Bibliographies thématiques / Erwinia dacicola

Littérature scientifique sur le sujet « Erwinia dacicola »

Auteur : Grafiati
Publié le 10 mars 2023

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Articles de revues sur le sujet "Erwinia dacicola"

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Estes, Anne M., David J. Hearn, Judith L. Bronstein et Elizabeth A. Pierson. « The Olive Fly Endosymbiont, “Candidatus Erwinia dacicola,” Switches from an Intracellular Existence to an Extracellular Existence during Host Insect Development ». Applied and Environmental Microbiology 75, no 22 (18 septembre 2009) : 7097–106. http://dx.doi.org/10.1128/aem.00778-09.

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ABSTRACT As polyphagous, holometabolous insects, tephritid fruit flies (Diptera: Tephritidae) provide a unique habitat for endosymbiotic bacteria, especially those microbes associated with the digestive system. Here we examine the endosymbiont of the olive fly [Bactrocera oleae (Rossi) (Diptera: Tephritidae)], a tephritid of great economic importance. “Candidatus Erwinia dacicola” was found in the digestive systems of all life stages of wild olive flies from the southwestern United States. PCR and microscopy demonstrated that “Ca. Erwinia dacicola” resided intracellularly in the gastric ceca of the larval midgut but extracellularly in the lumen of the foregut and ovipositor diverticulum of adult flies. “Ca. Erwinia dacicola” is one of the few nonpathogenic endosymbionts that transitions between intracellular and extracellular lifestyles during specific stages of the host's life cycle. Another unique feature of the olive fly endosymbiont is that unlike obligate endosymbionts of monophagous insects, “Ca. Erwinia dacicola” has a G+C nucleotide composition similar to those of closely related plant-pathogenic and free-living bacteria. These two characteristics of “Ca. Erwinia dacicola,” the ability to transition between intracellular and extracellular lifestyles and a G+C nucleotide composition similar to those of free-living relatives, may facilitate survival in a changing environment during the development of a polyphagous, holometabolous host. We propose that insect-bacterial symbioses should be classified based on the environment that the host provides to the endosymbiont (the endosymbiont environment).
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Blow, Frances, Anastasia Gioti, Ian B. Goodhead, Maria Kalyva, Anastasia Kampouraki, John Vontas et Alistair C. Darby. « Functional Genomics of a Symbiotic Community : Shared Traits in the Olive Fruit Fly Gut Microbiota ». Genome Biology and Evolution 12, no 2 (12 décembre 2019) : 3778–91. http://dx.doi.org/10.1093/gbe/evz258.

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Abstract The olive fruit fly Bactrocera oleae is a major pest of olives worldwide and houses a specialized gut microbiota dominated by the obligate symbiont “Candidatus Erwinia dacicola.” Candidatus Erwinia dacicola is thought to supplement dietary nitrogen to the host, with only indirect evidence for this hypothesis so far. Here, we sought to investigate the contribution of the symbiosis to insect fitness and explore the ecology of the insect gut. For this purpose, we examined the composition of bacterial communities associated with Cretan olive fruit fly populations, and inspected several genomes and one transcriptome assembly. We identified, and reconstructed the genome of, a novel component of the gut microbiota, Tatumella sp. TA1, which is stably associated with Mediterranean olive fruit fly populations. We also reconstructed a number of pathways related to nitrogen assimilation and interactions with the host. The results show that, despite variation in taxa composition of the gut microbial community, core functions related to the symbiosis are maintained. Functional redundancy between different microbial taxa was observed for genes involved in urea hydrolysis. The latter is encoded in the obligate symbiont genome by a conserved urease operon, likely acquired by horizontal gene transfer, based on phylogenetic evidence. A potential underlying mechanism is the action of mobile elements, especially abundant in the Ca. E. dacicola genome. This finding, along with the identification, in the studied genomes, of extracellular surface structure components that may mediate interactions within the gut community, suggest that ongoing and past genetic exchanges between microbes may have shaped the symbiosis.
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Livadaras, Ioannis, Venetia Koidou, Eugenia Pitsili, Julietta Moustaka, John Vontas et Inga Siden-Kiamos. « Stably inherited transfer of the bacterial symbiont Candidatus Erwinia dacicola from wild olive fruit flies Bactrocera oleae to a laboratory strain ». Bulletin of Entomological Research 111, no 3 (5 février 2021) : 379–84. http://dx.doi.org/10.1017/s0007485321000031.

