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Iwanicki NSA, Castro T, Eilenberg J, Meyling NV, Moral RDA, Demétrio CGB, Delalibera I. Community composition of the entomopathogenic fungal genus Metarhizium in soils of tropical and temperate conventional and organic strawberry fields. J Invertebr Pathol 2024; 204:108079. [PMID: 38447862 DOI: 10.1016/j.jip.2024.108079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Revised: 01/20/2024] [Accepted: 02/27/2024] [Indexed: 03/08/2024]
Abstract
Studies on community composition and population structure of entomopathogenic fungi are imperative to link ecosystem functions to conservation biological control. We studied the diversity and abundance of Metarhizium spp. from soil of conventionally and organically farmed strawberry crops and from the adjacent field margins in two different climatic zones: Brazil (tropical) and Denmark (temperate), using the same isolating methods. In Brazilian strawberry soil, Metarhizium robertsii (n = 129 isolates) was the most abundant species, followed by M. humberi (n = 16); M. anisopliae (n = 6); one new taxonomically unassigned lineage Metarhizium sp. indet. 5 (n = 4); M. pingshaense (n = 1) and M. brunneum (n = 1). In Denmark, species composition was very different, with M. brunneum (n = 33) being isolated most commonly, followed by M. flavoviride (n = 6) and M. pemphigi (n = 5), described for the first time in Denmark. In total, 17 haplotypes were determined based on MzFG543igs sequences, four representing Danish isolates and 13 representing Brazilian isolates. No overall difference between the two climatic regimes was detected regarding the abundance of Metarhizium spp. in the soil in strawberry fields and the field margins. However, we found a higher Shannon's diversity index in organically managed soils, confirming a more diverse Metarhizium community than in soils of conventionally managed agroecosystems in both countries. These findings contribute to the knowledge of the indigenous diversity of Metarhizium in agricultural field margins with the potential to contribute to pest regulation in strawberry cropping systems.
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Affiliation(s)
- Natasha Sant Anna Iwanicki
- Department of Entomology and Acarology, Av Padua Dias, 11 - P.O. Box 9 - 13418-900, Piracicaba, SP, Brazil.
| | - Thiago Castro
- Department of Entomology and Acarology, Av Padua Dias, 11 - P.O. Box 9 - 13418-900, Piracicaba, SP, Brazil; Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg C, Denmark
| | - Jørgen Eilenberg
- Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg C, Denmark
| | - Nicolai V Meyling
- Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg C, Denmark
| | - Rafael de Andrade Moral
- Department of Exact Sciences, ESALQ- University of São Paulo, Av Padua Dias, 11 - P.O. Box 9 - 13418-900, Piracicaba, SP, Brazil
| | - Clarice Garcia Borges Demétrio
- Department of Exact Sciences, ESALQ- University of São Paulo, Av Padua Dias, 11 - P.O. Box 9 - 13418-900, Piracicaba, SP, Brazil
| | - Italo Delalibera
- Department of Entomology and Acarology, Av Padua Dias, 11 - P.O. Box 9 - 13418-900, Piracicaba, SP, Brazil
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Moreira FM, Machado TI, Torres CAR, de Souza HR, Celestino MF, Silva MA, Gomes GC, Cunha BBDR, dos Santos PDLB, de Carvalho Filho MR, de Castro MT, Monnerat RG. Purpureocillium lilacinum SBF054: Endophytic in Phaseolus vulgaris, Glycine max, and Helianthus annuus; Antagonistic to Rhizoctonia solani; and Virulent to Euschistus heros. Microorganisms 2024; 12:1100. [PMID: 38930483 PMCID: PMC11205651 DOI: 10.3390/microorganisms12061100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2024] [Revised: 05/16/2024] [Accepted: 05/22/2024] [Indexed: 06/28/2024] Open
Abstract
Microorganisms with multiple ecological functions can be a useful biotechnological resource in integrated pest- and disease-management programs. This work aimed to investigate the potential endophytic and virulent effects of a strain of Purpureocillium lilacinum on organic cultivation in Brazil. Specifically, the strain's ability to establish itself as an endophyte in common bean, soybean, and sunflower plants when inoculated via seed was evaluated. Furthermore, its antifungal activity against phytopathogens and its pathogenicity and virulence against insects of the order Lepidoptera, Coleoptera, and Hemiptera were evaluated. Furthermore, the strain was evaluated for its biochemical and physiological characteristics. For virulence bioassays, the experiments were conducted under a factorial scheme (2 × 3), with the following factors: (a) fungal inoculation and control without inoculum and (b) types of inocula (blastospores, aerial conidia, and metabolites). The treatments were sprayed on insect species at different stages of development. In summary, it was found that the SBF054 strain endophytically colonized the common bean, with partial recovery from the root tissues of soybean and sunflower plants, 30 days after inoculation; suppressed 86% of Rhizoctonia solani mycelial growth in an in vitro assay; and controlled eggs, nymphs, and Euschistus heros adults. These multifunctional abilities are mainly attributed to the strain's mechanisms of producing metabolites, such as organic acids, soluble nutrients, and hydrolytic enzymes.
