Pathology Research Institute, Agricultural Research Center (ARC), Giza 12619, Egypt
3
Department of Botany and Microbiology, Faculty of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
4
Integrated Molecular Plant Physiology Research (IMPRES), Department of Biology, University of Antwerp, 2000 Antwerp, Belgium
*
Authors to whom correspondence should be addressed.
Agronomy 2023, 13(4), 1114; https://doi.org/10.3390/agronomy13041114
Submission received: 7 March 2023 / Revised: 4 April 2023 / Accepted: 10 April 2023 / Published: 14 April 2023
(This article belongs to the Special Issue Advances in Plant–Fungal Pathogen Interactions)
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Abstract

:
Fungal plant diseases are considered one of the most destructive diseases for plants. In this current study, Neoscytalidium dimidiatum as a fungal plant pathogen was isolated from an infected Carum carvi L. plant (C. carvi) for the first time and controlled it using clove essential oil nanoemulsion (CEONE). This fungal plant pathogen was identified morphologically and genetically, then deposited in the gene bank under accession number OQ338188. CEONE was prepared and characterized using DLS, Zeta potential, and TEM analysis. The characterization results illustrated that the size of CEONE was lower than 100 nm, which was confirmed by TEM, which appeared spherical in shape. Results revealed that CEONE has promising antifungal activity towards N. dimidiatum, where inhibition percentages of CEONE at concentrations of 5000, 3000, and 1000 ppm were 82.2%, 53.3%, and 25.5%, respectively. At the pot level, N. dimidiatum was highly virulent on C. carvi, and CEONE and CEO were highly effective against N. dimidiatum blight disease, with 71.42% and 57.14% protection, respectively. Moreover, results revealed that there was a vast improvement in root length, plant height, and leaves. Additionally, the application of CEONE and CEO induced plant resistance by modifying proline, phenol, hydrogen peroxide, malondialdehyde, and antioxidant enzymes. In conclusion, N. dimidiatum was highly virulent on C. carvi but can be effectively reduced by CEONE through the eco-friendly method.

1. Introduction

C. carvi is a medicinal, commercial, and economically vital plant with many benefits and medicinal importance [1]. Among the many benefits of C. carvi, this herb was used by the ancient Egyptians, Greeks, Romans, and Arabs. Ripe seeds contain volatile C. carvi oil, which contains carvone, limonene, and proteins that aid digestion, repel gases, and are analgesics for colic [2,3]. C. carvi suffers from a group of diseases that affect plant growth and production and reduce its market value [4]. The soil, whether organic or conventional, is a source of pathogenic fungi that cause human and plant diseases, including Fusarium, Alternaria, Curvularia, and Neoscytalidium dimidiatum [5,6]. N. dimidiatum is common and has a wide range of plant hosts, such as Peltophorum pterocarpum and Thespesia populnea [7]. Symptoms of this fungus include citrus branch wilt, decline, and death [8]. N. dimidiatum can be controlled by the chemical fungicides Protifert, Cidely Top, and Amistrar Top, both in vitro and in vivo [9]. The eradication of plant diseases in order to maintain the economic importance of cultivated plants is very important, but it is necessary to find alternatives to chemical pesticides that are no less dangerous than the disease itself [10,11,12]. The application of plant extracts (PE) is a unique way to combat plant diseases [13,14]. Plants have interior resistance tools that can be encouraged using biological or natural inducers [15,16,17]. The usage of nanomaterials, especially biologically prepared nanomaterials, in the field of agriculture, with the aim of increasing plant yield and increasing plant resistance against biotic and abiotic plant stresses, is unique of the greatest advanced important methods [18,19]. Recently, systemic resistance has gained wide attention, and thought has begun to turn towards finding natural stimulants that have the capability to combat pathogenic microbes with simultaneous induction of systemic resistance in the plant [20,21,22]. Aromatic PE containing oils full of antioxidants, phenolics, and antimicrobials showed success against phytopathogenic fungi and marked improvement in plant health [23,24,25]. Vegetable oil emulsion has been used in recent periods to increase plant production and raise the efficiency of plant growth obstacles because it contains plant-stimulating substances in nano-form, which gives it very high efficiency and does not negatively affect the environment or human strength [26,27]. The highest goal of this work is to evaluate the virulence of N. dimidiatum on the Carum carvi L. plant and to evaluate CEONE as an alternative biofungicide against N. dimidiatum on Carum carvi L.

