Perumal Vivekanandhan
Kannan Swathy
Tahani Awad Alahmadi3- 1Department of General Pathology, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha University, Chennai, Tamil Nadu, India
- 2Society for Research and Initiatives for Sustainable Technologies and Institutions, Ahmedabad, Gujarat, India
- 3Department of Pediatrics, College of Medicine and King Khalid University Hospital, King Saud University, Riyadh, Saudi Arabia
- 4Department of Botany,.Hindu College Moradabad (Mahatma Jyotiba Phule Rohilkhand University Bareilly), Moradabad, Uttar Pradesh, India
In this study, we conducted tests on the isolation, identification, characterization, and extraction of chemical molecules from Beauveria bassiana against Tuta absoluta larvae. The enzyme responses of T. absoluta to the crude extract were examined 24 h after treatment, and the number of dead larvae was calculated 24 and 48 h after treatment. Molecular docking studies were conducted to assess the interaction of important molecules with the acetylcholinesterase enzyme. The larvicidal activity of crude chemicals from fungi was high 24 h after treatment, with LC50 and LC90 values of 25.937 and 33.559 μg/mL, respectively. For a period of 48 h, the LC50 and LC90 values were 52.254 and 60.450 μg/mL, respectively. The levels of acetylcholinesterase, α-carboxylesterase, and β-carboxylesterase enzymes were lower in the treatment group after 24 h compared to the control group. The GC-MS test revealed that the crude extract consisted mainly of 9,10-octadecadienoic acid, which was the primary compound. Docking results indicated that 9,10-octadecadienoic acid showed a strong interaction with acetylcholinesterase (AChE). Our findings suggest that the chemical molecule 9,10-octadecadienoic acid derived from the entomopathogenic fungus B. bassiana is more toxic to T. absoluta larvae. We plan to conduct studies to test its effectiveness in semi-field conditions and to evaluate its stability in field conditions. We believe that this 9,10-octadecadienoic acid molecule could be used to control T. absoluta larvae in the near future without causing environmental pollution.
1 Introduction
Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae), a major tomato pest native to western South America, was first reported in Brazil around 1980 (Souza and Reis, 1992). It has become a significant pest of tomato crops in South America, Europe, Africa, India, and other Asian countries (Tropea Garzia et al., 2012; Zappala et al., 2013). This pest is spreading across borders and causing significant damage to tomato production in both greenhouse and open fields (Fera et al., 2009). Tuta absoluta larvae can cause damage to fruits, flowers, stems, and leaves, and also affect the development of crop growth (Biondi et al., 2018). By feeding on the mesophyll and moving in and out of the leaves, a single larva can damage entire plants (Gözel and Kasap, 2015). This insect pest can produce up to 12 generations under favorable climatic conditions, which increases its invasiveness (Biondi et al., 2018). This insect pest can cause yield losses of up to 100% of total production (Desneux et al., 2010).
Chemical control methods have resulted in numerous side effects on human health and the environment, as well as accumulation in soil conditions. When various chemical insecticides, such as permethrin, cypermethrin, monocrotophos, and malathion, are repeatedly used, insects develop resistance to these chemical pesticides (Metcalf, 1989; Gahukar and Kishore, 1995; Vivekanandhan et al., 2021). As a result, various methods of controlling insects using secondary metabolites from plants, bacteria, and fungi have shown greater efficacy (Balumahendhiran et al., 2019; Logeswaran et al., 2019; Pratheeba et al., 2019; Vivekanandhan et al., 2022a,b; Chinnasamy et al., 2023; Kannan et al., 2023; Krutmuang et al., 2023; Perumal et al., 2023a,b,c).