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Affiliation(s)
- Flávia Melo Moreira
- SoluScience, SoluBio Tecnologias Agrícolas, Brasília 70632-300, Brazil; (C.A.R.T.); (H.R.d.S.); (M.F.C.); (M.A.S.); (G.C.G.); (B.B.d.R.C.); (P.d.L.B.d.S.); (M.R.d.C.F.); (M.T.d.C.); (R.G.M.)
| | | | - Caio Augusto Rosado Torres
- SoluScience, SoluBio Tecnologias Agrícolas, Brasília 70632-300, Brazil; (C.A.R.T.); (H.R.d.S.); (M.F.C.); (M.A.S.); (G.C.G.); (B.B.d.R.C.); (P.d.L.B.d.S.); (M.R.d.C.F.); (M.T.d.C.); (R.G.M.)
| | - Hebert Ribeiro de Souza
- SoluScience, SoluBio Tecnologias Agrícolas, Brasília 70632-300, Brazil; (C.A.R.T.); (H.R.d.S.); (M.F.C.); (M.A.S.); (G.C.G.); (B.B.d.R.C.); (P.d.L.B.d.S.); (M.R.d.C.F.); (M.T.d.C.); (R.G.M.)
| | - Matheus Felipe Celestino
- SoluScience, SoluBio Tecnologias Agrícolas, Brasília 70632-300, Brazil; (C.A.R.T.); (H.R.d.S.); (M.F.C.); (M.A.S.); (G.C.G.); (B.B.d.R.C.); (P.d.L.B.d.S.); (M.R.d.C.F.); (M.T.d.C.); (R.G.M.)
| | - Marco Antônio Silva
- SoluScience, SoluBio Tecnologias Agrícolas, Brasília 70632-300, Brazil; (C.A.R.T.); (H.R.d.S.); (M.F.C.); (M.A.S.); (G.C.G.); (B.B.d.R.C.); (P.d.L.B.d.S.); (M.R.d.C.F.); (M.T.d.C.); (R.G.M.)
| | - Giovana Cidade Gomes
- SoluScience, SoluBio Tecnologias Agrícolas, Brasília 70632-300, Brazil; (C.A.R.T.); (H.R.d.S.); (M.F.C.); (M.A.S.); (G.C.G.); (B.B.d.R.C.); (P.d.L.B.d.S.); (M.R.d.C.F.); (M.T.d.C.); (R.G.M.)
| | - Breno Beda dos Reis Cunha
- SoluScience, SoluBio Tecnologias Agrícolas, Brasília 70632-300, Brazil; (C.A.R.T.); (H.R.d.S.); (M.F.C.); (M.A.S.); (G.C.G.); (B.B.d.R.C.); (P.d.L.B.d.S.); (M.R.d.C.F.); (M.T.d.C.); (R.G.M.)