2. Materials and Methods

2.1. Isolation of the Pathogen

Infected C. carvi plants were collected from Abshaway (Fayoum governorate, Egypt). The isolation of pathogens takes place according to Purdy [28]. Infected stems were washed repeatedly with tap water several times, cut into 1 cm2 and superficially sterilized with 1% NaClO for 120 s, splashed with sterilized water, and dried with sterilized filter papers, then plated onto potato dextrose agar (PDA) medium, and incubated at 27 ± 1 °C for 7 days. Lastly, growing fungi were purified using hyphal tip techniques.

2.2. Identification of the Phytopathogenic Fungus

Macroscopic morphological features, including color, texture, pigmentation, growth rate, and diameter of colonies, and microscopic characteristics, including vegetative and reproductive components of the pathogen, were noted. The fungal isolate was identified based on the description of their pycnidial and mycelial anamorphs [29,30,31]. DNA extraction was carried out using a mini-preparation technique. Using a sterile loop, a loopful of fungal mycelia was aseptically put into a 1.5 mL Eppendorf tube that already contained 500 µL of lysis buffer (400 mM Tris-HCl [pH 8.0], 60 mM EDTA [pH 8.0], 150 mM NaCl, and 1% sodium dodecyl sulphate). The tube was then kept at room temperature for 10 min. After adding 150 µL of potassium acetate, pH 4.8 (5 M potassium acetate 60 mL, glacial acetic acid 11.5 mL, and distilled water 28.5 mL), the tube was quickly vortexed and then centrifuged at 10,000× g for 1 min to remove the cellular debris and precipitated proteins. The supernatant was poured into a second 1.5 mL Eppendorf tube and centrifuged once more than before. An equivalent volume of isopropyl alcohol was added when the supernatant was transferred to a fresh 1.5 mL Eppendorf tube. After a quick inversion mix, the tube was centrifuged at 10,000× g for 2 min, and the supernatant was discarded. The final DNA pellet was cleaned in 300 µL of 70% ethanol. The supernatant was discarded after being centrifuged for one minute at 10,000× g [32]. EZ-10 Spin Columns (BioBasic Inc., Markham, ON, Canada) was filled with the DNA pellet and centrifuged at 10,000× g for 10 min. The eluted DNA was kept at −20 °C after being eluted in 50 µL of 1x TE buffer. The Gene JET PCR Purification Kit (Thermo K0701, Boston, MA, USA) was used to purify the PCR product according to the manufacturer’s instructions. The internal spacer region was amplified with primers ITS1 (5′-TCC GTA GGT GAA CCT GCG G-3′) and ITS4 (5′-TCC TCC GCT TAT TGA TAT GC-3′), internal spacer regions were amplified using the PCR (http://willowfort.co.uk/, accessed on 6 March 2023). A volume of 25 µL of the master mix PCR, 0.16 mM of each deoxyribonucleoside triphosphate, 5 µL of Taq DNA polymerase buffer, 2.5 U of intron master mix (i-Taq TM) Taq DNA-dependent DNA polymerase, 0.2 mM of each primer, and 1 g of genomic DNA as template were included in the reaction volume of 50 µL. A 3 min initial denaturation at 95 °C was followed by 35 cycles of primer annealing at 50 °C for 1 min, denaturation at 95 °C for 1 min, and elongation at 72 °C for 2 min. The last extension stage was carried out for 10 min at 72 °C. Instead of template DNA, sterile deionized water was used as the negative control. A 1X TBE buffer (Tris base/boric acid/EDTA) was used to make red-safe-dyed agarose gel (1.5%) for the experiment. The bands produced by agarose gel electrophoresis were seen under UV light after being conducted at 100 V. Prior to usage, PCR products were kept at 20 °C. The resulting PCR products were sequenced by sequencing ready reaction kit (Applied Biosystems, Foster, CA, USA) in macrogene company (10F, 254, Beotkkot-ro, Geumcheon-gu, Seoul Gasan-dong, World Meridian I). Evolutionary study was directed at molecular evolutionary genetics analysis MEGA-5 software [33].

