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Tomah, A.A.; Zhang, Z.; Alamer, I.S.A.; Khattak, A.A.; Ahmed, T.; Hu, M.; Wang, D.; Xu, L.; Li, B.; Wang, Y. Trichogenic Nanoparticles of Trichoderma. Encyclopedia. Available online: https://encyclopedia.pub/entry/49039 (accessed on 21 December 2024).
Tomah AA, Zhang Z, Alamer ISA, Khattak AA, Ahmed T, Hu M, et al. Trichogenic Nanoparticles of Trichoderma. Encyclopedia. Available at: https://encyclopedia.pub/entry/49039. Accessed December 21, 2024.
Tomah, Ali Athafah, Zheng Zhang, Iman Sabah Abd Alamer, Arif Ali Khattak, Temoor Ahmed, Minjun Hu, Daoze Wang, Lihui Xu, Bin Li, Yanli Wang. "Trichogenic Nanoparticles of Trichoderma" Encyclopedia, https://encyclopedia.pub/entry/49039 (accessed December 21, 2024).
Tomah, A.A., Zhang, Z., Alamer, I.S.A., Khattak, A.A., Ahmed, T., Hu, M., Wang, D., Xu, L., Li, B., & Wang, Y. (2023, September 11). Trichogenic Nanoparticles of Trichoderma. In Encyclopedia. https://encyclopedia.pub/entry/49039
Tomah, Ali Athafah, et al. "Trichogenic Nanoparticles of Trichoderma." Encyclopedia. Web. 11 September, 2023.
Trichogenic Nanoparticles of Trichoderma
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This entry is adapted from the peer-reviewed paper 10.3390/nano13172475

Trichoderma is the asexual stage of the filamentous Hypocrea genus belonging to the Ascomycota fungi division. The species of this genus are free-living saprophytic fungi found in all soils, with an average presence in temperate and tropical soils of nearly 101-103 culturable propagules per gram.

Trichoderma spp. cell-free culture filtrate mycosynthesis nanoparticles

1. Introduction (General Properties of Trichoderma)

Although the genus Trichoderma was first discovered by Persoon in 1794, it was not until Weindling published his first full paper on Trichoderma lignorum in 1934 that its role as a biological control agent was realized. Weindling’s paper showed that this species can control plant diseases, and this discovery led to a renewed interest in Trichoderma as a potential biocontrol agent [1]. Trichoderma is the asexual stage of the filamentous Hypocrea genus belonging to the Ascomycota fungi division. The species of this genus are free-living saprophytic fungi found in all soils, with an average presence in temperate and tropical soils of nearly 101-103 culturable propagules per gram [2][3]. These fungi reproduce asexually by the production of conidia and chlamydospores and in wild habitats by ascospores [4]. The genus Trichoderma is one of the most frequently isolated soil microorganisms. It has several useful properties, including being non-pathogenic to humans and plants, environmentally friendly, easy to isolate and culture, capable of rapid growth on a variety of inexpensive organic substrates, and able to produce a wide range of proteins, enzymes, and secondary metabolites [5][6][7]. The species of this genus are genetically quite diverse, with differences in capabilities among strains. These fungi have been widely used as biocontrol agents. Some Trichoderma spp. are known to control plant diseases through a variety of mechanisms, either indirectly (by competing for nutrients and space, modifying the environmental conditions, or promoting plant growth and plant defense mechanisms and antibiosis) or directly (by mechanisms such as mycoparasitism or the synergistic action of several mechanisms) [8]. Trichoderma spp. produce a variety of antibiotics and secondary metabolites that play an important role in inhibiting pathogens. The antibiotic’s mechanism is via low-molecular-weight diffusible organic compounds excreted by Trichoderma that inhibit the growth of the pathogen. The bioactive compounds secreted by Trichoderma are natural compounds that are chemically different, non-polar, and low molecular mass (less than 3000 Daltons) [9][10] and include polyketides, alkaloids, terpenoids, non-ribosomally biosynthesized peptides (NRPs), and metabolites of mixed biogenesis [10][11]. The compounds, which are typically composed of 5–20 amino acid residues, have a high content of α-aminoisobutyric acid (Aib) with an acylated N-terminus and a complex C-terminus that may consist of a free or methoxy-substituted 2-amino alcohol, amine, amide, free amino acid or sugar alcohol [12][13].
The antibiotic production of over 180 secondary metabolites, representing different classes of chemical compounds exhibiting biocontrol activity, has been reported for isolates of Trichoderma [10][14]. For example, gliovirin is produced from Gliocladium virens and has antimicrobial active against of Pythium ultimum [15], while gliotoxin from T. virens [16] inhibits the mycelium of both P. ultimum and Rhizoctonia solani [17]. Some species produce types of peptaibols (linear peptides), such as trichokonin VI from T. pseudokoningii SMF2, which has a wide antimicrobial spectrum against several bacteria, yeasts, and filamentous fungi [18], and trichorzianine from T. harzianum, which exhibits antibacterial activity against S. aureus [19], while koninginin A and B (polyketides group) are secreted by T. koningii [20][21]. Pyrone 6-PP was first discovered in a culture broth of T. viride [22] and is classified as a volatile organic compound. The 6-PP compound displayed good antifungal activity against Aspergillus flavus, Penicillium expansum, and Fusarium acuminatum [23]. Other antifungal compounds isolated from Trichoderma spp., belonging to different chemical classes, have been used in plant protection as an environmentally friendly and efficient management tool against a variety of phytopathogens.
These metabolites can be either overproduced or combined with other metals to create new formulations that are more efficient for use in several fields, including in the control of plant diseases. Biomolecules can bind to metals through their proteins and amino acid residues, forming a coating on the surface of the NPs. This coating, known as capping, can increase the stability of the NPs and prevent them from aggregating [24][25]. Subsequent stabilization can also be provided by free amino groups or cysteine residues or through the electrostatic attraction resulting from negative carboxyl groups provided by mycelial cell wall enzymes present in the filtrate. Furthermore, the ability of the thiol (-SH) group to form disulfides—perhaps the most important bridging structure in nature—with cysteine subunits of endogenous proteins renders them unique among the functional groups utilized in nanotechnology to form thiolated disulfide bonds that tightly bind with noble metals, leading to the formation of stable NPs [24][26][27]. For example, FTIR analysis confirmed that a gliotoxin bioactive compound secreted by T. virens is responsible for capping and reducing Ag+ and the biosynthesis of silver NPs through binding of each of the negative carboxyl groups, sulfur, and oxygen from the hydroxyl groups of gliotoxin with silver [28].