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AbstractThe olive fruit fly, Bactrocera oleae, the most serious pest of olives, requires the endosymbiotic bacteria Candidatus Erwinia dacicola in order to complete its development in unripe green olives. Hence a better understanding of the symbiosis of Ca. E. dacicola and its insect host may lead to new strategies for reduction of B. oleae and thus minimize its economic impact on olive production. Studies of this symbiosis are hampered as the bacterium cannot be grown in vitro and the established B. oleae laboratory populations, raised on artificial diets, are devoid of this bacterium. Here, we sought to develop a method to transfer the bacteria from wild samples to laboratory populations. We tested several strategies. Cohabitation of flies from the field with the laboratory line did not result in a stable transfer of bacteria. We provided the bacteria directly to the egg and also in the food of the larvae but neither approach was successful. However, a robust method for transfer of Ca. E. dacicola from wild larvae or adults to uninfected flies by transplantation to females was established. Single female lines were set up and the bacteria were successfully transmitted for at least three generations. These results open up the possibilities to study the interaction between the symbiont and the host under controlled conditions, in view of both understanding the molecular underpinnings of an exciting, unique in nature symbiotic relationship, as well as developing novel, innovative control approaches.
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Capuzzo, Caterina, Giuseppe Firrao, Luca Mazzon, Andrea Squartini et Vincenzo Girolami. « ‘Candidatus Erwinia dacicola’, a coevolved symbiotic bacterium of the olive fly Bactrocera oleae (Gmelin) ». International Journal of Systematic and Evolutionary Microbiology 55, no 4 (1 juillet 2005) : 1641–47. http://dx.doi.org/10.1099/ijs.0.63653-0.

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The taxonomic identity of the hereditary prokaryotic symbiont of the olive fly Bactrocera oleae (Diptera: Tephritidae) was investigated. In order to avoid superficial microbial contaminants and loosely associated saprophytic biota, flies were surface-sterilized at the larval stage and reared under aseptic conditions until adult emergence. B. oleae flies originating from different geographical locations and collected at different times of the year were tested. Bacterial isolation was undertaken from the cephalic oesophageal bulb, which is known to be a specific site of accumulation for the hosted microsymbionts in the adult insect. Despite evidence of multiplication cycles taking place within the insect, attempts at cultivation of the isolated bacteria ex situ were not productive at any stage, leading to the choice of unculturable status definition. PCR amplification and nucleotide sequencing of the entire 16S rRNA gene consistently yielded a single sequence that displayed marked similarity with enterobacterial lineages, with closest matches (97 %) to Erwinia persicina and Erwinia rhapontici. The novel taxon differs from common intestinal bacterial species of fruit flies and from instances of culturable bacteria previously described in B. oleae raised without sterility precautions, which we also observed as minority occupants or occasional contaminants. The symbiont's identity is also distinct from Pseudomonas savastanoi. In all observations, the numerically dominant inhabitant of the olive fly oesophageal organ was the same unculturable organism, whose presence at later stages was also regularly observed in the midgut. A novel species is proposed, by virtue of its unique properties, under the designation ‘Candidatus Erwinia dacicola’.
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Savio, Claudia, Luca Mazzon, Isabel Martinez-Sañudo, Mauro Simonato, Andrea Squartini et Vincenzo Girolami. « Evidence of two lineages of the symbiont ‘Candidatus Erwinia dacicola’ in Italian populations of Bactrocera oleae (Rossi) based on 16S rRNA gene sequences ». International Journal of Systematic and Evolutionary Microbiology 62, no 1 (1 janvier 2012) : 179–87. http://dx.doi.org/10.1099/ijs.0.030668-0.