2.3. Preparation of CEONE

CEO was0 extracted according to method used by Al-Shahrani, Mahfoud [34]. A volume of 10 mL of CEO and 5 mL of non-ionic surfactant Tween 80 were added slowly with gentle stirring until a homogeneous mixture formed. Then, water (85 mL) was added to reach the final mixture of each CEO to 100 mL, then stirred using a magnetic stirrer for 30 min. The mixture was sonicated for 30 min at 350 W, and all treated CEOs were placed in an ice bath during the time of work. CEO was prepared, as mentioned above, before without sonication.

2.4. Characterization of CEONE

The measurement of droplet size of CEONE was performed by a dynamic light scattering analysis using Zeta Nano ZS (Malvern Instruments, Worcestershire, UK) at 27 °C. Prior to measurement, 30 μL of CEONE was diluted with 3 mL of water at 25 °C. The CEONE particle size data were expressed as the mean of the Z-average of three independent batches. The droplet size and the poly disparity index (PDI) of the formulated CEONE were measured [35]. The Zeta potential measurement was performed by (NanoZS4700 nano series, Malvern Instruments, Worcestershire, UK) in distilled water, which was adjusted to a conductivity of 50 µS/cm with a 0.90% (w/v) sodium chloride solution. To carry out TEM, 20 microliters of diluted sample were placed on a film-coated 200-mesh copper specimen grid for 10 min, and the excess fluid was eliminated using filter paper. The grid was then stained with 1 drop of 3% phosphotungstic acid and allowed to dry for 3 min. The coated grid was dried and examined under the TEM microscope (Tecnai G20, Super twin, double tilt, FEI, Hillsboro, OR, USA), operating at 200 kV [36].

2.5. Antifungal Activity of CEONE

The activity of CEONE against N. dimidiatum was determined using the radial growth method [16]. CEONE was added to sterilize PDA flasks before solidifying to obtain the proposed concentrations of 1000, 3000, and 5000 ppm (v/v). Negative control was performed without addition of CEONE, but positive control was carried out by adding difenoconazole fungicide. The bactericide (Chloramphenicol, 0.1 mg/L) was added to the medium to avoid bacterial contamination. All plates for each treatment were inoculated, then incubated at 25 ± 1°. Linear growth of the fungus was measured when mycelial growth of fungus filled a plate of its control. Reduction in fungal growth was calculated according to the following equations:
Inhibition   % = A − B A × 100
where A means the linear growth in control without CEONE and B means the linear growth of treated fungus.

2.6. Pathogenicity Test

The pathogenesis experiment was conducted to prove the ability of the fungus to cause infection. The pathogenicity test was performed on 10 replications of healthy C. carvi seeds germinated in the Faculty of Science at Al-Azhar University. N. dimidiatum fungus was cultured on autoclaved sorghum grains medium (100 g corn + 50 g washed sand + 100 mL water) at 27 °C for 15 days. Soil infestation with above-isolated fungus was applied at the rate of 1% w/w (fungus/soil) in pots 30 cm in diameter. The infection took place in the soil in which it was grown, on three seeds per pot. Plants were evaluated for symptoms and disease progression. Once disease symptoms appeared, fungi were isolated from infected stems on a PDA and compared to inoculated fungus.

2.7. Pot Experiment

Seeds of C. carvi germinated and were sown to obtain seedlings; 3 seedlings (45 days old) per pot (30 cm in diameter) containing a mixture of sand and clay (1:3 w/w) with a total weight of 4 kg were sown. The pots were distributed with 10 replicates for each treatment. The management was organized as follows: T1—healthy control, T2—infected control, T3—infected plants treated with CEO at the rate of 5 mL/L water, T4—infected plants treated with CEONE at the rate of 5 mL/L water, and T5—infected plants treated with Difenoconazole fungicide at the rate of 3 mL/L water. Pathogenicity was performed as previously described, and plants were sprayed with treatments after 1 week of cultivation (20 mL per plant once every week for 3 weeks) to assess plant resistance, record disease symptoms, and take samples for biochemical tests from plant samples 45 days after infection.