Numerous studies have investigated entomopathogenic fungi, conidia, and their chemical components for controlling T. absoluta insect pests, demonstrating their high effectiveness (Zekeya et al., 2019; Bali and Singla, 2022). The entomopathogenic fungi B. bassiana and Metarhizium anisopliae have shown greater virulence against a wide range of medical and agricultural insect pests (Contreras et al., 2014; Gebremariam et al., 2021; Wang et al., 2021; Bapfubusa Niyibizi et al., 2023; Sharma et al., 2023; Swathy et al., 2023; Vivekanandhan et al., 2023). The cuticle-degrading enzyme chitinase, derived from the entomopathogenic fungi B. bassiana, exhibited remarkable insecticidal activity within 5 days against larvae of B. dorsalis (Ullah et al., 2023). The conidia of B. bassiana and M. anisopliae fungi, along with their chemical constituents, have been shown to be effective against T. absoluta larvae (Tadele and Emana, 2017; Bali et al., 2023; Giannoulakis et al., 2023). In the current study, chemical molecules were extracted from B. bassiana, and their toxic effectiveness was tested on T. absoluta larvae in the laboratory. Additionally, molecular docking studies were conducted to investigate the interaction of major molecules with the enzyme acetylcholinesterase.
2 Materials and methods
2.1 Soil sample
Five soil samples were collected from the rhizosphere areas of healthy cotton plants (Gossypium herbaceum L) in Tamil Nadu, India (11.1271° N, 78.6569° E). Soil samples weighing 2.5 kg were collected from depths ranging from 1 to 20 cm and combined, as reported by Vivekanandhan et al. (2020). The soil collected was stored in a sterile bag at 4°C for the subsequent isolation of entomopathogenic fungi.
2.2 Insect bait techniques
The soil sample mentioned above was subjected to insect baiting to isolate entomopathogenic fungi, which were subsequently identified using our earlier methodologies and others (Vivekanandhan et al., 2021; Mathulwe et al., 2023). The bait method employing third-instar larvae of Tenebrio molitor is an exceptionally sensitive technique used to isolate insect pathogenic fungi from soil. Fifteen T. molitor larvae in their third instar were transferred to a plastic container with 300 g of soil, measuring 15 cm (L) × 10 cm (W) × 10 cm (H). After securing the container with a lid, it was placed in an incubator set at 26 ± 1°C and 85% relative humidity. For 15 days, plastic containers were observed twice daily. After collecting the larval cadavers and sterilizing them for 2–3 min with 70% ethanol, the sterile cadavers were transferred to Petri plates (90 mm × 15 mm) containing pre-prepared potato dextrose agar medium PDA (HiMedia, India) (Perumal et al., 2023a). Plates were kept at a relative humidity of 85% and a temperature of 26 ± 2°C for 7 to 10 days. The pure fungal cultures were isolated from the dead larval cadaver according to Balumahendhiran et al. (2019) and Vivekanandhan et al. (2023) and preserved in a biochemical oxygen demand incubator (BOD) (Smartscience, India) at 26 ± 2°C for future experiments.
2.3 Morphological confirmation
We first confirmed the morphology of the fungi species by microscopic observations of the fungal colony, pigment production, mycelium structures, and spore shape, following the steps we described in Kumar et al. (2023) and Vivekanandhan et al. (2023). On the clean slide, one drop of lactophenol cotton blue (LCB) stain (HiMedia, India) was mixed with one loop of fungal conidia and thoroughly blended. The prepared glass slides (Borosil, India) were then examined using an Olympus CH20i/India light microscope set to 40× magnification.
2.4 Culturing of fungi
The genomic DNA of entomopathogenic fungi was extracted following the method outlined in our previous study (Vivekanandhan et al., 2021; Kumar et al., 2023). A 150-mL conical flask (Borosil, India) containing fungal genomic DNA was prepared with 100 mL of potato dextrose broth (PDB) (HiMedia, Tamil Nadu, India) and autoclaved for 15 min at 120°C. Afterward, the culture media was transferred to a laminar airflow chamber (LAF) with aseptic conditions and cooled, and then 1 × 109 conidia were transferred into the culture medium. As an additional antibacterial measure, 1 ml of chloramphenicol was added during conidial inoculation. The resulting mixture was then incubated at 28 ± 1°C for 5–7 days to promote fungal growth.