| | - Pedro de Luca Buffon dos Santos
- SoluScience, SoluBio Tecnologias Agrícolas, Brasília 70632-300, Brazil; (C.A.R.T.); (H.R.d.S.); (M.F.C.); (M.A.S.); (G.C.G.); (B.B.d.R.C.); (P.d.L.B.d.S.); (M.R.d.C.F.); (M.T.d.C.); (R.G.M.)
| | - Magno Rodrigues de Carvalho Filho
- SoluScience, SoluBio Tecnologias Agrícolas, Brasília 70632-300, Brazil; (C.A.R.T.); (H.R.d.S.); (M.F.C.); (M.A.S.); (G.C.G.); (B.B.d.R.C.); (P.d.L.B.d.S.); (M.R.d.C.F.); (M.T.d.C.); (R.G.M.)
| | - Marcelo Tavares de Castro
- SoluScience, SoluBio Tecnologias Agrícolas, Brasília 70632-300, Brazil; (C.A.R.T.); (H.R.d.S.); (M.F.C.); (M.A.S.); (G.C.G.); (B.B.d.R.C.); (P.d.L.B.d.S.); (M.R.d.C.F.); (M.T.d.C.); (R.G.M.)
| | - Rose Gomes Monnerat
- SoluScience, SoluBio Tecnologias Agrícolas, Brasília 70632-300, Brazil; (C.A.R.T.); (H.R.d.S.); (M.F.C.); (M.A.S.); (G.C.G.); (B.B.d.R.C.); (P.d.L.B.d.S.); (M.R.d.C.F.); (M.T.d.C.); (R.G.M.)
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Rashed A, van Herk WG. Pest Elaterids of North America: New Insights and Opportunities for Management. ANNUAL REVIEW OF ENTOMOLOGY 2024; 69:1-20. [PMID: 37562049 DOI: 10.1146/annurev-ento-120220-123249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/12/2023]
Abstract
The larval stages of click beetle (Coleoptera: Elateridae) species, several of which are serious agricultural pests, are called wireworms. Their cryptic subterranean habitat, resilience, among-species differences in ecology and biology, and broad host range, as well as the lack of objective economic injury thresholds, have rendered wireworms a challenging pest complex to control. Significant progress has been made in recent years, introducing a new effective class of insecticides and improving species identification and our understanding of species-specific phenology, chemical ecology (i.e., adult sex pheromones and larval olfactory cues), and abiotic and biotic factors influencing the efficacy of biological control agents. These new developments have created opportunities for further research into improving our risk assessment, monitoring, and integrated pest management capabilities.
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Affiliation(s)
- Arash Rashed
- Department of Entomology, Southern Piedmont Agricultural Research and Extension Center, Virginia Tech, Blackstone, Virginia, USA;
| | - Willem G van Herk
- Agassiz Research and Development Centre, Agriculture and Agri-Food Canada, Agassiz, British Columbia, Canada;
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Mesquita E, Hu S, Lima TB, Golo PS, Bidochka MJ. Utilization of Metarhizium as an insect biocontrol agent and a plant bioinoculant with special reference to Brazil. FRONTIERS IN FUNGAL BIOLOGY 2023; 4:1276287. [PMID: 38186633 PMCID: PMC10768067 DOI: 10.3389/ffunb.2023.1276287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Accepted: 11/30/2023] [Indexed: 01/09/2024]
Abstract
Brazil has a long history of using biological control and has the largest program in sugarcane agriculture to which a biocontrol program has been applied. This achievement is at least partly due to the utilization of the entomopathogenic fungus Metarhizium. This well-known fungal genus exhibits pathogenicity against a broad range of arthropod hosts and has been used globally as a biocontrol agent. This fungus is also a root symbiont, and in this capacity, it is a plant growth promoter. However, this feature (i.e., as a plant symbiont) has yet to be fully explored and implemented in Brazil, although the number of reports demonstrating Metarhizium's utility as a plant bioinoculant is increasing. The Brazilian bioproduct industry targets agricultural pests, and is limited to two Metarhizium species represented by four fungal isolates as active ingredients. Entomopathogenic fungi have also been successful in controlling arthropods of public health concern, as shown in their control of mosquitoes, which are vectors of diseases. The isolation of new indigenous Metarhizium isolates from a variety of substrates such as soil, insects, and plants shows the wide genetic diversity within this fungal genus. In this review, we emphasize the significance of Metarhizium spp. for the biological control of insects in Brazil. We also suggest that the experience and success of biological control with fungi in Brazil is an important resource for developing integrated pest management and sustainable strategies for pest control worldwide. Moreover, the future implementation prospects of species of Metarhizium being used as bioinoculants and possible new advances in the utility of this fungus are discussed.
