Abstract
Fusarium wilt is considered one of the most destructive diseases for tomato plants. The novelty of this work was to investigate the antifungal and plant growth-promoting capabilities of some plant growth-promoting fungi (PGPF). Plant growth-promoting fungi (PGPF) improved the plant health and control plant infections. In this study, two fungal strains as PGPF were isolated and identified as Aspergillus fumigatus and Rhizopus oryzae using molecular method. The extracts of A. fumigatus and R. oryzae exhibited promising antifungal activity against F. oxysporum in vitro. Moreover, antagonistic effect of A. fumigatus and R. oryzae against F. oxysporum causing tomato wilt disease was evaluated in vivo. Disease severity and growth markers were recorded and in vitro antagonistic activity assay of the isolated A. fumigatus and R. oryzae against Fusarium oxysporum was measured. Physiological markers of defense in plant as response to stimulate systemic resistance (SR) were recorded. Our results indicated that A. fumigatus and R. oryzae decreased the percentage of disease severity by 12.5 and 37.5%, respectively. In addition, they exhibited relatively high protection percentage of 86.35 and 59.06% respectively. Fusarium wilt was declined the growth parameters, photosynthetic pigments, total soluble carbohydrate, and total soluble protein, whereas content of free proline, total phenols, and the activity of antioxidant enzymes activity increased under infection. Moreover, application of A. fumigatus and R. oryzae on infected plants successfully recovered the loss of morphological traits, photosynthetic pigment total carbohydrates, and total soluble proteins in comparison to infected control plants. PGPF strains in both non-infected and infected plants showed several responses in number and density of peroxidase (POD) and polyphenol oxidase (PPO) isozymes.
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Introduction
Tomato diseases acutely affect its crop and accordingly considered of great economic importance [1]. There are many destructive diseases of both quality and quantity of tomato production [2]. Under the threat of climate changes and the widespread of pathogens, improving crop productivity and avoiding the use of chemical pesticides is a major issue for the agricultural industry [3]. However, Fusarium wilt disease mainly caused by Fusarium oxysporum is affecting severe injury through all phases of plant growth [4]. Lately, in Egypt, the injuries in tomato production due to F. oxysporum infection raised up to 67% of total planted area that makes severe damage during all stages of plant development [5]. The traditional strategies to limit the disease, the use of antifungal compounds, and crop cycle have not been effective due to spores can stay viable for numerous years and the harmful effects of pesticide residues on human health. Thus, it is necessary to improve new and efficient control strategies that do not affect the environmental safety [6].
Biological control is an alternative to chemical control of the Fusarium wilt diseases through antagonist nonpathogenic organisms that have potency to reduce the harmful effects of Fusarium wilt in several crops [7]. Recent studies powerfully favored application of biological agents as safety approaches for human and environment to control F. oxysporum in Egypt [8]. Stimulated resistance is a physiological state of protection potency produced by a specific eco-friendly stimuli that acts essential role against a broad range of plant pathogens including fungi [9]. Plant growing can be simply stimulated by fungi through several mechanisms, such as systemic resistance’s stimulation, plant nutrition enhancements, and via their toxicity to various pathogens [10, 11]. Many plants’ rhizosphere was used for the isolation of several microbial strains have antagonistic activity. Plant growth-promoting fungi can produce chemical compounds with different benefits for the plant. Among them, HCN which was recognized as a bio-control agent, based on its ascribed toxicity against plant pathogens [12, 13]. HCN is a broad-spectrum antifungal compound playing a vital role in the bio-control of fungal disease as has been demonstrated in several studies [12,13,14,15]. Moreover, Ramette and Frapolli [16] proposed that HCN compound works on the cells of the pathogen by obstructive the cytochrome oxidase of the respiratory chain. PGPF produced were able to produce IAA. Also, IAA works a vital role in the improvement of plants by stimulating their growth when applied directly to the roots [82]. PGPF were able to solubilize organic phosphates which play a role in enhancement plant health [17, 18]. Herein, this study aimed to investigate the capabilities of PGPF on the growing of tomato diseased with F. oxysporum in vitro as well as in vivo. Our study opens the approach to an alternative and safety techniques to control the Fusarium wilt disease in tomato. We believe this study poses a great value and importance to integrate Fusarium wilt management.