2.8. Morphological Indicators of Resistance

2.8.1. Disease Index

The disease index is considered the first and most basic criterion for the extent of disease development as well as for the direct determination of the extent of the efficiency of treatments to control plant disease. DI and protection were evaluated by the following equation: percent disease index (PDI) = (1n1 + 2n2 + 3n3 + 4n4)100/4nt, where n1–n4 represents the number of plants in each class and nt is the total assayed plants. Protection% = A − B/A 100, where A is the percent disease index (PDI) in infected plants, and B is the PDI in treated infected plants [37]. Disease symptoms were recorded 45 days after infection, and disease severity and protection ratio were calculated, as described using 5 score classes: 0 (no symptoms), 1 (slight yellow of leaves), 2 (moderate yellow plant), 3 (chlorosis), and 4 (canker and completely destroyed).

2.8.2. Plant Growth

Three random plants from each treatment were used to determine the following growth parameters: plant height (cm), root length (cm), and number of leaves per plant.

2.8.3. Metabolic Indicators for C. carvi Resistance

The physiological characteristics are clearly affected when there is any plant disease and an imbalance and deviation from the normal rate occur. Free proline was estimated by the method of Bates et al. [38], but the method of Dai et al. [39] was applied to measure the plant phenolics. The procedure of [40] was used to assay the MDA content in fresh plant leaves. Fresh C. carvi leaves also were established for hydrogen peroxide H2O2 content [41]. Accepted method of Srivastava [42] was used to determine POD. The activity of PPO enzyme was splendid using the technique of Matta [43].

2.9. Statistical Analysis

A one-way analysis of variance (ANOVA) was applied to the resulting data. LSD by CoStat (CoHort, Monterey, CA, USA) was applied to demonstrate statistically relevant variances at p < 0.05 [44].

3. Results and Discussion

Caraway (Carum carvi L.) is widely cultivated all over the world. It is among the widely used spices as crude or essence in various food products for its pleasant flavor and antispoilage properties. However, the economic importance of C. carvi always suffers from different fungal diseases. In this current study, both healthy (Figure 1A) and infected C. carvi were collected, where the infected appeared weak and had black lesions on the stem and leaves (Figure 1B). Additionally, infected C. carvi was examined microscopically, where results illustrated that it was infected with Neoscytalidium sp. (Figure 1C).

3.1. Morphological and Molecular Identification of the Isolate Pathogen

This fungal isolate was isolated from a C. carvi plant and identified morphologically and genetically, as illustrated in Figure 2. Morphological identification of the fungal isolate on PDA medium illustrated that the fungus appeared white to olive green in color with grey to black pigmentation (Figure 2A,B). Furthermore, the fungus appeared to grow quickly, with a diameter of 40–50 mm. Conidia were appeared septated with brown coloration and rod-shaped as they matured (Figure 2C). To confirm the morphological identification, molecular identification was carried out. Results revealed that the fungal isolate was identified as N. dimidiatum with a similarity of 99% according to a BLAST search on NCBI. Additionally, this sequence was deposited in the Gene Bank with accession number OQ338188. To our knowledge, this is the first report to isolate N. dimidiatum from a Carum carvi plant. In a previous study, N. dimidiatum was isolated from red-fleshed dragon fruit (Hylocereus polyrhizus) in Malaysia, which causes stem canker [45]. Additionally, Derviş, Özer [46] isolated N. dimidiatum from infected potatoes in Turkey, which is causing tuber rot in potatoes.

3.2. Characterization of CEONE

3.2.1. DLS and Zeta Potential

The effect of ultrasonication on the droplet size of CEONE was determined. (Figure 3A) shows the stable CEONE prepared by the ultrasonication method for 30 min at 350 W after 30 days of storage at room temperature. Tween 80 was used as a surfactant for its high HLB value, which favors the formulation of oil-in-water emulsions. Additionally, small molecule surfactants such as Tween 80 get rapidly adsorbed onto the emulsion droplet surface, so they are more effective in decreasing droplet diameter than polymeric surfactants [47]. The CEONE droplets were in nanoform (around 91.3 nm). The polydispersity index (PDI) for particles was good (0.448). The medium hydrodynamic diameter increased proportionally to the increase in the concentration of added clove oil, related to the increase in the internal volume of the nanoparticle occupied by the oil. This increase in internal volume indicates the increase in the supply of CO within the particle as its concentration increases. This could be also attributed to the possible changes in the organic viscosity and physicochemical properties of solvent release into water [48]. The zeta potential was also good (−46.3 mV). The decrease in particle size may depend on the ability and performance of surfactants. Stirring is known to reduce the size of droplets in an oil-in-water emulsion [49]. The fabrication of nano-emulsion with lesser droplet size in the presence of double bonds in the nonpolar chain of non-ionic surfactants was evaluated by [50,51].