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Affiliation(s)
- Emily Mesquita
- Department of Biological Sciences, Brock University, St. Catharines, ON, Canada
| | - Shasha Hu
- Department of Biological Sciences, Brock University, St. Catharines, ON, Canada
| | - Tais B. Lima
- Department of Biological Sciences, Brock University, St. Catharines, ON, Canada
| | - Patricia Silva Golo
- Department of Animal Parasitology, Veterinary Institute, Federal Rural University of Rio de Janeiro, Seropedica, RJ, Brazil
| | - Michael J. Bidochka
- Department of Biological Sciences, Brock University, St. Catharines, ON, Canada
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Couceiro JDC, De Fine Licht HH, Delalibera I, Meyling NV. Comparative gene expression and genomics reflect geographical divergence in the plant symbiotic and entomopathogenic fungal genus Metarhizium. FUNGAL ECOL 2022. [DOI: 10.1016/j.funeco.2022.101190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Li Y, Shen Q, An X, Xie Y, Liu X, Lian B. Organomineral fertilizer application enhances Perilla frutescens nutritional quality and rhizosphere microbial community stability in karst mountain soils. Front Microbiol 2022; 13:1058067. [PMID: 36504806 PMCID: PMC9730529 DOI: 10.3389/fmicb.2022.1058067] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Accepted: 11/08/2022] [Indexed: 11/25/2022] Open
Abstract
Introduction Applications of organomineral fertilizer (OMF) are important measures for developing organic agriculture in karst mountain areas. However, the influence of OMF on the structure and function of soil microbial diversity and their relationship with crop yield and quality are still unclear. Methods Based on soil science, crop science, and high-throughput sequencing methods, we investigated the changes of rhizosphere soil microbial communities of Perilla frutescens under different fertilization measures. Then, the relationship between P. frutescens yield and quality with soil quality was analyzed. Results The results showed that the addition of OMF increased the amount of total carbon and total potassium in soil. OF, especially OMF, improved P. frutescens yield and quality (e.g., panicle number per plant, main panicle length, and unsaturated fatty acid contents). Both OF and OMF treatments significantly increased the enrichment of beneficial microorganism (e.g., Bacillus, Actinomadura, Candidatus_Solibacter, Iamia, Pseudallescheria, and Cladorrhinum). The symbiotic network analysis demonstrated that OMF strengthened the connection among the soil microbial communities, and the community composition became more stable. Redundancy analysis and structural equation modeling showed that the soil pH, available phosphorus, and available potassium were significantly correlated with soil microbial community diversity and P. frutescens yield and quality. Discussion Our study confirmed that OMF could replace CF or common OF to improve soil fertility, crop yield and quality in karst mountain soils.
