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Revista mexicana de ciencias agrícolas

versão impressa ISSN 2007-0934

Rev. Mex. Cienc. Agríc vol.10 spe 22 Texcoco Mar./Abr. 2019

https://doi.org/10.29312/remexca.v0i22.1866 

Articles

Analysis of research on Metarhizium anisopliae in the last 40 years

Francisco Hernández-Rosas1 

Luis Andrés García-Pacheco1 

Katia Angélica Figueroa-Rodríguez1  § 

Benjamín Figueroa-Sandoval2 

Josafhat Salinas Ruiz1 

Dora Ma. Sangerman-Jarquín3 

Edna Liliana Díaz-Sánchez1 

1Colegio de Postgraduados-Campus Córdoba. Programa de Innovación Agroalimentaria Sustentable. Carretera Córdoba-Veracruz km 348, Congregación Manuel León, Amatlán de los Reyes, Veracruz, México. CP. 94953. (fhrosas@colpos.mx; garcia.andres@colpos.mx; diaz.edna@colpos.mx; salinas@colpos.mx).

2Programa de Innovación en el Manejo de Recursos Naturales-Colegio de Postgraduados-Campus San Luis. Calle de Iturbide 73, Salinas de Hidalgo, SLP. CP. 78622. (benjamin@colpos.mx).

3Campo Experimental Valle de México-INIFAP. Carretera Los Reyes-Texcoco km 13.5, Coatlinchán, Texcoco, Estado de México, México. CP. 56250. (sangerman.dora@inifap.gob.mx).


Abstract

Biological control is used for the regulation of pest insect populations and to avoid the induction of insect resistance due to the excessive use of agrochemicals, as well as to solve waste problems for the organic production of food. There are more than 750 species of entomopathogenic fungi that can be used for the biological control of pests, being Metarhizium anisopliae, one of the most used commercially. The objective of this review was to determine the most relevant issues regarding research concerning M. anisopliae during the period from 1976 to 2018. A revision was made in the meta search Scopus®, using as keyword Metarhizium anisopliae only in title for October 9, 2018. The main journals, countries and institutions that have published on the subject were identified. The data was analyzed using VOSviewer® software under the principle of co-occurrence of terms. The results show that this microorganism has been widely studied at an international level, especially in the period from 2008 to 2014. The investigations are concentrated in three clusters: production-activity, Beauveria bassiana and termites. It is concluded that this microorganism continues to be analyzed from a commercial perspective and because biological control agents tend to be local, their investigations will continue to concentrate on the development and characterization at the molecular level of local (native) strains with commercial potential.

Keywords: Beauveria bassiana; biological control; entomopathogens; pests; termites

Resumen

El control biológico se utiliza para la regulación de poblaciones de insectos plaga y evitar la inducción de resistencia de los insectos por el uso excesivo de agroquímicos, así como solventar problemas de residuos para la producción orgánica de alimentos. Existen más de 750 especies de hongos entomopatógenos que pueden utilizarse para el control biológico de plagas, siendo Metarhizium anisopliae, uno de los más utilizados a nivel comercial. La presente revisión tuvo por objetivo determinar los temas más relevantes con respecto a investigaciones concernientes a M. anisopliae durante el período de 1976 a 2018. Se realizó una revisión en el metabuscador Scopus®, utilizando como palabra clave Metarhizium anisopliae solo en título para octubre 9, 2018. Se identificaron las principales revistas, países e instituciones que han publicado sobre el tema. Los datos se analizaron utilizando el software VOSviewer® bajo el principio de co-ocurrencia de términos. Los resultados muestran que este microorganismo ha sido ampliamente estudiado a nivel internacional, especialmente en el período de 2008 a 2014. Las investigaciones se concentran en tres clústeres: producción-actividad, Beauveria bassiana y termitas. Se concluye que este microorganismo sigue analizándose desde una perspectiva comercial y debido a que los agentes de control biológico tienden a ser locales, sus investigaciones continuarán para concentrarse en el desarrollo y caracterización a nivel molecular de cepas locales (nativas) con potencial comercial.