2.5 Molecular level confirmation
2.5.1 DNA extraction
After being allowed to grow for 5–7 days, the fungal mycelia were filtered through Whatman No. 1 filter paper (HiMedia, India), and genomic DNA was extracted using a fungal mat following the methods described by Kumar et al. (2023). One gram of fungal biomass was lysed in a sterile mortar and pestle with the addition of liquid nitrogen. Once the mycelium was broken up, 2.5 ml of freshly prepared cetyltrimethylammonium bromide (CTAB) lysis buffer was added. The solution was then transferred to clean microtubes. The microtubes were incubated at 60°C for 1 h in a water bath. After incubation, the microtubes were centrifuged at 8,500 rpm for 15 min and then kept at 4°C for 18 min. Following centrifugation, the supernatant was transferred to fresh tubes with a 24:1 ratio of isoamyl alcohol to chloroform. The mixture was gently shaken until an emulsion formed. Twenty minutes later, the microtubes were centrifuged at 13,000 rpm, and the supernatant was transferred to fresh tubes. After mixing 90% ethanol with an equal volume of ice-cold isopropanol, microtubes were incubated at 25°C for 1 h. After collecting the genomic DNA pellet in new tubes, the microtubes were centrifuged at 13,500 rpm for 20 min following the incubation. In conclusion, we used 70% ethanol to purify the genomic DNA. Following the steps outlined by Kumar et al. (2023), the genomic DNA’s purity was checked using 0.8% agarose gel electrophoresis after the ethanol was taken out.
2.5.2 Polymerase chain reaction (PCR)
Forward (GTAGTCATATGCTTGTCTC) and reverse (CTTCCGTCAATTCCTTTAAG) universal primers were utilized to amplify fungal genomic DNA (NS1 and NS2), following the procedures outlined by Kumar et al. (2023). For PCR amplification, a 20 μL reaction volume was used. The reaction mixture contained 1 μl of genomic DNA, 0.2 μl of II DNA polymerase enzyme, 0.1 mg/ml BSA, 3% DMSO, 0.5 M Betaine, and 0.2 mM of each dNTP (dATP, dGTP, dCTP, and dTTP). The PCR procedure consisted of the following stages: annealing at 50°C for 30 s, extension at 72°C for 7 min, and elongation at 72°C for 2 min.
2.5.3 Fungal sequence
The DNA of the entomopathogenic fungus was sequenced at Chromous Biotech Pvt. Ltd, Chennai, India. Sequence outcomes were compared to the GenBank databases using BLAST analysis. The entire species was identified using data obtained from the NCBI GenBank database. Following that, the organisms’ order was synchronized with IN-5 using the CLUSTAL W program. CLUSTALW (BioEdit) (Hall, 1999) is used for aligning multiple sequences. The nucleotide and amino acid sequence homology was determined using MegAlign (DNA Star, Inc., Madison, WI, United States). The fungal sequence was submitted to GenBank (National Centre for Biotechnology Information, NCBI). Phylogenetic analysis was done with MEGA5 software (Tamura et al., 2011), which built a distance matrix and used the neighbor-joining (Saitou and Nei, 1987) methods.
2.6 Entomopathogenic fungi B. bassiana
Entomopathogenic fungi B. bassiana (GenBank: OM346715.1) were sub-cultured on sterilized PDA fungal culture medium with ampicillin (2.7 mg/100 mL) and incubated at 26 ± 2°C for 7–10 days. The liquid broth culture medium for mass culturing of fungi was prepared using our previously established method (Vivekanandhan et al., 2023). Four 500-mL conical flasks were sterilized at 15 psi for 30 min, each containing 250 mL of potato dextrose broth (PDB), composed of 20 g of dextrose, 5 g of peptone, and 1,000 mL of deionized water. The broth media was fortified with 30 mg of ampicillin, an antibacterial agent. Fungal conidia of B. bassiana (1 × 108 per/mL) were inoculated and grown in potato dextrose broth (PDB). For 20 days, the flasks were incubated at 26 ± 2°C.