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Affiliation(s)
- Ying Li
- State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, China,College of Life Sciences, College of Marine Science and Engineering, Nanjing Normal University, Nanjing, China
| | - Qi Shen
- Institute of Medical Plant Physiology and Ecology, School of Pharmaceutical Sciences, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Xiaochi An
- College of Life Sciences, College of Marine Science and Engineering, Nanjing Normal University, Nanjing, China
| | - Yuanhuan Xie
- State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, China
| | - Xiuming Liu
- State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, China,*Correspondence: Xiuming Liu,
| | - Bin Lian
- College of Life Sciences, College of Marine Science and Engineering, Nanjing Normal University, Nanjing, China,Bin Lian,
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Nikoukar A, Rashed A. Integrated Pest Management of Wireworms (Coleoptera: Elateridae) and the Rhizosphere in Agroecosystems. INSECTS 2022; 13:769. [PMID: 36135470 PMCID: PMC9501627 DOI: 10.3390/insects13090769] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Revised: 08/04/2022] [Accepted: 08/10/2022] [Indexed: 06/16/2023]
Abstract
The rhizosphere is where plant roots, physical soil, and subterranean organisms interact to contribute to soil fertility and plant growth. In agroecosystems, the nature of the ecological interactions within the rhizosphere is highly dynamic due to constant disruptions from agricultural practices. The concept of integrated pest management (IPM) was developed in order to promote an approach which is complementary to the environment and non-target organisms, including natural enemies, by reducing the sole reliance on synthetic pesticides to control pests. However, some of the implemented integrated cultural and biological control practices may impact the rhizosphere, especially when targeting subterranean pests. Wireworms, the larval stage of click beetles (Coleoptera: Elateridae), are generalist herbivores and a voracious group of pests that are difficult to control. This paper introduces some existing challenges in wireworm IPM, and discusses the potential impacts of various control methods on the rhizosphere. The awareness of the potential implications of different pest management approaches on the rhizosphere will assist in decision-making and the selection of the control tactics with the least long-term adverse effects on the rhizosphere.
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Iwanicki NS, Botelho ABRZ, Klingen I, Júnior ID, Rossmann S, Lysøe E. Genomic signatures and insights into host niche adaptation of the entomopathogenic fungus Metarhizium humberi. G3 (BETHESDA, MD.) 2022; 12:6449448. [PMID: 34865006 PMCID: PMC9210286 DOI: 10.1093/g3journal/jkab416] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Accepted: 11/22/2021] [Indexed: 12/30/2022]
Abstract
The genus Metarhizium is composed of species used in biological control programs of agricultural pests worldwide. This genus includes common fungal pathogen of many insects and mites and endophytes that can increase plant growth. Metarhizium humberi was recently described as a new species. This species is highly virulent against some insect pests and promotes growth in sugarcane, strawberry, and soybean crops. In this study, we sequenced the genome of M. humberi, isolate ESALQ1638, and performed a functional analysis to determine its genomic signatures and highlight the genes and biological processes associated with its lifestyle. The genome annotation predicted 10633 genes in M. humberi, of which 92.0% are assigned putative functions, and ∼17% of the genome was annotated as repetitive sequences. We found that 18.5% of the M. humberi genome is similar to experimentally validated proteins associated with pathogen-host interaction. Compared to the genomes of eight Metarhizium species, the M. humberi ESALQ1638 genome revealed some unique traits that stood out, e.g., more genes functionally annotated as polyketide synthases (PKSs), overrepresended GO-terms associated to transport of ions, organic and amino acid, a higher percentage of repetitive elements, and higher levels of RIP-induced point mutations. The M. humberi genome will serve as a resource for promoting studies on genome structure and evolution that can contribute to research on biological control and plant biostimulation. Thus, the genomic data supported the broad host range of this species within the generalist PARB clade and suggested that M. humberi ESALQ1638 might be particularly good at producing secondary metabolites and might be more efficient in transporting amino acids and organic compounds.
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Affiliation(s)
- Natasha Sant′Anna Iwanicki
- Department of Entomology and Acarology, “Luiz de Queiroz” College of Agriculture (ESALQ/USP), Piracicaba 13418-900, Brazil
- Corresponding author: (N.S.I.); (E.L.)
| | | | - Ingeborg Klingen
- Division of Biotechnology and Plant Health, Norwegian Institute of Bioeconomy Research (NIBIO), Ås 1431, Norway
| | - Italo Delalibera Júnior
- Department of Entomology and Acarology, “Luiz de Queiroz” College of Agriculture (ESALQ/USP), Piracicaba 13418-900, Brazil
| | - Simeon Rossmann
- Division of Biotechnology and Plant Health, Norwegian Institute of Bioeconomy Research (NIBIO), Ås 1431, Norway
| | - Erik Lysøe
- Division of Biotechnology and Plant Health, Norwegian Institute of Bioeconomy Research (NIBIO), Ås 1431, Norway
- Corresponding author: (N.S.I.); (E.L.)