2. Trichogenic Nanoparticles

The term “mycosynthesis” was first used to describe the synthesis of NPs using the fungus F. acuminatum by Ingle et al. [29]. Since then, the term “Myconanotechnology” has expanded to include literature studies that describe NPs synthesized using fungi [30]. The term “Trichogenic” has recently been used to describe the biogenic synthesis of selenium NPs using six species of Trichoderma [31].
Among the most important fungi that are used in biological control against phytopathogens, the Trichoderma species have the potential to be used to synthesize NPs on a large scale by using an environmentally friendly production process. According to the inventory list conducted by Cai and Druzhinina [32], there are around 460 species with valid names in the Trichoderma genus that have been deposited in public updated databases available on the International Subcommission on Taxonomy of Trichoderma website (www.trichoderma.info, accessed on 25 February 2022). However, and from a thorough inventory of literature studies, researchers found that only about 13 species belonging to the Trichoderma genus show the ability for NP synthesis, including T. harzianum, T. asperellum, T. viride, T. atroviride, T. virens, T. longibrachiatum, T. pseudokoningii, T. reesei, T. koningii, T. brevicompactum, T. citrinoviride, T. hamatum, and T. gamsii. These species are known to be applied globally as biological control agents against different plant pathogens. Although the number of Trichoderma species has been increasing, research on the synthesis of NPs using this genus is still in its early stages. More research is needed to explore the potential of Trichoderma species for nanoparticle synthesis.
The first report on the use of Trichoderma in the synthesis of silver NPs by Mukherjee [33] dates back to 2008. This strategy has attracted much more attention in the most recent decade as the synthesis mechanism for various NPs using diverse metals such as silver (Ag), gold (Au), copper (Cu), zinc (Zn), and so on. NPs of both silver and gold are considered more secure in contrast to other metallic NPs [34]. Through a survey of the literature published from the years 2008 to 2021, more than 100 research papers published in the approved journals adopted the use of Trichoderma in the synthesis of NPs from different metals. Using the percentage equation [(M/N) × 100)], where M means the number of studies that used Trichoderma in the synthesis of NPs from a specific metal and N means the number of research studies that used Trichoderma in the synthesis of NPs from different minerals, the proportional analysis shows that silver metal occupied the leading position in the synthesis of NPs by the Trichoderma species, which was 54% of the total of other metals (Figure 1A). On the other hand, most of the Trichoderma spp. applied in biological control were suggested to have the capacity to biosynthesize NPs. Five different species of Trichoderma, viz., T. asperellum, T. harzianum, T. longibrachiatum, T. pseudokoningii, and T. virens, led in the production of silver NPs (AgNPs) [35]. Spherical AgNPs with sizes from 2 to 15 nm were formed using cell filtrates of T. inhamatum [36]. Production of silver NPs was achieved through extracellular reduction by six isolates of T. virens, and a single and aggregated form was obtained, which was uniform in shape and had a size of 8–60 nm [37]. Meanwhile, six species belonging to the Trichoderma genus, viz., T. asperellum, T. harzianum, T. atroviride, T. virens, T. longibrachiatum, and T. brevicompactum, were successful in the biogenic synthesis of selenium NPs (SeNPs) [31].
Nanomaterials 13 02475 g001
Figure 1. The percentage of metals used in the synthesis of NPs by Trichoderma species (A). Percentage of Trichoderma species used in the synthesis of NPs (B).
Also, using the extracellular filtrate of T. viride to yield of AuNPs, a mixture of spheres, triangles, hexagons, and rod shapes with sizes 20–30 nm were obtained, with a few as big as 120 nm [38]. Meanwhile, the AuNPs obtained using the T. asperellum biomass were well dispersed, with diverse shapes such as spheres, triangles, and hexagons [39].
