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Půža V, Machado RAR. Systematics and phylogeny of the entomopathogenic nematobacterial complexes Steinernema-Xenorhabdus and Heterorhabditis-Photorhabdus. ZOOLOGICAL LETTERS 2024; 10:13. [PMID: 39020388 PMCID: PMC11256433 DOI: 10.1186/s40851-024-00235-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2024] [Accepted: 06/08/2024] [Indexed: 07/19/2024]
Abstract
Entomopathogenic nematodes of the genera Steinernema and Heterorhabditis, along with their bacterial symbionts from the genera Xenorhabdus and Photorhabdus, respectively, are important biological control agents against agricultural pests. Rapid progress in the development of genomic tools has catalyzed a transformation of the systematics of these organisms, reshaping our understanding of their phylogenetic and cophlylogenetic relationships. In this review, we discuss the major historical events in the taxonomy and systematics of this group of organisms, highlighting the latest advancements in these fields. Additionally, we synthesize information on nematode-bacteria associations and assess the existing evidence regarding their cophylogenetic relationships.
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Affiliation(s)
- Vladimír Půža
- Institute of Entomology, Biology centre of the Czech Academy of Sciences, Branišovská 31, České Budějovice, 37005, Czech Republic.
- Faculty of Agriculture and Technology, University of South Bohemia, Studentská 1668, České Budějovice, 37005, Czech Republic.
| | - Ricardo A R Machado
- Experimental Biology Research Group, Institute of Biology, Faculty of Sciences, University of Neuchâtel, Neuchâtel, 2000, Switzerland.
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Sajnaga E, Kazimierczak W. Evolution and taxonomy of nematode-associated entomopathogenic bacteria of the genera Xenorhabdus and Photorhabdus: an overview. Symbiosis 2020. [DOI: 10.1007/s13199-019-00660-0] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
AbstractEntomopathogenic bacteria from the genera Photorhabdus and Xenorhabdus are closely related Gram-negative bacilli from the family Enterobacteriaceae (γ-Proteobacteria). They establish obligate mutualistic associations with soil nematodes from the genera Steinernema and Heterorhabditis to facilitate insect pathogenesis. The research of these two bacterial genera is focused mainly on their unique interactions with two different animal hosts, i.e. nematodes and insects. So far, studies of the mutualistic bacteria of nematodes collected from around the world have contributed to an increase in the number of the described Xenorhabdus and Photorhabdus species. Recently, the classification system of entomopatogenic nematode microsymbionts has undergone profound revision and now 26 species of the genus Xenorhabdus and 19 species of the genus Photorhabdus have been identified. Despite their similar life style and close phylogenetic origin, Photorhabdus and Xenorhabdus bacterial species differ significantly in e.g. the nematode host range, symbiotic strategies for parasite success, and arrays of released antibiotics and insecticidal toxins. As the knowledge of the diversity of entomopathogenic nematode microsymbionts helps to enable the use thereof, assessment of the phylogenetic relationships of these astounding bacterial genera is now a major challenge for researchers. The present article summarizes the main information on the taxonomy and evolutionary history of Xenorhabdus and Photorhabdus, entomopathogenic nematode symbionts.
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Sajnaga E, Kazimierczak W, Skowronek M, Lis M, Skrzypek T, Waśko A. Steinernema poinari (Nematoda: Steinernematidae): a new symbiotic host of entomopathogenic bacteria Xenorhabdus bovienii. Arch Microbiol 2018; 200:1307-1316. [PMID: 29946739 PMCID: PMC6182613 DOI: 10.1007/s00203-018-1544-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Revised: 06/08/2018] [Accepted: 06/19/2018] [Indexed: 12/20/2022]
Abstract
Three strains of symbiotic bacteria were isolated from an entomopathogenic nematode Steinernema poinari retrieved from soil in eastern Poland. Using 16S rDNA, recA, gltX, gyrB, and dnaN gene sequences for phylogenetic analysis, these strains were shown to belong to the species Xenorhabdus bovienii. The nucleotide identity between the studied S. poinari microsymbionts and other X. bovienii strains calculated for 16S rDNA and concatenated sequences of four protein-coding genes was 98.7-100% and 97.9-99.5%, respectively. The phenotypic properties of the isolates also supported their close phylogenetic relationship with X. bovienii. All three tested X. bovienii strains of different Steinernema clade origin supported the recovery of infective juveniles and subsequent development of the nematode population. However, the colonization degree of new infective juvenile generations was significantly affected by the bacterial host donor/recipient. The colonization degree of infective juveniles reared on bacterial symbionts deriving from a non-cognate clade of nematodes was extremely low, but proved the possible host-switching between non-related Steinernema species.
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Affiliation(s)
- Ewa Sajnaga
- Laboratory of Biocontrol, Application and Production of EPN, Faculty of Biotechnology and Environmental Sciences, Centre for Interdisciplinary Research, John Paul II Catholic University of Lublin, Konstantynów 1J, 20-708, Lublin, Poland.