3.2.2. Transmission Electron Microscopy (TEM)

The morphology of the nanoemulsion was visualized by TEM analysis, as shown in Figure 4. TEM characterization of CEONE exhibited its actual size and shape; the droplets in the nanoemulsion appeared dark. The TEM micrograph showed that CEONE was spherical in shape and moderately mono- or di-dispersed. CEONE droplets were in the range of 36.4–57.1 nm, as shown in Figure 4. The droplet size was well correlated with the results obtained from droplet size analysis using the dynamic light scattering technique [44,45].

3.3. Antifungal Activity of CEONE

The antifungal activity of CEONE toward N. dimidiatum using the radial growth method was evaluated, as shown in Figure 5. Results revealed that CEONE has promising antifungal activity towards N. dimidiatum, with decreasing linear fungal growth as CEONE concentration increased. The growth diameters of N. dimidiatum at 0 ppm, 1000 ppm, 3000 ppm, and 5000 ppm of CEONE were 100, 67, 42, and 16 mm, respectively. Moreover, CEONE at a concentration of 5000 ppm exhibited the highest inhibition among the other concentrations applied, where the inhibition percentage was 82.2%. On the other hand, inhibition percentages decreased at concentrations of 1000 and 3000 ppm, where they were 25.5% and 53.3%, respectively. The phenolic eugenol component in clove showed a high level of activity against plant pathogenic fungi [52,53]. Eugenol in clove oil acts on the cell membrane by a mechanism that seems to involve the inhibition of ergosterol biosynthesis [54]. Eugenol, known to be a lipophilic compound, can enter between the fatty acid chains that make up the membrane lipid bilayers, thus altering the fluidity and permeability of cell membranes [55,56]. CEONE inhibited not only radial growth but also sporulation and pigmentation of the pathogen. Several authors have demonstrated that eugenol in clove oil alone could reduce the growth rate of mold and also reduce mycotoxins produced by mold [57,58].

3.4. Disease Assessment

The disease incidence indicator of the plant is the first and most basic criterion for the evaluation of any plant disease, and the severity of the disease is measured depending on the severity of the symptoms. According to the data in Table 1, N. dimidiatum infection has a high disease index (DI) of 87.5%. Reducing the seriousness of the disease is the first sign of the efficacy of the tested CEO and its CEONE in stimulating plant resistance. According to the data, treatment with difenoconazole fungicide, CEONE, and CEO resulted in high protection (77.14%, 71.42%, and 57.14%, respectively), and the lowest PDI (20%, 25%, and 37.50%). This reduction in DI by application of CEO may be due to the CEO having highly antimicrobial activity through an antioxidant mechanism [59]. Many studies explained the high antifungal activity of CEO against plant pathogens [60,61].