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The close association between the olive fly Bactrocera oleae (Rossi) (Diptera: Tephritidae) and bacteria has been known for more than a century. Recently, the presence of a host-specific, hereditary, unculturable symbiotic bacterium, designated ‘Candidatus Erwinia dacicola’, has been described inside the cephalic organ of the fly, called the oesophageal bulb. In the present study, the 16S rRNA gene sequence variability of ‘Ca. E. dacicola’ was examined within and between 26 Italian olive fly populations sampled across areas where olive trees occur in the wild and areas where cultivated olive trees have been introduced through history. The bacterial contents of the oesophageal bulbs of 314 olive flies were analysed and a minimum of 781 bp of the 16S rRNA gene was sequenced. The corresponding host fly genotype was assessed by sequencing a 776 bp portion of the mitochondrial genome. Two ‘Ca. E. dacicola’ haplotypes were found (htA and htB), one being slightly more prevalent than the other (57 %). The two haplotypes did not co-exist in the same individuals, as confirmed by cloning. Interestingly, the olive fly populations of the two main Italian islands, Sicily and Sardinia, appeared to be represented exclusively by the htB and htA haplotypes, respectively, while peninsular populations showed both bacterial haplotypes in different proportions. No significant correlation emerged between the two symbiont haplotypes and the 16 host fly haplotypes observed, suggesting evidence for a mixed model of vertical and horizontal transmission of the symbiont during the fly life cycle.
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Nobre, Tânia. « Olive fruit fly and its obligate symbiont Candidatus Erwinia dacicola : Two new symbiont haplotypes in the Mediterranean basin ». PLOS ONE 16, no 9 (8 septembre 2021) : e0256284. http://dx.doi.org/10.1371/journal.pone.0256284.

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The olive fruit fly, specialized to become monophagous during several life stages, remains the most important olive tree pest with high direct production losses, but also affecting the quality, composition, and inherent properties of the olives. Thought to have originated in Africa is nowadays present wherever olive groves are grown. The olive fruit fly evolved to harbor a vertically transmitted and obligate bacterial symbiont -Candidatus Erwinia dacicola- leading thus to a tight evolutionary history between olive tree, fruit fly and obligate, vertical transmitted symbiotic bacterium. Considering this linkage, the genetic diversity (at a 16S fragment) of this obligate symbiont was added in the understanding of the distribution pattern of the holobiont at nine locations throughout four countries in the Mediterranean Basin. This was complemented with mitochondrial (four mtDNA fragments) and nuclear (ten microsatellites) data of the host. We focused on the previously established Iberian cluster for the B. oleae structure and hypothesised that the Tunisian samples would fall into a differentiated cluster. From the host point of view, we were unable to confirm this hypothesis. Looking at the symbiont, however, two new 16S haplotypes were found exclusively in the populations from Tunisia. This finding is discussed in the frame of host-symbiont specificity and transmission mode. To understand olive fruit fly population diversity and dispersion, the dynamics of the symbiont also needs to be taken into consideration, as it enables the fly to, so efficiently and uniquely, exploit the olive fruit resource.
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Estes, Anne M., Diego F. Segura, Andrew Jessup, Viwat Wornoayporn et Elizabeth A. Pierson. « Effect of the symbiont Candidatus Erwinia dacicola on mating success of the olive fly Bactrocera oleae (Diptera : Tephritidae) ». International Journal of Tropical Insect Science 34, S1 (5 septembre 2014) : S123—S131. http://dx.doi.org/10.1017/s1742758414000174.

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Nobre, Tânia. « Symbiosis in Sustainable Agriculture : Can Olive Fruit Fly Bacterial Microbiome Be Useful in Pest Management ? » Microorganisms 7, no 8 (3 août 2019) : 238. http://dx.doi.org/10.3390/microorganisms7080238.

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The applied importance of symbiosis has been gaining recognition. The relevance of symbiosis has been increasing in agriculture, in developing sustainable practices, including pest management. Insect symbiotic microorganisms’ taxonomical and functional diversity is high, and so is the potential of manipulation of these microbial partners in suppressing pest populations. These strategies, which rely on functional organisms inhabiting the insect, are intrinsically less susceptible to external environmental variations and hence likely to overcome some of the challenges posed by climate change. Rates of climate change in the Mediterranean Basin are expected to exceed global trends for most variables, and this warming will also affect olive production and impact the interactions of olives and their main pest, the obligate olive fruit fly (Bactrocera oleae). This work summarizes the current knowledge on olive fly symbiotic bacteria towards the potential development of symbiosis-based strategies for olive fruit fly control. Particular emphasis is given to Candidatus Erwinia dacicola, an obligate, vertically transmitted endosymbiont that allows the insect to cope with the olive-plant produced defensive compound oleuropein, as a most promising target for a symbiosis disruption approach.
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Estes, Anne M., David J. Hearn, Hannah J. Burrack, Polychronis Rempoulakis et Elizabeth A. Pierson. « Prevalence of Candidatus Erwinia dacicola in Wild and Laboratory Olive Fruit Fly Populations and Across Developmental Stages ». Environmental Entomology 41, no 2 (1 avril 2012) : 265–74. http://dx.doi.org/10.1603/en11245.