Materials and Methods
Tomato Plant
Well-identified 4-week-old tomato seedlings (Solanum Lycopersicon L. cv. Castlerock II PVP) were obtained from Agricultural Research Center (ARC), Ministry of Agriculture, Giza, Egypt.
Source and Maintenance of the Fungal Pathogen
F. oxysporum f. sp. Lycopersici RCMB008001 was obtained from Regional Center for Mycology et al.-Azhar University. Then it was confirmed by the pathogenicity test according to Hibar, Edel‐Herman [19]. The inoculum of the pathogen was prepared according to Aldinary and Abdelaziz [20].
Source, Isolation, and Identification of PGPF from Rhizosphere
Rhizosphere was collected from plant field (10 g). Then, 90-ml sterile distilled water was used to make a suspension. Serial dilution technique was performed from 10–2 to 10–6. Aliquots of 0.1 ml were spread on sterile Petri dishes containing sterilized Potato Dextrose Agar (PDA) medium amended with chloramphenicol (200 µg/L) [21, 22]. The Petri dishes were incubated for 3–7 days at 30 °C [19, 23,24,25].
Fungal isolates were identified depending on their morphological characteristics according to recent studies [26,27,28,29,30,31]. Macroscopic morphological features including color, texture, diameter of colonies, and microscopic characteristics including vegetative and reproductive structures of the fungi were noted. Then fungal isolates were identified genetically using ITS gene. The genomic DNA was isolated and purified using Quick-DNA Fungal Microprep Kit (Zymo research; D6007), and molecular identification was achieved by internal transcribed spacer (ITS) region [32,33,34,35,36,37].
In vitro Antagonistic Activity of PGPF Against F. oxysporum
Well diffusion method was applied to study the antifungal activity of ethyl acetate fungal extracts of A. fumigatus and R. oryzae. F. oxysporum was inoculated on PD broth medium, then incubated at 28 ± 2 °C for 3–5 days. Fungal inoculum of F. oxysporum was spread thoroughly on the sterilized solidified potato dextrose agar (PDA) medium. Wells (7 mm) were filled with 50 µl of each fungal extract (4 mg/ml) were put in each well. The culture plates were incubated at 25 °C for 7 days, and the zones of inhibition were observed and measured. Moreover, minimum inhibitory concentration (MIC) was carried, where different concentrations of each fungal extract (4, 2, 1, 0.5 and 0.25 mg/ml) were put in wells to detect MIC.
Pot Experiment: In vivo Study
Applied elicitors (PGPF) were added 1 week before infection with Fusarium oxysporum. The pot trials were conducted at the experimental farm of Botany and Microbiology Department, Faculty of Science, Al-Azhar University. Seedlings were planted in six groups as following:
(1) plants without any treatment were referred to as healthy control, (2) plants infected with Fusarium oxysporum as infected control, (3) healthy plants treated with A. fumigatus strain, (4) infected plants treated with A. fumigatus, (5) healthy plants treated with Rhizopus oryzae, (6) and infected plants treated with Rhizopus oryzae. Disease development and severity were recorded 15 days post inoculation. The plant samples were collected for morphological and biochemical indicators for resistance analysis when the plants were 60 days old.
Disease Symptoms and Disease Index
Disease symptoms and PGPF protection percent were assessed according to Farrag, Attia [8]. The disease symptoms were observed, and disease severity and the protection percentage of PGPF were estimated by the equation: disease index (DI) was calculated using the five-grade scale according to the formula: DI = (1n1 + 2n2 + 3n3 + 4n4)100/4nt and protection % = A–B/A × 100%, where, n1-n4 are the number of plants in scales and net total number of tested plants, A = PDI in infected control plants B = PDI in infected-treated plants.