A T. hamatum cell-free filtrate is used for the synthesis of AuNPs of dimensions 5–30 nm and with diverse shapes such as spheres, pentagons, and hexagons [40]. Additionally, magnesium oxide (MgO) NPs at a size ranging from 45.12 to 95.37 nm were obtained using the extracellular approach of T. viride [41], zinc oxide (ZnO) NPs with a mean size of 30.34 nm were biosynthesized using the fungal mycelial water extract derived from T. harzianum [42], copper oxide (CuO) NPs with crystalline and spherical-shaped particles with an average size of 110 nm were produced using a cell-free extract of T. asperellum [43], and the biosynthesis of cadmium sulfide (CdS) NPs with a size range of 3–8 nm and a spherical morphology has been already reported using the fungal biomass of T. harzianum [44]. Titanium oxide (TiO2) NPs of highly irregular size (10–400 nm) and triangular, pentagonal, spherical, and rod-like shapes were synthesized using TiO2 with the extract of T. citrinoviride as a reducing agent [45]. A literature survey of research papers published from 2008 to 2021 in approved journals revealed that more than 100 studies had adopted the use of Trichoderma in the synthesis of NPs. Using the percentage equation [(T/N) × 100)], where T means the number of studies that used one species of Trichoderma in the synthesis of NPs, while N means the number of research that used all different types of Trichoderma in the synthesis of NPs, the proportional analysis shows the potential of most Trichoderma species in the biosynthesis of NPs by the reduction of a wide range of diverse metals (Figure 1B).
Among the interesting metals, selenium (Se), and its applications in biomedicine, agriculture, and environmental health, has become of great research interest in recent decades. Trichoderma has been used in the formation of nanoproducts by selenium metal due to its ability to reduce selenite and convert it into less toxic derivatives [46].
Selenium (Se) NPs are gaining importance in the field of medicine owing to their antibacterial and anticancer properties [47]. SeNPs at a size of 20–220 nm and spherical and pseudo-spherical Se particles were synthesized by the SeO2 reduction process in the Trichoderma spp. WL-Go culture broth and the pure product were obtained and characterized through filtration of the culture broth supernatant [48]. SeNPs, as plant biostimulants, were obtained using the filtrate of Trichoderma strains to mediate the reduction of selenium (Se) ions, and their effects on different stages of Vigna radiata plant growth were observed. Besides the growth improvement and protection of the plants from phytopathogens, SeNPs were found to be much less toxic than Se selenite in the tested seeds [49]. Inoculated plants with biosynthesized SeNPs from T. atroviride exhibited a significant level of protection of 72.9% against late blight of tomato caused by P. infestans, where the defense responses noted included an accumulation of lignin, callose, and hydrogen peroxide that supported the cellular defense mechanism, while the biochemical defense mechanism collaborated by elevating the levels of lipoxygenase (LOX), phenylalanine lyase (PAL), β-1,3-glucanase (GLU), superoxide dismutase (SOD) in plants [50]. The selenium (Se) NPs synthesized using the Trichoderma sp. fungus culture filtrate showed great effectiveness as a larvicidal and antifeedant agent at a concentration of 100 µg/mL for 48 h, and they can be used for the control of Spodoptera litura larvae that infect peanut and castor plants [51]. Acknowledging these Se advantages, the synthesis of SeNPs via Trichoderma is preferred as it offers a safer, more eco-friendly, and less toxic alternative compared with other metals. Additionally, biologically synthesized SeNPs tend to be more stable as they have a natural coating of organic material on their surface, which will prevent the aggregation of the NPs over a long period of time [51].

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Subjects: Biology
Contributors MDPI registered users' name will be linked to their SciProfiles pages. To register with us, please refer to https://encyclopedia.pub/register :
Ali Athafah Tomah
,
Zheng Zhang
,
Iman Sabah Abd Alamer
,
Arif Ali Khattak
,
Temoor Ahmed
,
Minjun Hu
,
Daoze Wang
,
Lihui Xu
,
Bin Li
,
Yanli Wang
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Update Date: 13 Sep 2023
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