2.7 Extraction of secondary metabolites from B. bassiana
After 20 days, the entomopathogenic fungi biomass was removed from the broth culture medium using Whatman No. 1 filter paper and washed with distilled water more than five times to remove media particles. Fungal biomass (150 g) was transferred to 1,000 mL glass beakers containing 500 mL of ethyl acetate, which was then mixed with mycelium for 20–25 days at 27 ± 2°C. After the extraction was completed, the liquid portion was separated from the mycelium, and the aqueous phase was filtered using Whatman No. 1 filter paper, following the method described by Balumahendhiran et al. (2019). The secondary metabolites were concentrated in a rotary vacuum evaporator (Superfit-R/150/11, Mumbai, India) at 45–60°C.
2.8 Insect collection and maintenance
An egg mass of T. absoluta was obtained from the local tomato field (12.106527, 78.136139) according to the methods of de Figueiredo et al. (2023). The egg mass was maintained at a temperature of 28 ± 2°C and a relative humidity of 75–86%, with a 14-h light and 10-h dark photoperiod, as described by de Figueiredo et al. (2023) and Eski et al. (2023). Newly emerged larvae were fed young tomato leaves under laboratory conditions.
2.9 Insect larvicidal bioassay
Larval mortality bioassays were conducted following our previous method (Vivekanandhan et al., 2022b). Tomato leaves were immersed in a crude extract derived from B. bassiana at various concentrations of 30, 50, 75, 100, and 150 μg/mL. Next, the 4th instar larvae of T. absoluta were transferred to the bioassay container containing leaves dipped in the fungal crude extract. Each concentration had three replicates, with each replicate containing 25 larvae. As a negative control, 25 larvae were exposed to 0.05% dimethyl sulfoxide (DMSO). The Abbott (1925) was utilized to calculate and adjust larval mortality percentages after 24 and 48 h of exposure. Probit analysis was utilized to calculate the LC50 and LC90 values (IBM Corporation, Bengaluru, Karnataka, India).
2.10 Larval homogenate preparation
The larval tissue was thoroughly homogenized with 2 mL of PBS buffer and then centrifuged at −4°C for 15 min at a speed of 10,000 rpm. After removing any solid or cellular debris waste, the supernatant was poured into a clean centrifuge tube, placed on ice, and used immediately for acetylcholinesterase, α-carboxylesterase, and β-carboxylesterase enzyme assays as described in our previous study (Vivekanandhan et al., 2022a).
2.10.1 Acetylcholinesterase enzyme assay (AChE)
The control and fungal conidia-treated larvae were placed in separate containers and then cleaned with double-distilled water to remove any excess water using tissue paper. Ellman et al. (1961) utilized acetylcholine iodide as a substrate to assess acetylcholinesterase activity in the larval homogenate. In 850 μL of 100 mM sodium phosphate buffer, 50 μL of larval tissues were mixed at pH 7.5. Each reaction mixture contained 50 μL of 10 mM DTNB and 50 μL of 12.5 mM acetylcholine iodide and was incubated at room temperature for 5 min. The sample’s optical density at 405 nm was measured using a Thermo Scientific Multiskan EX (200–240 V) spectrophotometer with an appropriate blank.
2.10.2 Carboxylesterase enzyme assays
The α- and β-carboxylesterase activities were determined in larval homogenate using the method described by Van Asperen (1962). For the tests, 1 mL of sodium phosphate buffer (pH 7.0, 100 mM) with 250 μM of α- and β-naphthyl acetate was mixed with 30 μL of the homogenate. The solution was then incubated for 30 min at room temperature. Next, 400 μL of 0.3% Fast Blue B in 3.3% sodium dodecyl-sulfate (SDS) was added to each reaction mixture to inhibit the enzymatic process. The mixtures were then left at room temperature for 15 min to allow distinct color to develop. The optical density of the sample was measured for α- and β-carboxylesterase using a Thermo Scientific Multiskan EX-200–240V with a suitable reagent blank. The carboxylesterase activity was measured using a standard curve made with naphthol as the reference standard.
2.11 GC-MS analysis
The crude extract of B. bassiana was analyzed using gas chromatography-mass spectrometry on an Agilent 6890. GC equipped with 5,973 N mass-selective detectors and an HP-5 capillary column, according to Camele et al. (2023). Helium was used as the carrier gas at a constant flow rate of 1.0 ml/min. The 0.2 μl sample was injected using a 20:1 split while maintaining temperatures of 230°C and 150°C (Camele et al., 2023).