Palabras clave: Beauveria bassiana; control biológico; entomopatógenos; plagas; termitas

Introduction

The excessive use of chemical products in agricultural crops is a problem, since some insects have developed resistance to them (Lezama-Gutiérrez et al., 2012). Therefore, it has become necessary to look for alternative means for the biological control of pests in order to minimize the use of these chemicals (Mirhaghparast et al., 2013). Biological control provides additional tools for the management of pests that break the resistance cycles of insects, as well as solve waste problems for the production of organic food (Fravel, 2005). There are more than 750 species of entomopathogenic fungi disseminated in the environment that cause fungal infections to certain insects, which can regulate up to 80% of their populations (Lobo et al., 2016). Among the most important genera are: Metarhizium, Beauveria, Aschersonia, Entomophthora, Zoophathora, Hirsutella, Fusarium and Verticillium (Acuña-Jiménez et al., 2015).

In this context Metarhizium anisopliae is a filamentous fungus characterized and used for the control of pests, in addition the use of its enzymes is used as a biological catalyst in the industrial sector (Alonso-Díaz et al., 2007). It is one of the most common species that has been found, studied and used throughout the world mainly as a biological control agent (ACB) (Curran et al., 1994). This fungus has been successfully applied since the 1970s in Brazil to control pests in sugarcane (Rangel et al., 2006). M. anisopliae has also been used as a biological control agent or ACB for pests of various insects: termites (Isoptera), lobsters (Locusta migratoria L.), spittlebugs (Aeneolamia spp., Prosapia spp., Nilaparvata lugens Stål), beetles (Adoryphorus couloni B., Antitrogus parvulus Britton, Aphodius tasmaniae Hope, Oryctes rhinocerus L.), screwworm (Diatraea saccharalis F.) and for the control of mosquito vectors of malaria, including their larval stages (Buti et al., 1994).

Research on the use of microorganisms for the biological control of pests in agriculture, is present in the scientific literature since the seventies, being a subject widely explored from various lines of knowledge (Camargo et al., 2016); however, to date there is no holistic review to understand what research has focused on this fungus. The objective of this review was to determine the most relevant issues regarding research concerning M. anisopliae during the period from 1976 to 2018.

Materials and methods

The analyzed publications were obtained with the search engine Scopus® Elsevier (http://www.scopus.com) for the period from 1976 to 2018 (October 9). Initially the word Metarhizium was used, only in the title, which generated 1 708 documents. Publications were found regarding several species of the genus Metarhizium such as: M. anisopliae (1 272 publications), M. acridum (107), M. robertsii (173), M. brunneum (121), M. rileyi (16), M. majus (7), M. guizhouhense (6), M. pingshaense (6), the species M. anisopliae was the most studied, by which only the publications of M. anisopliae were retained or used for the analysis. Of the total of documents analyzed, 1 216 were articles, occupying 95.6% of the total. Other documents were: book chapters (7), reviews (14), articles in the press (4), conference documents (14), letters (2), notes (3), surveys (3) and erratum (9). With these data a bibliometric analysis was elaborated using the terms of the keywords, titles and summaries of the publications to show only the elements connected to each other.

Analysis of the results

VOSviewer® software (Center for Science and Technology Studies, 2018) was used for the analysis. An analysis of co-occurrence of key words and academic terms in the titles and abstracts of the publications was made, the method was normalization-force of association (FA), resolution of 1.00, scale of visualization to 100%, weight TLS, tag variation size of 50% and core width of 30%. The complete counting method was established, with a number of records of each term ≥10, and a minimum cluster size of 15 (van Eck and Waltman, 2010). With the terms retained the map was created for the visualization of the network, those terms with more frequency are presented in larger bubbles, the irrelevant terms were eliminated (Heersmink et al., 2011).

Results

The number of publications dealing with aspects related to M. anisopliae is abundant, then the bibliometric indicators related to this microorganism are analyzed.

