scholarly journals Characterization of symbiotic and associated bacteria from entomopathogenic nematode Heterorhabditis sp. (nematode: Heterorhabditidae) isolated from India

2020 ◽  
Vol 30 (1) ◽  
Author(s):  
Rashid Pervez ◽  
Showkat Ahmad Lone ◽  
Sasmita Pattnaik
Keyword(s):  
Insect Pests ◽  
Entomopathogenic Nematode ◽  
Alcaligenes Faecalis ◽  
Symbiotic Bacteria ◽  
Rrna Gene ◽  
Main Body ◽  
Associated Bacteria ◽  
Molecular Approaches

Abstract Background Entomopathogenic nematodes (EPNs) harboring symbiotic bacteria are one of the safest alternatives to the chemical insecticides for the control of various insect pests. Infective juveniles of EPNs locate a target insect, enter through the openings, and reach the hemocoel, where they release the symbiotic bacteria and the target gets killed by the virulence factors of the bacteria. Photorhabdus with Heterorhabditis spp. are well documented; little is known about the associated bacteria. Main body In this study, we explored the presence of symbiotic and associated bacteria from Heterorhabditis sp. (IISR-EPN 09) and characterized by phenotypic, biochemical, and molecular approaches. Six bacterial isolates, belonging to four different genera, were recovered and identified as follows: Photorhabdus luminescens, one each strain of Providencia vermicola, Pseudomonas entomophila, Alcaligenes aquatilis, and two strains of Alcaligenes faecalis based on the phenotypic, biochemical criteria and the sequencing of 16S rRNA gene. Conclusion P. luminescens is symbiotically associated with Heterorhabditis sp. (IISR-EPN 09), whereas P. vermicola, P. entomophila, A. aquatilis, and A. faecalis are the associated bacteria. Further studies are needed to determine the exact role of the bacterial associates with the Heterorhabditis sp.

scholarly journals Identification of Entomopathogenic Nematode-Associated Bacteria Originating from Mojokerto

2021 ◽  
Vol 5 (1) ◽  
pp. 31-38
Author(s):  
Theresia Desy Askitosari ◽  
Tjandra Pantjajani ◽  
Stephanie Nathania ◽  
Amelia Fedoragnes Wahyudi ◽  
Nancy Christina Sugianto
Keyword(s):  
Pest Control ◽  
Entomopathogenic Nematode ◽  
Enterobacter Aerogenes ◽  
Symbiotic Bacteria ◽  
Pcr Analysis ◽  
Rrna Gene ◽  
Biochemical Tests ◽  
Gram Negative ◽  
Natural Pest Control

Entomopathogenic nematodes (EPN) are one of the soil worms that have been widely used as a natural pest control. EPN has its pathogenic capability because of the mutualistic interactions between nematodes and symbiotic bacteria inside the digestive tract of nematodes. Symbiotic bacteria capable of producing exoenzymes that are toxic to insects. The isolation of symbiotic bacteria accomplished by infection of obtained EPN (Belik II isolate) into Tenebrio molitor larvae. Symbiotic bacteria were isolated from the hemolymph of dead larvae on NBTA media. Isolation of symbiotic bacteria was successfully obtained two morphologically distinct bacteria: B 3.1 isolate and B 4 isolate. Both bacteria were further identified using PCR analysis of the 16S rRNA gene. Based on the sequencing results, the B 3.1 isolate was in accordance with Acinetobacter pittii strain ATCC 19004, while B 4 isolate was in accordance with bacteria Enterobacter aerogenes strain KCTC 2190. The characterization of B 3.1 isolate was shown to have similarities with Acinetobacter sp., i.e.: gram-negative, non - motile, rod-shaped, and some other characteristics of biochemical tests. While the characterization of B 4 isolate was shown to have similarities with E. aerogenes i.e.: gram-negative, rod-shaped, motile, and some other characteristics of biochemical tests. These findings will be the potential to be applied as biological agents in pest control.

scholarly journals Nanopore-Sequencing Characterization of the Gut Microbiota of Melolontha melolontha Larvae: Contribution to Protection against Entomopathogenic Nematodes?