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Brancini GTP, Hallsworth JE, Corrochano LM, Braga GÚL. Photobiology of the keystone genus Metarhizium. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. B, BIOLOGY 2022; 226:112374. [PMID: 34954528 DOI: 10.1016/j.jphotobiol.2021.112374] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Revised: 11/12/2021] [Accepted: 12/08/2021] [Indexed: 06/14/2023]
Abstract
Metarhizium fungi are soil-inhabiting ascomycetes which are saprotrophs, symbionts of plants, pathogens of insects, and participate in other trophic/ecological interactions, thereby performing multiple essential ecosystem services. Metarhizium species are used to control insect pests of crop plants and insects that act as vectors of human and animal diseases. To fulfil their functions in the environment and as biocontrol agents, these fungi must endure cellular stresses imposed by the environment, one of the most potent of which is solar ultraviolet (UV) radiation. Here, we examine the cellular stress biology of Metarhizium species in context of their photobiology, showing how photobiology facilitates key aspects of their ecology as keystone microbes and as mycoinsectides. The biophysical basis of UV-induced damage to Metarhizium, and mechanistic basis of molecular and cellular responses to effect damage repair, are discussed and interpreted in relation to the solar radiation received on Earth. We analyse the interplay between UV and visible light and how the latter increases cellular tolerance to the former via expression of a photolyase gene. By integrating current knowledge, we propose the mechanism through which Metarhizium species use the visible fraction of (low-UV) early-morning light to mitigate potentially lethal damage from intense UV radiation later in the day. We also show how this mechanism could increase Metarhizium environmental persistence and improve its bioinsecticide performance. We discuss the finding that visible light modulates stress biology in the context of further work needed on Metarhizium ecology in natural and agricultural ecosystems, and as keystone microbes that provide essential services within Earth's biosphere.
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Affiliation(s)
- Guilherme T P Brancini
- Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP 14040-903, Brazil.
| | - John E Hallsworth
- Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, 19 Chlorine Gardens, Belfast BT9 5DL, Northern Ireland, UK
| | - Luis M Corrochano
- Departamento de Genética, Facultad de Biología, Universidad de Sevilla, 41012 Sevilla, Spain
| | - Gilberto Ú L Braga
- Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP 14040-903, Brazil.
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Couceiro JDC, Fatoretto MB, Demétrio CGB, Meyling NV, Delalibera Í. UV-B Radiation Tolerance and Temperature-Dependent Activity Within the Entomopathogenic Fungal Genus Metarhizium in Brazil. FRONTIERS IN FUNGAL BIOLOGY 2021; 2:645737. [PMID: 37744102 PMCID: PMC10512313 DOI: 10.3389/ffunb.2021.645737] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Accepted: 02/15/2021] [Indexed: 09/26/2023]
Abstract
Metarhizium comprises a phylogenetically diverse genus of entomopathogenic fungi. In Brazil, Metarhizium anisopliae s.str. subclade Mani 2 is predominantly isolated from insects, while M. robertsii and M. brunneum mostly occur in the soil environment. Solar radiation and high temperatures are important abiotic factors that can be detrimental to fungal propagules. We hypothesized that among 12 Brazilian isolates of Metarhizium spp., M. anisopliae Mani 2 (n = 6), being adapted to abiotic conditions of the phylloplane, is more tolerant to UV light and high temperatures than M. robertsii (n = 3) and M. brunneum (n = 3). Inoculum of each isolate was exposed to UV-B for up to 8 h and viability evaluated 48 h later. After 8 h under UV-B, most of the isolates had germination rates below 5%. Discs of mycelia were incubated at different temperatures, and diameter of colonies were recorded for 12 days. Mycelia of M. robertsii isolates grew faster at 33 °C, while M. anisopliae and M. brunneum grew most at 25 °C. Dry conidia were incubated at 20, 25 or 40 °C for 12 days, and then viabilities were examined. At 40 °C, conidia of five M. anisopliae isolates were the most tolerant. In the three experiments, considerable intra- and inter-specific variability was detected. The results indicate that conclusions about tolerance to these abiotic factors should be made only at the isolate level.