2.12 Molecular docking analysis
The protein data (CID: 107568) were used to retrieve the crystal structures, which were then assembled using a protein preparation wizard (Navinraj et al., 2023). The chemical structure that had been isolated was verified for accuracy, and hydrogen atoms were added to neutralize the side chains that are not in close proximity to the binding cavity or involved in forming a salt bridge. The site map module, which utilizes novel analytical and search methods to generate binding site information, predicted the active site of the targeted protein (CID: 107568). During the initial search step of site map prediction, grid points were characterized using the method developed by de Sena Filho et al. (2023). The protein has multiple target binding sites on its surface that can bind the ligand to the receptor. The ligand preparation method was used to generate multiple conformations of the input molecule, including different ionization stages, tautomers, stereochemistries, and molecular conformations, in order to filter out molecules based on various criteria. Finally, the ligand was optimized using the Optimized Potentials for Liquid Simulations (OPLS-2005) force field with the default parameters.
2.13 Statistical analysis
The mortality data was analyzed using ANOVA with logarithmic, arcsine, and square root transformations of percentages. The mean of five replications was used to calculate the observed readings. Differences in the data values among the different treatment groups for larvae were evaluated using Tukey’s multiple range test (p < 0.05) with Minitab® 17 software. Sigma Plot-12 (Microcal Software) was utilized to calculate the statistical changes for estimating mid-gut enzyme activity. The lethal dosage (LC50 and LC90) against larvae after 24 and 48 h was estimated using Probit analysis in conjunction with the Minitab®17 software package, with a 95% confidence interval.
3 Results
3.1 Morphology and taxonomy of Beauveria
The morphological features of entomopathogenic fungi (Beauveria species) were characterized. The morphological evaluation results revealed oval-shaped conidia and a white colony during microscopic observations (Figures 1A, B). After cultures of B. bassiana had completed their normal mycelial and spore development, sterile mycelial growth consistently developed on the surface of the potato dextrose agar media. The new growth appeared on the surface of the culture either as a flat and spreading layer or as a loose, cottony efflorescence (see Figures 1A, B). After nine months, B. bassiana, which initially produced white spore masses in culture, yielded sparse masses of pale cream. In this study, it was discovered that mycelium is initially always white. However, as the cultures mature, the color of the mycelium in some of them gradually changes to resemble that of the spores, which typically develop on the surface of the cultures. Table 1 summarizes the morphological characteristics of the listed B. bassiana, including conidial shape and size, non-indigenous cell, and colony.
Figure 1. Seven-day-old culture of B. bassiana on Potato Dextrose Agar media (GenBank: OM346715.1). (A) Fungal culture. (B) Fungal conidia.
Table 1. Morphological and microscopic characteristics of B. bassiana.
3.2 Molecular level confirmation
An 18S rDNA gene universal primer was used to amplify fungal genomic DNA. A gel documentation unit was utilized to examine the amplified DNA fragments to confirm their purity. The amplified DNA fragment size range obtained was 426 base pairs (bp). The quality of the amplified DNA molecule sequences was assessed. The fungal DNA sequence was submitted to the NCBI’s GenBank database. The accession number for Beauveria bassiana is OM346715.1. The BLAST search for the 18S rRNA sequence revealed a perfect match with previously reported B. bassiana cultures. To assess the evolutionary proximity of isolated entomopathogenic fungi, the neighbor-joining tree method was employed (Figure 2).
Figure 2. A phylogenetic tree of the stages of evolution of isolated entomopathogenic fungi has been generated using the neighbor-joining tree method. Our isolated fungal strains were identical to B. bassiana.