Metabolic and Biochemical Indicators for Plant Resistance
Quantitative determination of pigments was carried out according to the method used by Vernon and Seely [38], while the well-established method of Lowry, Rosebrough [39], using casein as a standard protein was used to determine the total soluble proteins. In addition, the soluble carbohydrate content of the dried shoot was calculated by the method used by Irigoyen, Einerich [40], while the phenolic compounds were determined according to method used by Diaz and Martin [41]. In addition, free proline content was evaluated [42]. Peroxidase activity was determined according to Srivastava [43]. Also, the adopted method from Matta and Dimond [44] was followed for measuring the activity of polyphenol oxidase.
Statistical Analyses
Analysis of experimental data was achieved by using one-way analysis of variance (ANOVA), while means differences were separated using Duncanʼs multiple range test and the (LSD) at 5.0% level of probability following Costate Software [45, 46].
Results
Isolation and Identification of Fungal Isolates
Two fungal isolates A1 and A5 were isolated from soil sample collected from Tamiya, Fayoum Governorate, Egypt. The two fungal isolates were identified morphologically and genetically. Morphologically, the fungal isolate A1 was identified as Rhizopus oryzae where colonies are fast growing andaare white in color; sporangiophores are brownish and branched; and sporangia are black in color and spherical in shape (Fig. 1A & B). On the other side, fungal isolate A5 was identified as Aspergillus fumigatus where colonies grow rapidly reaching 3.0–5.0 cm diameter in 4 days at 28 °C on PDA medium, showing rapid rate of growth with smoky grayish green in color, oval vesicle, bearing single series of sterigmata covered mostly half of the vesicle, conidial head is a columnar, dome shape (Fig. 2C & D). Molecular identification using ITS gene confirmed that A1 and A5 is resemble to Rhizopus oryzae and A. fumigatus with similarity 99%, respectively. The sequences of the two strains Rhizopus oryzae and A. fumigatus were recorded in GenBank with accession numbers OK036955 and OK041517, respectively. (Fig. 2).
In vitro Antifungal Activity of PGPF Strains Against F. oxysporum
Antifungal activity of fungal extracts of R. oryzae and A. fumigatus was evaluated against F. oxysporum using agar well diffusion method as shown in Figure 3. Results revealed that the two fungal extracts exhibited a promising antifungal activity against F. oxysporum, where inhibition zones of A. fumigatus and R. oryzae at concentration 4 mg/ml were 18 and 19 mm, respectively (Figure 3A). Moreover, different concentrations (4.0 – 0.25 mg/ml) of the two extracts were evaluated to detect MIC for each extract as shown in Figure 3B. Results illustrated that MIC of R. oryzae extract was 0.5 mg/ml, while MIC of A. fumigatus extract was 1 mg/ml.
Parameters Evaluation and Estimation of Systemic Resistance Induced by PGPR Against F. oxysporum Caused Tomato Wilt Disease
Disease Severity (DS) and Protection Percent
Results in Table 1 indicated that A. fumigatus and R. oryzae were reducing the percentage of disease severity by 12.5 and 37.5%, respectively. In addition, they exhibited high protection percentage of 86.35 and 59.06%, respectively with regard to control.
Growth Indicators
It is clear from data in Table 2 and Fig. 4, various growth parameters (shoot length, root length, and number of leaves) were significantly improved by application of A. fumigatus and R. oryzae. Tomato plants infected with F. oxysporum showed significant loss of shoot length, root length, and the number of leaves. Moreover, the loss of shoot length (48.23%), root length (51.16%), and number of leaves (78.07%) in comparison to healthy control plants. On the other hand, the application of A. fumigatus and R. oryzae on infected plants successfully recovered the loss of shoot length, root length, and number of leaves in comparison to infected control plants.