Performance analysis

The distribution of the publications referring to this research topic is presented in Figure 1. The number of publications on this topic began in 1976 maintaining an irregular growth, for the year of 1998 it reaches its first peak in 2008, year in which that the greatest number of publications is presented (75), followed by 2014 (74). After 2015, the number of publications has been decreasing. Of the total of documents, 1 121 have been cited accumulating a total of 24 504 citations. There are 24 articles that have more than 100 citations, 93 have between 50 and 90 appointments and 623 articles have less than 10 citations.

Figure 1 Distribution of publications on M. anisopliae by year from 1976 to 2018 (October 9, 2018).  

With regard to the countries, it is observed that Brazil is the country with the highest number of contributions (241). The United States of America has second place with 228 publications, followed by the United Kingdom (139), China (97) and India (82). In Latin America, Mexico stands out with 54 publications, followed by Colombia with 22 and Argentina with 10 publications. The contributions come from authors from 160 institutions: 29 Brazilian, 21 American, 16 belonging to the United Kingdom, 13 Chinese and 11 Mexican. Within the 11 Mexican institutions are, the State University of Colima (12), UNAM (9), the University of Guanajuato (8), the College of Postgraduates (6) and the Autonomous University of Yucatan (4).

Table 1 shows the 10 journals with the highest number of publications, ordered by country and institution. The five journals with the highest number of publications are: Journal of Invertebrate Pathology, Biocontrol Science and Technology, Mycological Research, Biological Control and Biocontrol. They emphasize journals with emphasis on entomology, pathology and mycology, as well as biological control.

Table 1 Performance analysis: institute, country and magazine. 

Rank Instituto Pub. Institute Pub. Journal Pub.
1 International Centre of Insect Physiology and Ecology Nairobi 55 Brasil 241 Journal of Invertebrate Pathology 127
2 Universidade Federal do Rio Grande do Sul 47 Estados Unidos 228 Biocontrol Science and Technology 70
3 Universidade de Sao Paulo - USP 43 Reino Unido 139 Mycological Research 37
4 University of Bath 42 China 97 Biological Control 35
5 Cornell University 41 India 82 Biocontrol 21
6 Empresa Brasileira de Pesquisa Agropecuaria-Embrapa 39 Australia 57 Journal of Economic Entomology 21
7 Boyce Thompson Institute for Plant Research 35 Kenia 55 Veterinary Parasitology 21
8 Swansea University 29 México 54 FEMS Microbiology Letters 20
9 University of Maryland 28 Canadá 46 Neotropical Entomology 19
10 Universidade Federal de Goias 28 Irán 33 Journal of Applied Entomology 16

In Table 2, the 10 most cited articles are presented. These articles allow us to rescue the most relevant topics in this area of knowledge, such as: Genomic sequencing, biological control, genetic groups of Beauveria bassiana fungi, combinations of mycoinsecticides, pathogenicity, among other topics.

Table 2 The 10 most cited articles on control and M. anisopliae

Rank Authors Title Year Journal Quotes
1 Gao, Q.; Jin, K.; Ying, S.-H.; Zhang, Y.; Xiao, G., Shang, Y.; Duan, Z.; Hu, X.; Xie, X.-Q.; Zhou, G. and Peng, G. Genome sequencing and comparative transcriptomics of the model entomopathogenic fungi Metarhizium anisopliae and M. acridum 2011 PLoS Genetics 307
2 Bischoff, J. F.; Rehner, S. A. and Humber, R. A. A multilocus phylogeny of the Metarhizium anisopliae lineage 2009 Mycologia 264
3 Meyling, N. V. and Eilenberg, J. Ecology of the entomopathogenic fungi Beauveria bassiana and Metarhizium anisopliae in temperate agroecosystems: Potential for conservation biological control 2007 Biological Control 200
4 Zimmermann, G. Review on safety of the entomopathogenic fungus Metarhizium anisopliae 2007 Biocontrol Science and Technology 186
5 Hu, G. and St. Leger, R. J. Field studies using a recombinant mycoinsecticide (Metarhizium anisopliae) reveal that it is rhizosphere competent 2002 Applied and Environmental Microbiology 169
6 Wang, C. and St. Leger, R. J. A collagenous protective coat enables Metarhizium anisopliae to evade insect immune responses 2006 Proceedings of the National Academy of Sciences of the United States of America 152
7 Bidochka, M. J.; Kamp, A. M.; Lavender, T. M.; Dekoning, J. and De Croos, J. N. A. Habitat association in two genetic groups of the insect-pathogenic fungus Metarhizium anisopliae: Uncovering cryptic species? 2001 Applied and Environmental Microbiology 148
8 Leger, R. J. St.; Charnley, A. K. and Cooper, R. M. Characterization of cuticle-degrading proteases produced by the entomopathogen Metarhizium anisopliae 1987 Archives of Biochemistry and Biophysics 147
9 Kershaw, M. J.; Moorhouse, E.R.; Bateman, R.; Reynolds, S. E.; Charnley, A. K.; The Role of destruxins in the pathogenicity of Metarhizium anisopliae for three species of insect 1999 Journal of Invertebrate Pathology 142
10 St. Leger, R.  J.; Frank, D. C.; Roberts, D. W. and Staples, R. C. Molecular cloning and regulatory analysis of the cuticle degrading protease structural gene from the entomopathogenic fungus Metarhizium anisopliae 1992 European Journal of Biochemistry 142

