A5008509797- Insect-Plant Interactions and Control
- Insect symbiosis and bacterial influences
- Plant and animal studies
- Insect Resistance and Genetics
- Insect and Arachnid Ecology and Behavior
- Plant Parasitism and Resistance
- Insect and Pesticide Research
- Agricultural pest management studies
- Legume Nitrogen Fixing Symbiosis
- Global trade and economics
- Plant Virus Research Studies
- Southeast Asian Sociopolitical Studies
- Climate Change Policy and Economics
- French Urban and Social Studies
- Nematode management and characterization studies
- Agriculture and Rural Development Research
- Mediterranean and Iberian flora and fauna
- Hemiptera Insect Studies
- Global Energy and Sustainability Research
- Asian Geopolitics and Ethnography
- Collembola Taxonomy and Ecology Studies
- Genetic and Environmental Crop Studies
- Insect Pest Control Strategies
- Plant Reproductive Biology
- African Botany and Ecology Studies
L'Institut Agro
2020-2024
Institut de Génétique, Environnement et Protection des Plantes
2015-2024
Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement
2003-2024
Université de Rennes
2009-2024
Plant Protection Institute
2023
Institut Agro Rennes-Angers
2011-2022
Laboratoire d'Economie Appliquée de Grenoble
2016-2018
Électricité de France (France)
2014-2015
Institut National de la Recherche Agronomique
2001-2014
Université Bretagne Loire
2013
In theory, parthenogenetic lineages have low evolutionary potential because they inexorably accumulate deleterious mutations and do not generate much genotypic diversity. As a result, most taxa occupy the terminal nodes of phylogenetic trees. The rate mode development parthenogenesis are important factors to consider when assessing its costs benefits since determine both level genetic diversity ecological adaptability resulting lineages. origin is polyphyletic in many taxa, suggesting that...
Sympatric populations of insects adapted to different host plants, i.e., races, are good models investigate how natural selection can promote speciation in the face ongoing gene flow. However, races documented very few model systems and their gradual evolution into species, as assumed under a Darwinian view species formation, lacks strong empirical support. We aim at resolving this uncertainty by investigating specialization flow among pea aphid complex, Acyrthosiphon pisum . Genetic markers...
In the recent years, holobiont concept has emerged as a theoretical and experimental framework to study interactions between hosts their associated microbial communities in all types of ecosystems. The spread this many branches biology results from fairly realization ubiquitous nature host-associated microbes central role host biology, ecology, evolution. Through special series "Host-microbiota interactions: theory analysis," we wanted promote field research which considerable implications...
Cyclical parthenogens, including aphids, are attractive models for comparing the genetic outcomes of sexual and asexual reproduction, which determine their respective evolutionary advantages. In this study, we examined how reproductive mode shapes structure (cyclically parthenogenetic) (obligately populations aphid Rhopalosiphum padi by microsatellite allozyme data sets. Allozymes showed little polymorphism, confirming earlier studies with these markers. contrast, loci were highly...
Some bacterial symbionts alter their hosts reproduction through various mechanisms that enhance transmission in the host population. In addition to its obligatory symbiont Buchnera aphidicola, pea aphid Acyrthosiphon pisum harbors several facultative influencing aspects of ecology. Aphids reproduce by cyclical parthenogenesis whereby clonal and sexual alternate within annual life cycle. Many species, including aphid, also show variation reproductive mode at population level, with some...
Associations between microbes and animals are ubiquitous hosts may benefit from harbouring microbial communities through improved resource exploitation or resistance to environmental stress. The pea aphid, Acyrthosiphon pisum, is the host of heritable bacterial symbionts, including obligate endosymbiont Buchnera aphidicola several facultative symbionts. While symbionts supply aphids with key nutrients, influence their in many ways such as protection against natural enemies, heat tolerance,...