3.3 Larvicidal activity
The larval toxicity effects of chemical constituents derived from B. bassiana resulted in high larvicidal activity against T. absoluta larvae 24 h after treatment. It exhibited lower LC50 and LC90 values of 25.937 μg/mL and 33.559 μg/mL, respectively (Figure 3). After 48 h post-treatment, the LC50 and LC90 values were 52.254 μg/mL and 60.450 μg/mL, respectively (see Figure 3). Overall, the results suggested that chemical constituents derived from B. bassiana exhibit remarkable insect larvicidal activity, causing more than 80% mortality at 24 and 48 h post-treatment.
Figure 3. Chemical constituents from B. bassiana were tested for larval toxicity against T. absoluta larvae after 24 and 48 h of treatment.
3.4 Molecular docking studies of 9,10-octadecadienoic acid with target proteins
In the B. bassiana crude extract, 9,10-octadecadienoic acid was identified as a major chemical compound. Therefore, we conducted molecular docking studies with the T. absoluta larval acetylcholinesterase (AChE) protein. The 9,10-octadecadienoic acid molecule (Compound CID: 107568) exhibited a high binding affinity with the acetylcholinesterase (AChE) protein (PDB ID: 1H22). The docking score is −7.5, the cavity volume is 1,062 Å3, the docking size (x, y, z) is 23, and the center (x, y, z) is 1, 62, and 67, as illustrated in Figures 4A–D.
Figure 4. Molecular docking analysis; (A) 9 10-octadecadienoic acid molecules (Compound CID: 107568); (B) acetylcholinesterase (AChE) protein (PDB ID: 1H22); (C,D): 2D and (C,D) Connolly surface views of acetylcholinesterase protein with 9 10-octadecadienoic acid.
3.5 Biochemical analysis
Chemical constituents derived from B. bassiana reduce the levels of the acetylcholinesterase (AChE) enzyme in T. absoluta 4th instar larvae from 11.54 ± 0.3 to 5.41 ± 0.5 M/min/mg larval protein [F(5, 12) = 280.360; p < 0.01] (Figure 5).
Figure 5. Biochemical analysis of B. bassiana-derived chemical constituents on acetylcholinesterase, α-carboxylesterase, and β-carboxylesterase enzymes in the larvae of T. absoluta.
The α-carboxylesterase enzyme levels were similarly reduced [from 7.55 ± 0.5 to 2.33 ± 0.5 M/min/mg larval protein; F(5, 12) = 155.850; P < 0.01] (Figure 5), and the β-carboxylesterase enzymes were significantly reduced compared to the control [from 4.23 ± 0.5 to 1.98 ± 0.5 M/min/mg larval protein; F(5, 12) = 135.263; p < 0.01] (Figure 5).
3.6 GC-MS analysis
GC-MS analysis revealed six major chemical constituents in the crude extracts of the entomopathogenic fungi B. bassiana. The major chemical constituents identified were n-hexadecanoic acid (16.13%), 9,10-octadecadienoic acid (35.47%), 9-eicosyne (13.17%), n-heptacosane (8.36%), tetratetracontane (12.15%), and 7-hexyl eicosane (7.95%) (Table 2). These chemical components may have insect larvicidal activity.
Table 2. Identification of chemical constituents from entomopathogenic fungi B. bassiana derived crude extract using GC-MS analysis.
4 Discussion
Preliminary identified the isolated entomopathogenic fungi as Beauveria species through microscopic observations, such as the presence of white colonies, white pigment production, and oval-shaped conidial structures. We confirmed that the fungal species belong to the Beauveria genus based on the microscopic characteristics and taxonomic key (MacLeod, 1954). Similarly, Wargane et al. (2020) reported morphological characteristics that were consistent with our findings. Similar to the present study, Vivekanandhan et al. (2018, 2020) reported that B. bassiana was isolated from the soil and exhibited morphological features like conidia shapes and pigment production. The size range of the amplified DNA fragments was 426 base pairs (bp). The neighbor-joining tree method showed 100% identity with the previously published B. bassiana when used to determine the evolutionary proximity of isolated entomopathogenic fungi (Figure 2). Similarly, Vivekanandhan et al. (2020) reported that B. bassiana was isolated from the soil and exhibited similar fungal morphological features and conidia shapes as the current findings.