Mapping of science

An analysis of the co-occurrence of terms was carried out, this provides an overview of the trends of the research, reflecting the topics addressed. The results establish 649 terms, of which those with co-occurrences greater than 10 were conserved, eliminating generic terms related to the research process, 389 terms were retained, organized in 3 clusters with 27 104 relationships. In Figure 2, the three clusters are observed: one referring to the activity/production of Metarhizium anisopliae (green cluster), another referring to the relationship and interaction with Beauveria bassiana (red cluster) and a third related to termites (blue cluster).

Figure 2 Visualization of the co-occurrence network using the VOSviewer® program.  

Discussion

This study dealt with bibliometric methods to know the behavior of scientific publications related to M. anisopliae. Based on these results, the three clusters related to this microorganism will be discussed separately below.

Production-activity

Chemical insecticides have been commonly used to control agricultural pests, termites and biological vectors, such as mosquitoes and ticks, these chemicals have generated harmful effects on the environment and resistance in pests and vectors. Due to the growing public concern, research has increased on alternatives, especially biological control agents such as fungi and entomopathogenic bacteria, for their control (Aw and Hue, 2017). The use of these fungi has evolved to become commercial products (bioinsecticides), so variables such as conidia production, sporulation and virulence (Zhang et al., 2018), are strategic in research that focuses on in evaluating culture media or methods of reproduction or propagation of spores or conidia of M. anisopliae (Shah et al., 2005).

The microbial activity refers to the changes that are expressed in the activity of the microorganisms, in the case of M. anisopliae, the investigations have included the biological activity of this microorganism when it is combined with essential oils (Rosas-Garcia et al., 2018), the analysis of the enzymatic activity of proteases obtained from M. anisopliae (St Leger et al., 1999; Shah et al., 200), their antifungal and fungal activity (Wang et al., 2005), insecticide (Charnley, 1991) and biological on various pests such as the white worm (Premnotrypes vorax Hustache) (Villamil et al., 2016), the red spider (Tetranychus evansi Baker & Pritchard) (Azandeme-Hounmalon et al., 2018), the potato moth (Phthorimaea operculella Zeller) (Khorrami et al., 2018), or the rhizosphere (Meyling and Eilenberg, 2007), just to mention a few examples.

Another sub-area of research relevant to this microorganism is the molecular aspect. Several investigations have analyzed the role of several enzymes (Dextruxins, MaNAG1, MaNAG2, MaNAG3 and MaNAG4) during the life cycle of Metarhizium anisopliae (de Oliveira et al., 2018), characterized the toxic ribonucleases of this microorganism as potential insecticides against ribosomes. for the control of disease vectors (Olombrada et al., 2017), as well as the function of some genes on the adaptation to the environment of this microorganism (Zeng et al., 2018) and its level of virulence (Santos et al., 2017).