Photosynthetic Pigments
As shown in Table 3, chlorophyll a and b contents were significantly decreased in the infected plants. On the other hand, infected plant treated with tested elicitors (A. fumigatus and R. oryzae) showed a significant enhance in the content of chlorophyll a, b compared to the infected control. Also, the treatment with A. fumigatus exhibited the most potent effect in terms of the chlorophyll a and b contents than plants treated with R. oryzae, compared to the non-treated infested control. However, when healthy plants treated with tested elicitors A. fumigatus and R. Oryzae, a promising recovery response in comparison to healthy control plants was observed. Additionally, the contents of carotenoids were significantly increased in tomato plant in response to F. oxysporum infection. In Fusarium-infected plant and treated with A. fumigatus and R. Oryzae, the contents of carotenoids were markedly increased compared to the non-treated infested control.
Physiological and Metabolic Changes
Results reveled that total soluble proteins and total carbohydrate of tomato decreased significantly in response to the infection with F. oxysporum (Fig. 5). On the other hand, A. fumigatus or R. oryzae led to significant increase in the contents of total soluble proteins of infected plants. However, pre-treatment with R. oryzae resulted in significant effect in terms of the total soluble protein and total carbohydrate contents more than A. fumigatus and the non-treated-infected plants. The total phenols and free proline of tomato increased significantly in response to F. oxysporum infection (Table 4). It is noticeable that the greatest value recorded for the total phenols and free Proline was achieved by applied R. oryzae followed by A. fumigatus. Moreover, Results in Fig. 6 revealed that the changes in the activities of oxidative enzymes (Peroxidase; POD and Polyphenol Oxidase; PPO) in infected plants were significantly increased with respect to the non-infected plants (control). Additionally, the most significant increase in POD activity was achieved by utilizing Rhizopus oryzae on the infected plants followed by A. fumigatus. While, the most significant increase in PPO activity was achieved by using A. fumigatus on the infected plants followed by Rhizopus oryzae compared to infected tomato plants.
Isozymes
POD Isozymes
Native PAGE in Fig. 7 and Table 5 showed seven POD isozymes at Rf (0.484, 0.607, 0.806, 0.855 and 0.934). Fusarium -infected plants showed highly over expressed POD that recorded 5 bands including 3 faint bands at Rf (0.484, 0.607and 0.934), 1 moderate bands at Rf (0.806) and 1 highly dense band at Rf (0.855). Application A. fumigatus or R. oryzae on infected plants recorded the same 5 bands at the same Rf in which 3 of them were faint bands at Rf (0.484, 0.607and 0.934), while the other 2 bands were moderate t at Rf (0.806, 0.855). Healthy plants treated with A. fumigatus or R. oryzae expressed the lowest POD expression that they produced 2 faint bands at Rf (0.484 and 0.607) and 1 moderate band at (0.806).
PPO Isozymes
The PPO isozyme of plant leaves showed three PPO isozymes at Rf (0.204, 0.629 and 0.786) in Fig. 8 and Table 6. Fusarium -infected plants showed the highly PPO expression that produced 3 bands including 2 moderate bands at Rf (0.204 and 0.786), 1 highly dense band at Rf (0.629). Under fusarium infection conditions, treatment with A. fumigatus recorded 3 faints bands at Rf (0.204, 0.629 and 0.786) and 1 moderate band at Rf (0.786), while Rhizopus oryzae treatment gave a high expression of PPO resulted in 1 moderate bands at Rf (0.204), 1 faint bands at Rf (0.786), and 1 highly dense band at Rf (0.629).