3.5. Vegetative Growth

The morphology and external characteristics of the plant express the physiological state of the plant. When the physiological processes proceed in a healthy manner, this clearly shows the reason for the vegetative growth of the plant. On the other hand, when any deviation occurs in the growth of the plant, this indicates the presence of biotic or abiotic stresses. The results shown in Figure 6 indicate that the infection of C. carvi plants with N. dimidiatum caused a severe decrease in all morphological traits compared to the healthy control, where there is a decrease in root length, plant length, and number of leaves (53.01%, 35.29%, and 51.88%). N. dimidiatum has been found on a wide variety of plants in many countries around the world, causing wilting disease [37,62,63]. Fungal infection causes a detrimental effect on vegetative growth characteristics, which is negatively reflected in all physiological processes. Our data in the present research showed that N. dimidiatum fungus triggered a severe decrease in vegetative growth. The findings of a recent study approve of these destructive effects by infection [9,64]. This deterioration can be explained by a disturbance in the physiological processes, which results in a severe deterioration in the various growth characteristics. Inducing plant immunity using bio inductors is the ideal solution to eliminate pathogens and improve plant growth. As shown in the results in Figure 6, the use of the tested inducers (CEO, CEONE, and difenoconazole) led to the recovery of the infected plants, as they showed a significant improvement in the growth characteristics compared to the infected plants alone. Results indicated that CEONE was the best treatment, as the plants treated with CEONE recorded an increase in plant length, root length, and the number of leaves (92.3%, 48.01%, and 24.97%) compared to difenoconazole treatment (66.66%, 46%, and 20.03%) and CEO (46.1%, 23.09%, and 5.9%). This improvement can be explained by the fact that CEO and CEONE contain stimulating compounds for plant growth, in addition to their anti-fungal abilities, which induce the growth of plants under unfavorable conditions [65,66,67]. The effect of the active compounds in CEO may be directly on the fungus, as previously mentioned [57]. Therefore, it is not excluded that the effect of some compounds in the CEO and CEONE is due to the stimulation of the plant’s defensive means, which made it more resistant to the effect of fungus and corrected the physiological defect, which led to the improvement of growth characteristics [68].

3.6. Proline and Phenol Indicators

Proline and phenols are among the most important indicators of the occurrence of external stresses on the plant. They are among the indicators that change greatly when the plant is infected with diseases caused by a live or abiotic pathogen. The impact of the pathogenic fungus N. dimidiatum on the contents of proline in C. carvi plants and their management by CEO and CEONE and difenoconazole were clarified in Figure 7. Under biotic stress, plants accumulate proline for its direct role as an osmosis regulator to protect cells from free radical toxicity [69,70]. Infection with the pathogenic fungus N. dimidiatum significantly boosted proline contents in C. carvi plants by 42.93% in comparison with uninfected plants. Regarding the infected C. carvi plants, proline contents were significantly decreased in response to the application of CEONE, CEO, and difenoconazole by 25.54%, 16.57%, and 15.5%, respectively, compared with the infected control. Regarding the application of CEONE or CEO, previous studies have documented that CEO and CEONE induce systemic protection against phytopathogens [71,72,73]. Our findings are in accordance with the results of [74]; the author demonstrated that fungicide treatment increased proline levels in the infected plants. Phenolic compounds of C. carvi were affected due to the infection with N. dimidiatum and the application of CEO, CEONE, and difenoconazole. The pathogenic fungus N. dimidiatum significantly augmented the contents of phenols in C. carvi by about 14.56% relative to uninfected plants. When plants are subjected to biotic stress, phenols play a protective role [75]. An increase of phenols in the infected plants by pathogens was noted in numerous studies [76,77,78]. Additionally, in infected C. carvi, phenol contents were significantly increased relative to infected control plants in response to the application of CEONE, CEO, and difenoconazole by 83.05%, 81.35%, and 9.32%, respectively. CEO is very rich in phenolic acids, as well as being one of the most powerful natural antioxidants [79]. Antioxidants play an important role in capturing free radicals and protecting plant cells from damage, in addition to building cell walls [80,81]. Therefore, we can say that CEO and CEONE are vital stimulators of plant immunity and safe alternatives to chemical pesticides. These results recommend that each improvement or increase in proline and phenol stimulate resistance in the host to challenge the stress [82,83].

3.7. MDA and H2O2

The measurement of H2O2 and MDA are necessary indicators to determine the extent of plant disease progression because they indicate the plant’s ability to suppress free radicals that lead to the deterioration of plant growth. In Figure 8, the impact of the pathogenic fungus N. dimidiatum on the contents of H2O2 and MDA in C. carvi plants and their management by CEO, CEONE, and difenoconazole are clarified. Infection with the pathogenic fungus N. dimidiatum significantly boosted MDA and H2O2 in C. carvi plants by 71.8% and 93.1%, respectively, in comparison with uninfected plants. Biotic stresses caused oxidative stress, which led to serious disorders in the plant cell and a rise in the content of H2O2 and MDA [84,85]. Reduction of the contents of MDA and H2O2 is the key sign of the efficacy of the tested CEO and CEONE in stimulating plant resistance. Regarding the infected C. carvi, MDA and H2O2 were significantly decreased in response to the application with CEONE, CEO, and difenoconazole by (34.52%, 27.51%, and 27.37%) and (44.06%, 42.1%, and 40.88%), respectively, compared with the infected control. Our results in this current study indicated that the addition of CEONE and CEO to the challenged C. carvi presented a significant reduction in the content of H2O2 and MDA, and this can be explained by the capability of CEONE to stimulate resistance by accumulating the antioxidants responsible for protection [86,87].