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Koumandou, Vassiliki Lila, Louis Papageorgiou, Eleni Picasi, Dimitra Mantzouni, Sofia Raftopoulou, Michael Ramm, Aegli Papathanassopoulou, Marianna Hagidimitriou, Nikos Cosmidis et Dimitrios Vlachakis. « Genomic analysis of the endosymbiotic bacterium Candidatus Erwinia dacicola provides insights for the management of the olive pest Bactrocera oleae ». Journal of Biotechnology 280 (août 2018) : S13. http://dx.doi.org/10.1016/j.jbiotec.2018.06.038.

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Thèses sur le sujet "Erwinia dacicola"

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Estes, Anne M. « LIFE IN A FLY : THE ECOLOGY AND EVOLUTION OF THE OLIVE FLY ENDOSYMBIONT, CANDIDATUS ERWINIA DACICOLA ». Diss., The University of Arizona, 2009. http://hdl.handle.net/10150/195735.

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Bacterial endosymbionts of eukaryotes are generally studied in terms of their benefit or detriment to their hosts. The constraints that the host's life history imposes on its endosymbionts are rarely considered, although bacterial genome content and size are influenced by both the biotic and abiotic factors in the environment. The host organism is the primary habitat of the endosymbiont. Thus, desecribing the environment a host provides its endosymbiont is essential for understanding the evolution of endosymbiotic bacteria. I propose a system to classify the endosymbiotic environment by three characteristics: 1) host life cycle 2) host metabolism, and 3) endosymbiont location relative to host tissues. Insect-bacterial mutualisms have been classified in terms of endosymbiont environment. The majority of insect-bacterial mutualisms currently studied involve monophagous, hemimetabolous hosts that provide a relatively constant endosymbiotic enviroment. A relatively constant environment may explain the extremely reduced genomes of their endosymbionts. In contrast, polyphagous, holometabolous hosts provide the most variable endosymbiotic environment. In this work, I examined the interactions between the polyphagous, holometabolous insect, Bactrocera oleae (Rossi), and the enteric gammaproteobacterium, Candidatus Erwinia dacicola, throughout host development. Candidatus Erwinia dacicola was found in the digestive system of all life stages of wild olive flies. PCR and microscopy demonstrated that Ca. Erwinia dacicola resided intracellularly in the gastric caeca of the larval midgut, but extracellularly in the lumen of the foregut and ovipositor diverticulum of adult flies. I document the widespread distribution and high frequency of Ca. Er. dacicola in ten populations of wild olive flies sampled in four countries (3 Old World and 1 New World). The relative abundance of the bacterium was highest in adults and less prevalent in the egg and pupal stages. Among adult flies, the bacterium was most common in ovipositing females. These results suggest that Ca. Er. dacicola is a persistent, autochthonous endosymbiont of the olive fly. Finally, mating initiation was examined to study the influence of Ca. Er. dacicola on mating between a laboratory and a wild population of olive flies from Israel. Behavioral differences between the two populations, not presence of the endosymbiont, explained mating initiation.
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Bigiotti, Gaia. « Relationships between the olive fly Bactrocera oleae and its endosymbiont Candidatus Erwinia dacicola : from basic knowledge to practical applications ». Doctoral thesis, 2019. http://hdl.handle.net/2158/1150083.

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This research investigates the study, from basical knowledge to practical applications, of the endosymbiosis between Bactrocera oleae (Rossi), a key pest of the olive crops in the Mediterranean basin, and Candidatus Erwinia dacicola. This bacterium is considered essential for the olive fly. It is vertically transmitted through generations and it benefits both larvae and adults in field; whereas, it had been rarely found in lab colonies, probably because of preservatives in artificial diets. The aim of this Ph.D. thesis is to evaluate the possibility of controlling the olive fly through the management of this symbiosis, with its interruption in field by the use of several natural substances and favouring its maintenance in lab rearing for Sterile Insect Technique purposes.
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