Discussion
It is well recognized that defiance to pathogens can be improved within plants through exogenous use of biotic or abiotic agents. Non-pathogenic rhizo-fungi and their metabolites are considered one of the most important biotic elicitors [47, 48]. The application of PGPF resulted to induct plant growth as well as induced systemic resistance responses to biotic stresses [49]. Application of natural agents for controlling of fungal phytopathogens as safe agents for soil micro flora living organisms and the environment instead of chemical fungicides. For this reason, in this study, two fungal strains A. fumigatus and R. oryzae as PGPF which could be used to generate plant defiance against Fusarium wilt. In accordance with our results, previous studies reported that Aspergillus species can be used for growth promotion and control of fungal plant diseases [50,51,52,53,54]. Hung and Lee Rutgers [50] illustrated that Aspergillus spp. induce the plant growth through the production of active compounds. Another study, Aspergillus isolated from rhizosphere of wheat produced multiple plant growth inducers as IAA, GA, and siderophores, that resulted in phosphate solubilization, enhancement seed germination percent, and plant height [51]. Furthermore, R. arrhizus KB-2 was used as plant growth promoter through production of gibberellin, indole acetic acid, and abscisic acid [55]. The first indicator to systemic resistance incidence in plants was the treatment with PGPF which minimized the DS % as well as established the protection against F. oxysporum. According to the presented data, the treatment with A. fumigatus strain was the best treatment in terms of reducing the PDS and recorded the highest protection. These explained by Jovičić-Petrović and Jeremić [56] which reported that Aspergillus established inhibition percentage against F. oxysporum by (33%). Also Kriaa and Hammami [57] recorded Aspergillus has antifungal activity against Fusarium; thus it applied as a new bio fungicide. Also, Peeran and Prasad [58] proved the efficient antifungal activity of R. oryzae against plant pathogens. Furthermore, Kang and Hong [59] studied the antifungal activity of Aspergillus against Phytophthora phytopathogens. Also, [20] reported that Aspergillus is applied as effective biological control agents againsttF. oxysporum. For more Espinoza, González [60] reported that Rhizopus has fungicidal activity like that of fungicide Captan against wide range of plant pathogens. Aspergilli species are able to produce a great number of bioactive secondary metabolites as bioactive proteins, enzymes that may be resulted in plant recovery from harmful effect of Fusarium infection [61]. Rhizopus oryzae the has ability to produce the supportable platform chemicals lactic acid, fumaric acid, and ethanol that may be promoting the plant growth and enhancement the soil properties [62].
Many microbial functions of Aspergillus has been reported, through stimulation of ionic transport to enhancement vegetative growth and production of aminocephalosporanic acid acylase enzymes [63]. In this study, the tomato growth parameters (shoot length, root length, number of leaves per plants, chlorophyll and carbohydrates) were significantly decreased due to Fusarium infection. In this respect, this decreasing may be associated with the disorders in the distribution of the growth regulating hormones [4, 64,65,66,67,68]. Our results proved that, the treatment of infected tomato plant with A. fumigatus and R. oryzae led to significantly improve the plant growth characters compared to control plants. Our results are in harmony with those informed by Alwathnani, Perveen [69]. Moreover, these improved all growth parameters compared with control. These results explained by production of secondary metabolites that induce the growth of plants under stress conditions [70].