3.8. Antioxidant Enzymes Activity

Antioxidant enzymes (AOE) are among the most important indicators through which we can observe the virulence of the plant disease as well as the extent of the efficacy of the treatments on the severity of the plant disease. So, the activity of POD and PPO enzymes was measured, using it to note the severity of the C. carvi blight disease. The impact of the pathogenic fungus N. dimidiatum on the activities of (AOE) (POD and PPO) in C. carvi and their management by CEO, CEONE, and difenoconazole are clarified in Figure 9. Infection with the pathogenic fungus N. dimidiatum significantly boosted the activities of antioxidant enzymes (AOE) POD and PPO in C. carvi by 126% and 68.57%, respectively, in comparison with uninfected plants. Numerous (AOE) has been correlated with disease [88,89]. Interestingly, results in Figure 9 indicated that the addition of CEONE as well as COE to infected plants stimulated the activation of AOE more than the fungicide, compared with the infected control. The plant presented various approaches to managing disease as they boost the activity of AOE to hold ROS at a reduced level in the cell [90].

4. Conclusions

In this current study, the fungus N. dimidiatum was isolated from C. carvi for the first time. This strain was identified morphologically and genetically. Furthermore, CEONE was prepared using an eco-friendly method and then characterized using DLS, Zeta potential, and TEM analyses. The characterization results revealed that the size of CEONE was lower than 100 nm, which was confirmed by TEM, where it appeared spherical in shape. Antifungal results illustrated that CEONE exhibited promising antifungal activity against N. dimidiatum. In an in vivo study, it was shown that C. carvi can be extremely affected by the N. dimidiatum fungus through high DI, a severe reduction in vegetative growth, and physiological markers, including proline, protein, H2O2, MDA, POD, and PPO enzymes by application of both CEO and CEONE. Through antagonistic activity and induced plant resistance, CEO and CEONE can reduce the harmful effects of N. dimidiatum.

Author Contributions

Conceptualization, A.H.H., A.M.A., M.M.H.H. and M.S.A.; Methodology, A.H.H., A.M.A., M.M.H.H. and M.S.A.; Software, A.H.H. and A.M.A.; Formal analysis, M.M.H.H., A.A.A.-A., H.A. and M.S.A.; Investigation, A.H.H., A.M.A., M.M.H.H., A.A.A.-A., H.A. and M.S.A.; Resources, A.H.H. and A.M.A.; Data Curation, A.H.H., A.M.A., M.M.H.H. and M.S.A.; Writing—original draft preparation, A.H.H., A.M.A., M.M.H.H. and M.S.A.; Writing—Review and Editing, A.H.H., A.M.A., M.M.H.H., A.A.A.-A., H.A. and M.S.A.; Supervision, A.H.H., A.M.A., M.M.H.H. and M.S.A. All authors have read and agreed to the published version of the manuscript.

Funding

The authors extend their appreciation to the researcher supporting project number (RSP2023R505), King Saud University, Riyadh, Saudi Arabia, for funding publication fees.

Data Availability Statement

All data and materials are available.

Acknowledgments

The authors would like to thank the Botany and Microbiology Department, Faculty of Science, Al-Azhar University, for promoting this research. Ornamental, Medicinal and Aromatic Plant Disease Department, Plant Pathology Research Institute, Agricultural Research Center (ARC), Giza, Egypt. Additionally, the authors extend their appreciation to the researcher supporting project number (RSP2023R505), King Saud University, Riyadh, Saudi Arabia, for funding this work.

Conflicts of Interest

The authors declare no conflict of interest.