Pathogens ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 396
Author(s):  
Ewa Sajnaga ◽  
Marcin Skowronek ◽  
Agnieszka Kalwasińska ◽  
Waldemar Kazimierczak ◽  
Karolina Ferenc ◽  
...  
Keyword(s):  
Gut Microbiota ◽  
Entomopathogenic Nematodes ◽  
Bacterial Species ◽  
Antagonistic Activity ◽  
Rrna Gene ◽  
Nanopore Sequencing ◽  
Bacterial Phyla ◽  
Melolontha Melolontha

This study focused on the potential relationships between midgut microbiota of the common cockchafer Melolontha melolontha larvae and their resistance to entomopathogenic nematodes (EPN) infection. We investigated the bacterial community associated with control and unsusceptible EPN-exposed insects through nanopore sequencing of the 16S rRNA gene. Firmicutes, Proteobacteria, Actinobacteria, and Bacteroidetes were the most abundant bacterial phyla within the complex and variable midgut microbiota of the wild M. melolontha larvae. The core microbiota was found to include 82 genera, which accounted for 3.4% of the total number of identified genera. The EPN-resistant larvae differed significantly from the control ones in the abundance of many genera belonging to the Actinomycetales, Rhizobiales, and Clostridiales orders. Additionally, the analysis of the microbiome networks revealed different sets of keystone midgut bacterial genera between these two groups of insects, indicating differences in the mutual interactions between bacteria. Finally, we detected Xenorhabdus and Photorhabdus as gut residents and various bacterial species exhibiting antagonistic activity against these entomopathogens. This study paves the way to further research aimed at unravelling the role of the host gut microbiota on the output of EPN infection, which may contribute to enhancement of the efficiency of nematodes used in eco-friendly pest management.

Bacterial Symbiotes, Their Presence in Head Lice, and Potential Treatment Avenues

2006 ◽  
Vol 10 (1) ◽  
pp. 2-6 ◽  
Author(s):  
Craig N. Burkhart ◽  
Craig G. Burkhart
Keyword(s):  
Head Louse ◽  
Human Head ◽  
Blood Feeding ◽  
Symbiotic Bacteria ◽  
Head Lice ◽  
Pediculus Humanus ◽  
Toxic Agents ◽  
Anatomic Localization

Background: Pediculus humanus capitis (head lice) belongs to the order Anoplura, which are blood-feeding ectoparasites that live on human hair. Within these insects reside symbiotic bacteria that enable the insect to flourish on dietary sources of limited nutritional value. These symbiotic bacteria are essential to the survival of the insect. Objective: To assess the feasibility of treating head lice by altering their symbiotic bacteria. Methods: In addition to a literature review of the expanded role of symbiotic bacteria in other organisms, the anatomic localization of their presence in human head lice and molecular characterization of the head louse symbiont were analyzed. Results: Anatomically, the bacterial symbiotes are localized to the midgut mycetome in males and the ovaries in females. The 16S ribosomal ribonucleic acid phylogenetic analysis was presented. Features of this bacterial symbiote may make this symbiont accessible as a target for pediculocidal and ovicidal therapy by altering its habitat and existence. Conclusions: An understanding of the nature of bacterial symbiotes of head lice might lead to alternative strategies for eradication or inhibition of these necessary bacteria, thereby controlling head lice with less toxic agents than conventional insecticides, to which the organism continues to increase its resistance.