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Affiliation(s)
- Joel da Cruz Couceiro
- Laboratory of Pathology and Microbial Control of Insects, Department of Entomology and Acarology, “Luiz de Queiroz” College of Agriculture, University of São Paulo (ESALQ/USP), Piracicaba, Brazil
- Section for Organismal Biology, Department of Plant and Environmental Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Maíra Blumer Fatoretto
- Department of Exact Sciences, “Luiz de Queiroz” College of Agriculture, University of São Paulo (ESALQ/USP), Piracicaba, Brazil
| | - Clarice Garcia Borges Demétrio
- Department of Exact Sciences, “Luiz de Queiroz” College of Agriculture, University of São Paulo (ESALQ/USP), Piracicaba, Brazil
| | - Nicolai Vitt Meyling
- Section for Organismal Biology, Department of Plant and Environmental Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Ítalo Delalibera
- Laboratory of Pathology and Microbial Control of Insects, Department of Entomology and Acarology, “Luiz de Queiroz” College of Agriculture, University of São Paulo (ESALQ/USP), Piracicaba, Brazil
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Rehner SA. Genetic structure of Metarhizium species in western USA: Finite populations composed of divergent clonal lineages with limited evidence for recent recombination. J Invertebr Pathol 2020; 177:107491. [PMID: 33069670 DOI: 10.1016/j.jip.2020.107491] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Revised: 10/01/2020] [Accepted: 10/10/2020] [Indexed: 01/25/2023]
Abstract
Globally distributed, soil associated Metarhizium species used in insect biological control are evidently facultatively sexual and obligately outcrossing, yet sexual morphs have not been observed for most species and corroboration that they recombine in nature remains limited. Community-wide genetic diversity of Metarhizium species among 480 soil isolates from 14 states of western USA was investigated to assess the contributions of clonality and recombination in determining each species' population structure. Seven species, varying greater than 100-fold in relative abundance, were identified by phylogenetic analysis of 5' EF1-α (5TEF), including M. robertsii (n = 372), M. guizhouense (n = 37), M. brunneum (n = 37), M. lepidiotae (n = 14), M. pemphigi (n = 11), M. anisopliae (n = 7) and M. pingshaense (n = 2). Analyses of composite multilocus genotypes integrating 5TEF sequences, multilocus microsatellites and mating type idiomorphs conducted on a subset of 239 isolates revealed that all species populations display pronounced clonal structure. Following clone-correction procedures to remove redundant clonal genotypes and collapse clonal lineages, each species' population sample was determined to be composed of a dozen or fewer genetically unique individuals. Thus, the Metarhizium community inhabiting western USA is conservatively estimated to comprise as few as 34 distinct genetic individuals, with a single, geographically ubiquitous clonal lineage of M. robertsii constituting 45% of total isolates. M. robertsii was the only population determined to be in linkage equilibrium. However, the high proportion of private alleles differentiating most M. robertsii clonal lineages argues against contemporary panmixia, thus the recombination signal detected may be historical. Nevertheless, within M. robertsii, M. brunneum and M. guizhouense there are closely related genotypes of opposite mating type, which suggests that if recombination is contemporary, it likely occurs between closely related individuals. The restricted number of genetic individuals observed throughout western North American Metarhizium species may signify that these represent peripheral populations descended from limited numbers of founders among which there has been little recombination relative to the extent of clone expansion and within-clone genetic divergence.
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Affiliation(s)
- Stephen A Rehner
- USDA-ARS, Mycology and Nematology Genetic Diversity and Biology Laboratory, Beltsville, MD 20705, USA.
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Siqueira ACO, Mascarin GM, Gonçalves CRNCB, Marcon J, Quecine MC, Figueira A, Delalibera Í. Multi-Trait Biochemical Features of Metarhizium Species and Their Activities That Stimulate the Growth of Tomato Plants. FRONTIERS IN SUSTAINABLE FOOD SYSTEMS 2020. [DOI: 10.3389/fsufs.2020.00137] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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