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Figure 1. Healthy Carum carvi plant (A), Stem and foliar blight symptoms on Carum carvi plants (B), N. dimidiatum under light microscope (400×) (C).
Figure 1. Healthy Carum carvi plant (A), Stem and foliar blight symptoms on Carum carvi plants (B), N. dimidiatum under light microscope (400×) (C).
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Figure 2. Identification of N. dimidiatum includes surface (A), reverse color and pigmentation on PDA (B), conidia under a light microscope (C), and a phylogenetic tree (D).
Figure 2. Identification of N. dimidiatum includes surface (A), reverse color and pigmentation on PDA (B), conidia under a light microscope (C), and a phylogenetic tree (D).
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Figure 3. DLS of CEONE (A) and zeta potential of CEONE (peak at—46.3 mV) (B).
Figure 3. DLS of CEONE (A) and zeta potential of CEONE (peak at—46.3 mV) (B).
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Figure 4. Transmission electron microscopic image of CEONE.
Figure 4. Transmission electron microscopic image of CEONE.
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Figure 5. Effect of different concentrations of CEONE on radial growth (A,B), and inhibition % (C) of N. dimidiatum. Letters a,b,c,d mean power of significance.
Figure 5. Effect of different concentrations of CEONE on radial growth (A,B), and inhibition % (C) of N. dimidiatum. Letters a,b,c,d mean power of significance.
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Figure 6. Effect of CEO and CEONE on vegetative growth of C. carvi metabolic indicators. Letters a,b,c,d,e mean power of significance.
Figure 6. Effect of CEO and CEONE on vegetative growth of C. carvi metabolic indicators. Letters a,b,c,d,e mean power of significance.
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Figure 7. Effect of CEO and CEONE on proline and phenol content of C. carvi. Letters a,b,c,d,e mean power of significance.
Figure 7. Effect of CEO and CEONE on proline and phenol content of C. carvi. Letters a,b,c,d,e mean power of significance.
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Figure 8. Effect of CEO and CEONE on MDA and H2O2 content of C. carvi. Letters a,b,c,d,e mean power of significance.
Figure 8. Effect of CEO and CEONE on MDA and H2O2 content of C. carvi. Letters a,b,c,d,e mean power of significance.
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Figure 9. Effect of CEO and CEONE on PPO and POD content of Carum carvi. Letters a,b,c,d,e mean power of significance.
Figure 9. Effect of CEO and CEONE on PPO and POD content of Carum carvi. Letters a,b,c,d,e mean power of significance.
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Table
Table 1. Protection of CEO and CEONE and difenoconazole against N. dimidiatum.
Table 1. Protection of CEO and CEONE and difenoconazole against N. dimidiatum.
TreatmentsDisease Indicators LevelsDI (Disease Index) (%)Protection (%)
01234
Control infected.0005587.50
Infected plants treated with CEO3320237.5057.14
Infected plants treated with CEONE 424002571.42
Infected plants treated with difenoconazole fungicide.540012077.14
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MDPI and ACS Style

Hashem, A.H.; Abdelaziz, A.M.; Hassanin, M.M.H.; Al-Askar, A.A.; AbdElgawad, H.; Attia, M.S. Potential Impacts of Clove Essential Oil Nanoemulsion as Bio Fungicides against Neoscytalidium Blight Disease of Carum carvi L. Agronomy 2023, 13, 1114. https://doi.org/10.3390/agronomy13041114

AMA Style

Hashem AH, Abdelaziz AM, Hassanin MMH, Al-Askar AA, AbdElgawad H, Attia MS. Potential Impacts of Clove Essential Oil Nanoemulsion as Bio Fungicides against Neoscytalidium Blight Disease of Carum carvi L. Agronomy. 2023; 13(4):1114. https://doi.org/10.3390/agronomy13041114

Chicago/Turabian Style

Hashem, Amr H., Amer M. Abdelaziz, Mahmoud M. H. Hassanin, Abdulaziz A. Al-Askar, Hamada AbdElgawad, and Mohamed S. Attia. 2023. "Potential Impacts of Clove Essential Oil Nanoemulsion as Bio Fungicides against Neoscytalidium Blight Disease of Carum carvi L." Agronomy 13, no. 4: 1114. https://doi.org/10.3390/agronomy13041114

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