Variation in the microbiome of the spider mite Tetranychus truncatus with sex, instar and endosymbiont infection

2020 ◽  
Vol 96 (2) ◽  
Author(s):  
Yu-Xi Zhu ◽  
Zhang-Rong Song ◽  
Shi-Mei Huo ◽  
Kun Yang ◽  
Xiao-Yue Hong
Keyword(s):  
Spider Mite ◽  
Potential Role ◽  
Developmental Stages ◽  
Spider Mites ◽  
Rrna Gene ◽  
Associated Bacteria ◽  
Operational Taxonomic Units ◽  
Dominant Bacteria ◽  
The 16S Rrna Gene

ABSTRACT Most arthropod-associated bacterial communities play a crucial role in host functional traits, whose structure could be dominated by endosymbionts. The spider mite Tetranychus truncatus is a notorious agricultural pest harboring various endosymbionts, yet the effects of endosymbionts on spider mite microbiota remain largely unknown. Here, using deep sequencing of the 16S rRNA gene, we characterized the microbiota of male and female T. truncatus with different endosymbionts (Wolbachia and Spiroplasma) across different developmental stages. Although the spider mite microbiota composition varied across the different developmental stages, Proteobacteria were the most dominant bacteria harbored in all samples. Positive relationships among related operational taxonomic units dominated the significant coassociation networks among bacteria. Moreover, the spider mites coinfected with Wolbachia and Spiroplasma had a significantly higher daily fecundity and juvenile survival rate than the singly infected or uninfected spider mites. The possible function of spider-mite associated bacteria was discussed. Our results highlight the dynamics of spider mite microbiotas across different life stages, and the potential role of endosymbionts in shaping the microbiota of spider mites and improving host fitness.

The usefulness of post-genomics tools for characterization of the amine cross-talk in mammalian cells

2007 ◽  
Vol 35 (2) ◽  
pp. 381-385 ◽  
Author(s):  
F. Sánchez-Jiménez ◽  
R. Montañez ◽  
F. Correa-Fiz ◽  
P. Chaves ◽  
C. Rodríguez-Caso ◽  
...  
Keyword(s):  
Systems Biology ◽  
Mathematical Models ◽  
Mammalian Cells ◽  
State Of The Art ◽  
Molecular Approaches ◽  
Amine Metabolism ◽  
Genomics Tools ◽  
Stored Information

Evidence is growing in favour of a relationship between cancer and chronic inflammation, and particularly of the role of a polyamine and histamine metabolic interplay involved in these physiopathological problems, which are indeed highly complex biological systems. Decodification of the complex inter- and intra-cellular signalling mechanisms that control these effects is not an easy task, which must be helped by systems biology technologies, including new tools for location and integration of database-stored information and predictive mathematical models, as well as functional genomics and other experimental molecular approaches necessary for hypothesis validation. We review the state of the art and present our latest efforts in this area, focused on the amine metabolism field.

scholarly journals Genetic Diversity and Horizontal Transfer of Genes Involved in Oxidation of Reduced Phosphorus Compounds by Alcaligenes faecalis WM2072

2005 ◽  
Vol 71 (1) ◽  
pp. 290-296 ◽  
Author(s):  
Marlena M. Wilson ◽  
William W. Metcalf
Keyword(s):  
Pseudomonas Stutzeri ◽  
Alcaligenes Faecalis ◽  
Phosphorus Compounds ◽  
Rrna Gene ◽  
Sequencing Data ◽  
16S Rrna Gene Analysis ◽  
Evolutionary Selection ◽  
Selection For ◽  
Phosphite Dehydrogenase

ABSTRACT Enrichment was performed to isolate organisms that could utilize reduced phosphorus compounds as their sole phosphorus sources. One isolate that grew well with either hypophosphite or phosphite was identified by 16S rRNA gene analysis as a strain of Alcaligenes faecalis. The genes required for oxidation of hypophosphite and phosphite by this organism were identified by using transposon mutagenesis and include homologs of the ptxD and htxA genes of Pseudomonas stutzeri WM88, which encode an NAD-dependent phosphite dehydrogenase (PtxD) and 2-oxoglutarate-dependent hypophosphite dioxygenase (HtxA). This organism also has the htxB, htxC, and htxD genes that comprise an ABC-type transporter, presumably for hypophosphite and phosphite transport. The role of these genes in reduced phosphorus metabolism was confirmed by analyzing the growth of mutants in which these genes were deleted. Sequencing data showed that htxA, htxB, htxC, and htxD are virtually identical to their homologs in P. stutzeri at the DNA level, indicating that horizontal gene transfer occurred. However, A. faecalis ptxD is very different from its P. stutzeri homolog and represents a new ptxD lineage. Therefore, this gene has ancient evolutionary roots in bacteria. These data suggest that there is strong evolutionary selection for the ability of microorganisms to oxidize hypophosphite and phosphite.