Photosynthesis is the main purpose of plants, empowering them to convert light energy into chemical energy which next utilized in all cell activities and it is highly altered by pathogenic infection [71, 72]. In the current study, F. oxysporum caused a significant decreasing in both photosynthesis, resulting in inhibition of growth. The decline in chlorophyll was well described by Kyseláková and Prokopová [73] which reported that infection may be resulted to the oxidative stress that caused damage chlorophyll a; this means that the plant fail in bagging sunlight and thus photosynthesis will be reduced or inhibited. Pigment contents were positively affected due to treatment with A. fumigatus and R. Oryzae; this result became one of the visible pieces of evidence of treatment efficiency. Our study revealed that treatments with A. fumigatus and R. oryzae showed significant increase in the pigment contents compared with control. Our results are harmony with those reported in the literature [65, 66, 74]. The positive effect in photosynthetic pigments due to treatment of A. fumigatus and R. oryzae may be attributed to enriching the plant and its soil with N2 element. Our results agreed with Farrag and Attia [8]; they reported that the totalssoluble protein increased significantly due to Fusarium infection. These results explained by Nafie [75] who recorded that F. oxysporum infection induced the plant to form of nitrogenous constituents. The indirect effects of PGPF strains in the disease suppression include the activation of the plant defense mechanisms through the production of proteins when tested with pathogens [76]. For more soluble sugars involved in the responses to a number of stresses may be resulted in modifications of gene expression [77]. Total phenols act as scavengers agents for free radical and substrate for many antioxidant enzymes [78]. Our results showed that total phenol of infected tomato seedlings was significantly increased. However, the application of A. fumigatus and R. oryzae resulted in different responses in both total phenols and free proline of plants. On the other hand, high values of total phenols and free proline were achieved. Total phenols play a vital key in plant metabolic regulation, plant growth, and the lignin production [79]. Our results showed that proline contents significantly increased in plants treated with A. fumigatus and R. oryzae. These results are in agreement with Gupta [80] and Al-Wakeel, Moubasher [81]; they reported that the proline contents significantly increased during the fungal pathogenesis.
The highest increase in POD and PPO activities were determined due to the treatment with A. fumigatus and R. oryzae. This enhancement of PPO activities against disease have been recorded [82]. Protein profile showed seven POD isozymes and four PPO isozymes sign the extract of leaf-soluble proteins. Many new isozyme bands were induced by Fusarium infection thus the antioxidant enzyme activities in Fusarium -infected plants treated with A. fumigatus and R. oryzae were better than those in control plants. These results explained the major role of our fungal strains (A. fumigatus and R. oryzae) as a plant growth promotors and isolates in protecting tomato plants against Fusarium wilt disease.
Conclusion
The present investigation conducted a new method focused on application of plant growth promoting fungi in the induction of the systemic resistance against fungal plants diseases. The isolated PGPF were conducted to the molecular characterization and identified as A. fumigatus and R. oryzae. In vitro, both A. fumigatus and R. oryzae exhibited potential antifungal activity F. oxysporum causing Fusarium wilt disease. In vivo, application of A. fumigatus and R. oryzae for 1 week before Fusarium infection showed positive effect in plant growth parameters including plant height, increase in the content of chlorophyll a and b and carotenoids, free proline, the total protein, total sugars, phenols, and POD and PPO activities compared to control. Accordingly, PGPF are promising agents for applications in food processing and packaging, agricultural application, and as effective biological control against F. oxysporum that cause tomato wilt disease.
Data Availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
Code Availability
Not applicable.
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Acknowledgements
The authors would like to express their sincere gratitude to the research colleagues in Faculty of Science, Al-Azhar University, Egypt, for their support to this research work.
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Mohamed S. Attia: Conceptualization, methodology, formal analysis and investigation, writing—original draft preparation, writing—review and editing the manuscript, resources, software; Deiaa A. El-Wakil: Methodology, writing—original draft preparation, writing—review and editing, resources, software; Amr H. Hashem: Conceptualization, methodology, formal analysis and investigation, writing—original draft preparation, writing—review and editing, resources, software; Amer M. Abdelaziz: Conceptualization, methodology, formal analysis and investigation, writing—original draft preparation, writing—review and editing, resources, software.
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Attia, M.S., El-Wakil, D.A., Hashem, A.H. et al. Antagonistic Effect of Plant Growth-Promoting Fungi Against Fusarium Wilt Disease in Tomato: In vitro and In vivo Study. Appl Biochem Biotechnol 194, 5100–5118 (2022). https://doi.org/10.1007/s12010-022-03975-9
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DOI: https://doi.org/10.1007/s12010-022-03975-9