Crude extracts obtained from B. bassiana have been found to be effective against T. absoluta larvae at 24 and 48 h after treatment. The results indicate that crude extracts of B. bassiana significantly affect T. absoluta larvae 48 h after treatment, resulting in more than 80% mortality (Figure 3). Several previous studies have reported that entomopathogenic fungi and their chemical constituents have shown remarkable toxic efficacy against various developmental stages of T. absoluta, including eggs, larvae, pupae, and adults, in both laboratory and field settings (Ndereyimana et al., 2019, 2020; Silva et al., 2020; Hammad et al., 2021; Chouikhi et al., 2022). Similar to the present study, the secondary metabolites from B. bassiana were found to be detrimental to Spodoptera littoralis on second-instar larvae, resulting in an 86% mortality rate (Abdullah and Sukar, 2021). According to Kona et al. (2014), the ethanolic crude extract from Azadirachta indica L. seeds and the petroleum ether crude extract from Jatropha curcas L. seeds were highly effective against T. absoluta larvae, resulting in up to 100% mortality rates observed 4 days after treatment.
Ghanim and Abdel Ghani (2014) reported using five plant crude extracts against second-instar T. absoluta larvae, yielding results similar to those presented in this study. Chinaberry crude extracts had the most significant impact on T. absoluta larvae, followed by geranium, onion, and garlic extracts. Hussein et al. (2015) discovered a significant reduction in the T. absoluta population after tomato plants were treated with garlic extract. Hussein et al. (2015) found that using essential oil to control T. absoluta had a significant impact on fresh weight, shape index, total soluble solids, pericarp thickness, pH, and ascorbic acid levels. Enzymatic analysis revealed that entomopathogenic fungi altered the activity of acetylcholinesterase, α-carboxylesterase, and β-carboxylesterase in T. absoluta fourth instar larvae. Additionally, the chemical constituents of B. bassiana altered the insect immune system, facilitating infection (Figure 5). In comparison to a control, enzyme levels exhibited dose-dependent activity in response to treatment with a fungal crude extract. Following treatment with the crude extract of the fungus, levels of larval acetylcholinesterase, α-carboxylesterase, and β-carboxylesterase enzymes were significantly reduced. According to the findings, the toxicity of B. bassiana crude chemical constituents reduces the levels of acetylcholinesterase, α-carboxylesterase, and β-carboxylesterase enzymes in T. absoluta larvae. The enzymes acetylcholinesterase, α-carboxylesterase, and β-carboxylesterase play a crucial role in combating oxidative stress. Similarly, Vivekanandhan et al. (2022a; 2023) found that M. majus can decrease enzyme levels in Spodoptera frugiperda larvae.
Results of gas chromatography-mass spectrometry (GC-MS) analysis of crude metabolites derived from B. bassiana revealed the presence of six major chemical constituents including n-hexadecanoic acid (16.13%), 9,10-octadecadienoic acid (35.47%), 9-eicosyne (13.17%), n-heptacosane (8.36%), tetratetracontane (12.15%), and 7-hexyl eicosane (7.359%) (Table 2). These major chemical components have insecticidal effects on larvae. Previous studies have demonstrated that chemicals extracted from B. bassiana have notable insecticidal properties (Vivekanandhan et al., 2018). The primary chemical classes of insecticides derived from plants and microbes primarily act on three target sites within the nervous system: acetylcholinesterase, an enzyme involved in nerve impulse transmission, voltage-gated sodium channels across the nerve membrane, and the acetylcholine receptor. The aforementioned chemical constituents could be involved in targeting these three modes of action. Future research is needed to investigate the mode of action of individual insecticidal molecules, as well as to formulate and test their insecticidal action in the field. In the crude extract of B. bassiana, 9,10-octadecadienoic acid was identified as a major chemical compound. Consequently, we conducted molecular docking studies, which revealed a docking score of −7.5, a cavity volume of 1,062 Å3, a docking size of 23 (x, y, z), and a center at 1, 62, and 67 (x, y, z), as depicted in Figures 4C, D. Annapoorani and Manimegalai’s (2013) previous research on insilico molecular docking studies of Calotropis gigantea, an aromatic plant with insect repellent properties targeting the OBP of Culex quinquefasciatus, supports the findings of our current study. Clarified the information and improved the technical accuracy by using appropriate terminology and providing a more coherent and precise description of the research findings.