scholarly journals Isolation and Characterization of Photorhabdus Spp. (Enterobacteriaceae) Isolated From Heterorhabditis Bacteriophora in Kashere, Nigeria

2021 ◽  
Vol 25 (8) ◽  
pp. 1345-1348
Author(s):  
H.U. Aliyu ◽  
F. Tahir ◽  
E.B. Agbo ◽  
S.L. Kela
Keyword(s):  
Biological Control ◽  
Bacterial Isolate ◽  
Insect Pests ◽  
Entomopathogenic Nematode ◽  
Heterorhabditis Bacteriophora ◽  
Biochemical Tests ◽  
Susceptible Host ◽  
Isolation And Characterization ◽  
Biological Control Potential

Photorhabdus bacteria are symbiotically associated with the infective juveniles of entomopathogenic nematodes of the genus Heterorhabditis. These bacteria after infecting a susceptible host, produces a host of lethal toxins that killthe insect hosts within 24 to 72 hours. Consequently they have emerged and are trending as excellent biological control agents against insect pests of agricultural crops. Therefore, this study aim to isolate, identify and test the pathogenicity of Photorhabdus bacteria isolated from Heterorhabditis bacteriophora, entomopathogenic nematode from Kashere, Gombe State, Nigeria. To this end phenotypic and biochemical tests were conducted. The tests conducted showed that the isolate exhibited characteristics similar to those of Photorhabdus bacteria that have been identified. Last instar larvae of G. mellonella exposed to different concentrations of the bacterial isolate showed some level of susceptibility of the larvae to the bacterial isolate confirming its biological control potential.

scholarly journals KOMPATIBILITAS CENDAWAN METARHIZIUM ANISOPLIAE (METSCHN.) SOROKIN DENGAN NEMATODA ENTOMOPATOGEN STEINERNEMA SP.

2017 ◽  
Vol 17 (2) ◽  
pp. 111
Author(s):  
Imron Rosyidi ◽  
Hari Purnomo ◽  
Nanang Tri Haryadi ◽  
Mohammad Hoesain
Keyword(s):  
Biological Control ◽  
Metarhizium Anisopliae ◽  
Insect Pests ◽  
Entomopathogenic Nematode ◽  
Research Result ◽  
Symbiotic Bacteria ◽  
Randomized Design ◽  
Completely Randomized Design

Compatibility Metarhizium anisopliae (Metschn.) Sorokin with entomopathogenic nematode Steinernema sp. Metarhizium anisopliae (Metschn.) Sorokin and entomopathogenic nematode Steinernema sp. can be used as biological control of insect pests. The objective of this research was to identify compatibility between fungus M. anisopliae with entomopathogenic nematode Steinernema sp. This research was conducted using a completely randomized design (CRD) consisting of 5 treatments and repeated 5 times. The treatment used was M. anisopliae isolates Jombang 1 with Steinernema sp. (M1), M. anisopliae Jombang 2 with Steinernema sp. (M2), M. anisopliae isolates Kediri with Steinernema sp. (M3), M. anisopliae isolates Bondowoso with Steinernema sp. (M4), and M. anisopliae isolates Banyuwangi with Steinernema sp. (M5). Based on this research result, compatibility between the fungus M. anisopliae with entomopathogenic nematode Steinernema sp. was antagonistic. This occurs due to the symbiotic bacteria Xenorhabdus sp. that produced compounds antimycotic and capable to inhibit the growth of fungus M. anisopliae.