Beauveria bassiana

B. bassiana is an entomopathogenic fungus (Abdu-Allah et al., 2015). Its mode of action is by contact (Alcala-Gomez et al., 2017), contaminating the microflora of the cuticle of the insect, germinating the spore on the insect pest and the hypha is introduced to the integument (tissue that forms the outer wall of the cuticle of the body of the insects) and enter the hemocoel and then spread by the hemolymph throughout the insect, causing its death by toxins (by toxemia) that this same secret (Petlamul and Prasertsan, 2012). It presents a great genetic diversity and usually develops in agricultural habitats (Bidochka et al., 1998; Rustiguel et al., 2018). Some of the pests it controls are: Whitefly (Trialeurodes vaporariorum Westwood), thrips (Thrips spp), blind hen (Phyllophaga spp. Bates), black donut (Spodoptera littoralis Boisduval), among others (Polanczyk et al., 2010; Mirhaghparast et al., 2013), as well as arthropod pests in poultry production (de Oliveira et al., 2014). It is currently used as a commercial biological control product in combination with M. anisopliae.

B. bassiana and M. anisopliae are combined due to the strategies that each follows, both their mode of action is contact, only that the former has a toxic strategy using oosporeins and invades the host while the latter has a growth strategy with the formation of appressoria and invasion of the host, this makes the effect for the biological control of pests greater (Rustiguel et al., 2018). Although other studies have focused on establishing which of these two fungi has better fungicidal effect (Barbosa et al., 2018), as well as their combinations with some insecticides (Rivero-Borja et al., 2018), with various chemical compounds, such as thymol, and application methods (Sinia and Guzmán-Novoa, 2018), for pest control. In general, the research topics deal with formulations, mortality and virulence (Oliveira et al., 2018), laboratory bioassays, field evaluation, and their evaluation for the control of various pests.

Termites

Termites (Coptotermes curvignathus (Holmgren) Isoptera: Rhinotermitidae, Coptotermes heimi) are a threat to plants and agricultural crops, although they are excellent decomposers of dead wood and other sources of cellulose, they become a serious problem when they attack homes and crops (Hussain et al., 2011). Due to significant losses in annual and perennial crops and damage, different control methods have been adopted such as physical, chemical and biological control (Wright et al., 2005). Chemical control has been a successful method to prevent termite attack, but biological methods are suitable alternatives (Verma et al., 2009), especially when seeking to reduce the use of chemicals that harm the environment and human health (Yii et al., 2016).

M. anisopliae and B. bassiana positively infect termites (Rath, 2000), by invading their host through the integument and causing death by depletion of host metabolites, due to a destruction of vital tissues or a combination of both (Wang and Powell, 2004). Previous research found that M. anisopliae causes a percentage of 71-84% of infections in termites after 15 days of treatment (Kin et al., 2017). Other studies have focused on topics such as: The mortality rate according to different concentrations of conidia per ml (Samsuddin et al., 2015; Riaz et al., 2017; Keppanan et al., 2018), its compatibility with some pesticides (Yii et al., 2016) or its effect on other species when used for termite control (Abonyo et al., 2016).

Conclusions

The objective of this work was to determine the most relevant issues regarding research concerning M. anisopliae during the period from 1976 to 2018, for which a bibliometric review of the concept Metarhizium anisopliae was carried out. In addition to establishing the most influential countries and institutes on the subject. The analysis of co-occurrence of terms and the discussion on the most important terms within the most cited articles was carried out. Derived from this analysis some important conclusions are obtained as it is that the topic has been relevant for the scientific community, with more intense periods in scientific productivity than others (2004-2014). The country with the highest number of publications is Brazil and Mexico ranks 8th worldwide in terms of the number of publications. The investigation could be grouped in that dedicated exclusively to M. anisopliae, the one where this fungus is combined with another (B. bassiana) and the use of M. anisopliae for the control of termites. Finally, it should be noted that this particular topic demonstrates the progress of research from basic science to applied science and finally to the development of technological solutions. Future contributions on this fungus will be about the discovery of new species and strains that have commercial potential with an emphasis on genetic engineering and biotechnology.

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Received: February 2019; Accepted: April 2019

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