Abstract The aphid Myzus persicae is a destructive agricultural pest that displays an exceptional ability to develop resistance both natural and synthetic insecticides. To investigate the evolution of in this species we generated chromosome-scale genome assembly living panel >110 fully sequenced globally sampled clonal lines. Our analyses reveal remarkable diversity mutations segregating global populations M. . We show emergence spread these mechanisms influenced by host–plant...
THE word " contagion" is applied in pathology to the property and pro- cess by which, certain sorts of disease, affected body or part causes a disease like its own arise other bodies parts;
Abstract Despite the relative ease of isolating microsatellites, their development still requires substantial inputs time, money and expertise. For this reason there is considerable interest in using existing microsatellites on species from which markers were not cloned. We tested cross‐species amplification 48 aphid loci following genera: Aphidinae: Aphidini: Aphis Rhopalosiphum ; Macrosiphini: Acyrthosiphum , Brevicoryne Diuraphis Illinoia Macrosiphoniella Macrosiphum Metopeurum...
Abstract Aphids are the leading pests in agricultural crops. A large-scale sequencing of 40,904 ESTs from pea aphid Acyrthosiphon pisum was carried out to define a catalog 12,082 unique transcripts. strong AT bias found, indicating compositional shift between Drosophila melanogaster and A. . An silico profiling analysis characterized 135 transcripts specific pea-aphid tissues (relating bacteriocytes parthenogenetic embryos). This project is first address genetics Hemiptera hemimetabolous insect.
Adaptation to different resources has the potential cause rapid species diversification, but few studies have been able quantify time scale of recent adaptive radiations. The pea aphid, Acyrthosiphon pisum , a model speciation for host-specialized parasites, consists several biotypes (races or species) living on distinct legume hosts. To document this radiation, we used rapidly evolving sequences from Buchnera maternally transmitted bacterial endosymbiont aphids. Analyses pseudogene revealed...
Beneficial symbioses are widespread and diverse in the functions they provide to host ranging from nutrition protection. However, these partnerships with symbionts can be costly for host. Such costs, so called "direct costs", arise a trade-off between allocating resources symbiosis other such as reproduction or growth. Ecological costs may also exist when negatively affects interactions organisms environment. Although ecological deeply impact evolution of symbiosis, have received little...
Recent studies suggest that the pea aphid (Acyrthosiphon pisum) has low immune defenses. However, its components are largely undescribed, and notably, extensive characterization of circulating cells been missing. Here, we report five cell categories in hemolymph adults LL01 clone, devoid secondary symbionts (SS): prohemocytes, plasmatocytes, granulocytes, spherulocytes wax cells. Circulating lipid-filed rare; they otherwise localize at basis cornicles. Spherulocytes, likely sub-cuticular...
Virtually all aphids (Aphididae) harbor Buchnera aphidicola as an obligate endosymbiont to compensate nutritional deficiencies arising from their phloem diet. Many species within the Lachninae subfamily seem be consistently associated also with Serratia symbiotica. We have previously shown that both Cinara (Cinara) cedri and (Cupressobium) tujafilina (Lachninae: Eulachnini tribe) indeed established co-obligate associations S. However, while genomes of are similar, genome degradation differs...
Defences against parasites are typically associated with costs to the host that contribute maintenance of variation in resistance. This also applies defence provided by facultative bacterial endosymbiont Hamiltonella defensa, which protects its aphid hosts parasitoid wasps while imposing life-history costs. To investigate cost-benefit relationship within protected hosts, we introduced multiple isolates H. defensa same genetic backgrounds black bean aphids, Aphis fabae, and quantified...
Effector proteins play crucial roles in plant-parasite interactions by suppressing plant defenses and hijacking physiological responses to facilitate parasite invasion propagation. Although effector have been characterized many microbial pathogens, their nature role adaptation host plants are largely unknown insect herbivores. Aphids rely on salivary injected into the promote phloem sap uptake. Therefore, gaining insight repertoire evolution of aphid effectors is key unveiling mechanisms...