scholarly journals Molecular characterization of the stomach microbiota in patients with gastric cancer and in controls

2009 ◽  
Vol 58 (4) ◽  
pp. 509-516 ◽  
Author(s):  
Johan Dicksved ◽  
Mathilda Lindberg ◽  
Magnus Rosenquist ◽  
Helena Enroth ◽  
Janet K. Jansson ◽  
...  
Keyword(s):  
Gastric Cancer ◽  
Gastric Acid ◽  
Rflp Analysis ◽  
Rrna Gene ◽  
Bacterial Phyla ◽  
Increased Risk ◽  
H Pylori ◽  
Development Of Gastric Cancer

Persistent infection of the gastric mucosa by Helicobacter pylori can initiate an inflammatory cascade that progresses into atrophic gastritis, a condition associated with reduced capacity for secretion of gastric acid and an increased risk of developing gastric cancer. The role of H. pylori as an initiator of inflammation is evident but the mechanism for development into gastric cancer has not yet been proven. A reduced capacity for gastric acid secretion allows survival and proliferation of other microbes that normally are killed by the acidic environment. It has been postulated that some of these species may be involved in the development of gastric cancer; however, their identities are poorly defined. In this study, the gastric microbiota from ten patients with gastric cancer was characterized and compared with that from five dyspeptic controls using the molecular profiling approach terminal restriction fragment length polymorphism (T-RFLP), in combination with 16S rRNA gene cloning and sequencing. T-RFLP analysis revealed a complex bacterial community in the cancer patients that was not significantly different from that in the controls. Sequencing of 140 clones revealed 102 phylotypes, with representatives from five bacterial phyla (Firmicutes, Bacteroidetes, Proteobacteria, Actinobacteria and Fusobacteria). The data revealed a relatively low abundance of H. pylori and showed that the gastric cancer microbiota was instead dominated by different species of the genera Streptococcus, Lactobacillus, Veillonella and Prevotella. The respective role of these species in development of gastric cancer remains to be determined.

scholarly journals Culex pipiens and Culex restuans egg rafts harbor diverse bacterial communities compared to their midgut tissues

2020 ◽  
Vol 13 (1) ◽  
Author(s):  
Elijah O. Juma ◽  
Chang-Hyun Kim ◽  
Christopher Dunlap ◽  
Brian F. Allan ◽  
Chris M. Stone
Keyword(s):  
Bacterial Communities ◽  
Culex Pipiens ◽  
Mosquito Species ◽  
Gravid Female ◽  
Distance Matrix ◽  
Rrna Gene ◽  
Culex Restuans ◽  
Host Tissues

Abstract Background The bacterial communities associated with mosquito eggs are an essential component of the mosquito microbiota, yet there are few studies characterizing and comparing the microbiota of mosquito eggs to other host tissues. Methods We sampled gravid female Culex pipiens L. and Culex restuans Theobald from the field, allowed them to oviposit in the laboratory, and characterized the bacterial communities associated with their egg rafts and midguts for comparison through MiSeq sequencing of the 16S rRNA gene. Results Bacterial richness was higher in egg rafts than in midguts for both species, and higher in Cx pipiens than Cx. restuans. The midgut samples of Cx. pipiens and Cx. restuans were dominated by Providencia. Culex pipiens and Cx. restuans egg rafts samples were dominated by Ralstonia and Novosphingobium, respectively. NMDS ordination based on Bray-Curtis distance matrix revealed that egg-raft samples, or midgut tissues harbored similar bacterial communities regardless of the mosquito species. Within each mosquito species, there was a distinct clustering of bacterial communities between egg raft and midgut tissues. Conclusion These findings expand the list of described bacterial communities associated with Cx. pipiens and Cx. restuans and the additional characterization of the egg raft bacterial communities facilitates comparative analysis of mosquito host tissues, providing a basis for future studies seeking to understand any functional role of the bacterial communities in mosquito biology.

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