| | - Waldemar Kazimierczak
- Laboratory of Biocontrol, Application and Production of EPN, Faculty of Biotechnology and Environmental Sciences, Centre for Interdisciplinary Research, John Paul II Catholic University of Lublin, Konstantynów 1J, 20-708, Lublin, Poland
| | - Marcin Skowronek
- Laboratory of Biocontrol, Application and Production of EPN, Faculty of Biotechnology and Environmental Sciences, Centre for Interdisciplinary Research, John Paul II Catholic University of Lublin, Konstantynów 1J, 20-708, Lublin, Poland
| | - Magdalena Lis
- Laboratory of Biocontrol, Application and Production of EPN, Faculty of Biotechnology and Environmental Sciences, Centre for Interdisciplinary Research, John Paul II Catholic University of Lublin, Konstantynów 1J, 20-708, Lublin, Poland
| | - Tomasz Skrzypek
- Laboratory of Confocal and Electron Microscopy, Faculty of Biotechnology and Environmental Sciences, Centre for Interdisciplinary Research, John Paul II Catholic University of Lublin, Konstantynów 1J, 20-708, Lublin, Poland
| | - Adam Waśko
- Department of Biotechnology, Microbiology and Human Nutrition, University of Life Sciences in Lublin, Skromna 8, 20-704, Lublin, Poland
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Characterization of Polish Steinernema silvaticum isolates (Nematoda: Steinernematidae) using morphological and molecular data. J Helminthol 2018; 93:356-366. [PMID: 29661266 DOI: 10.1017/s0022149x18000366] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Four strains of entomopathogenic nematodes were isolated with a live trap method in southern Poland. The isolates were identified as Steinernema silvaticum based on morphological, morphometric and molecular data. Infective juveniles of Polish S. silvaticum isolates differ in body length from S. weiseri (951 vs 740 μm, respectively), and in the hyaline tail portion from S. kraussei (48 vs 38%, respectively). First-generation males of S. silvaticum are longer than those of S. kraussei, S. weiseri and S. ichnusae (1829 vs 1400, 1180 and 1341 μm, respectively). Males of S. silvaticum and a sister species S. kraussei can be distinguished by the distance from the anterior end to the nerve ring (142 vs 105 μm), spicule (66 vs 49 μm) and gubernaculum length (45 vs 33 μm), and the presence of a mucron. The analysis of internal transcribed spacer (ITS), D2-D3 and cox1 sequences of the tested nematodes revealed differences of 3-5%, 3% and 12-13%, respectively, from S. kraussei strains. The phylogeny of both nuclear and mitochondrial genes indicated close relationships of the Polish S. silvaticum isolates with S. kraussei, S. oregonense and S. cholashanense. The reproductive isolation of the studied isolates was confirmed by hybridization tests with other European feltiae-kraussei group representatives. This study has supplemented the original description of S. silvaticum with morphological and morphometric characterization of the first-generation males and females. This is also the first molecular study of this species based on a multi-gene approach.
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Kazimierczak W, Skrzypek H, Sajnaga E, Skowronek M, Waśko A, Kreft A. Strains of Photorhabdus spp. associated with polish Heterorhabditis isolates: their molecular and phenotypic characterization and symbiont exchange. Arch Microbiol 2017; 199:979-989. [PMID: 28382473 DOI: 10.1007/s00203-017-1368-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Revised: 03/10/2017] [Accepted: 03/15/2017] [Indexed: 12/24/2022]
Abstract
The relationships between six bacterial symbionts of the entomopathogenic nematodes Heterorhabditis bacteriophora and Heterorhabditis megidis from Poland to species and subspecies of the genus Photorhabdus were evaluated. This study was based on phylogenetic analysis of sequence data of five genes: 16S rRNA, gyrB, recA, gltX, and dnaN. The bacteria were also characterized phenotypically by biochemical and physiological tests. Our results have revealed that the Photorhabdus strains isolated from H. megidis belong to P. temperata, subsp. temperata and subsp. cinerea. Isolates from H. bacteriophora represent P. luminescens subs. kayaii and P. temperata subs. cinerea. This study for the first time provides evidence for H. bacteriophora and P. temperata subsp. cinerea symbiotic association. In addition, we tested whether the microsymbionts of the Polish H. bacteriophora and H. megidis isolates support the development of non-native nematode host population and colonization of their infective juveniles. It has been shown that the studied Photorhabdus strains can readily swap their nematode host, both at intra- and interspecies level. It supports the hypothesis of different symbiotic associations in the Heterorhabditis-Photorhabdus lineage.
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Affiliation(s)
- Waldemar Kazimierczak
- Laboratory of Biocontrol, Application and Production of EPN, Department of Biotechnology and Environmental Sciences, Centre for Interdisciplinary Research, John Paul II Catholic University of Lublin, ul. Konstantynów 1J, 20-708, Lublin, Poland.
| | - Henryk Skrzypek
- Laboratory of Ultrastructure and Electron Microscopy, Department of Biotechnology and Environmental Sciences, John Paul II Catholic University of Lublin, ul. Konstantynów 1F, 20-708, Lublin, Poland
| | - Ewa Sajnaga
- Laboratory of Biocontrol, Application and Production of EPN, Department of Biotechnology and Environmental Sciences, Centre for Interdisciplinary Research, John Paul II Catholic University of Lublin, ul. Konstantynów 1J, 20-708, Lublin, Poland
| | - Marcin Skowronek
- Laboratory of Biocontrol, Application and Production of EPN, Department of Biotechnology and Environmental Sciences, Centre for Interdisciplinary Research, John Paul II Catholic University of Lublin, ul. Konstantynów 1J, 20-708, Lublin, Poland
| | - Adam Waśko
- Department of Biotechnology, Human Nutrition and Science of Food Commodities, University of Life Sciences in Lublin, ul. Skromna 8, 20-704, Lublin, Poland
| | - Anna Kreft
- Laboratory of Biocontrol, Application and Production of EPN, Department of Biotechnology and Environmental Sciences, Centre for Interdisciplinary Research, John Paul II Catholic University of Lublin, ul. Konstantynów 1J, 20-708, Lublin, Poland
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