Similarly, the insecticidal molecule beta-amyrin successfully docked with OBP. In silico molecular docking of insect repellent compounds from Hyptis suaveolens yielded similar results (Gaddaguti et al., 2012). According to other research, sitosterol extracted from H. suaveolens has a higher binding affinity than the main known odorant-binding protein molecules in decanol. As a result, 9,10-octadecadienoic acid exhibited strong binding and interaction with the insect odorant-binding protein and acetylcholinesterase. Carbamate resistance is present in insect populations, and organophosphates are insensitive to acetylcholinesterase (AChE) and odorant-binding proteins (OBPs), which confer resistance (Annapoorani and Manimegalai, 2013).
5 Conclusion
The current research emphasizes the potential of chemical components from the insect-killing fungus B. bassiana as efficient and eco-friendly alternatives to chemical insect pest control. Morphological and genetic analysis confirmed the identification of the insect-killing fungus as B. bassiana. The toxicity of a raw extract from B. bassiana against T. absoluta larvae confirms its ability to control insect pest larvae in crops. Results from molecular docking analysis indicate that the primary molecule (9,10-octadecadienoic acid) from the insect-killing fungus B. bassiana strongly interacts with the acetylcholinesterase (AChE) protein (PDB ID: 1H22) target proteins, making it effective against T. absoluta larvae. These findings open the door for the development of a new larvicidal agent from the insect-killing fungus B. bassiana. Further research is planned to isolate the active molecule from the B. bassiana raw extract, test it under laboratory and field conditions, evaluate its stability, and develop novel insecticides from insect-killing fungi to combat insect pests.
Data availability statement
The datasets presented in this study can be found in online repositories. The names of the repository/repositories and accession number(s) can be found in this article. Further enquiries may be directed to the corresponding author.
Ethics statement
This study presents research on animals that do not require ethical approval for their study.
Author contributions
PV: Conceptualization, Data curation, Investigation, Methodology, Supervision, Formal analysis, Validation, Visualization, Writing—original draft, Writing—review and editing. KS: Conceptualization, Data curation, Methodology, Resources, Formal analysis, Validation, Visualization, Writing—original draft, Writing—review and editing. TA: Formal analysis, Validation, Visualization, Writing—original draft, Writing—review and editing. MA: Formal analysis, Validation, Visualization, Writing—original draft, Writing—review and editing.
Funding
The authors declare financial support was received for the research, authorship, and/or publication of this article. This project was supported by Researchers Supporting Project number (RSP2024R230) King Saud University, Riyadh, Saudi Arabia.
Acknowledgments
The authors would like to express their gratitude to the Department of General Pathology at Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences (SIMATS), located in Chennai-600 077, Tamil Nadu, India. The authors thank the Researchers Supporting Project, King Saud University, Riyadh, Saudi Arabia, for providing financial support.
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher’s note
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Keywords: chemical molecule, acetylcholinesterase, α-carboxylesterase and β-carboxylesterase, larvicide, molecular docking, Beauveria bassiana
Citation: Vivekanandhan P, Swathy K, Alahmadi TA and Ansari MJ (2024) Biocontrol effects of chemical molecules derived from Beauveria bassiana against larvae of Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae). Front. Microbiol. 15:1336334. doi: 10.3389/fmicb.2024.1336334
Received: 10 November 2023; Accepted: 15 January 2024;
Published: 12 February 2024.
Edited by:
Md. Motaher Hossain, Bangabandhu Sheikh Mujibur Rahman Agricultural University, BangladeshReviewed by:
Tariq Mukhtar, Pir Mehr Ali Shah Arid Agriculture University, PakistanWaqas Wakil, University of Agriculture, Faisalabad, Pakistan
Copyright © 2024 Vivekanandhan, Swathy, Alahmadi and Ansari. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Perumal Vivekanandhan, bW9zcXZrQGdtYWlsLmNvbQ==