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DGIMI est une unité mixte de recherche ayant pour tutelles INRAE et l'Université de Montpellier. Elle est située sur le campus Triolet de l'Université de Montpellier et accueille une trentaine de personnels INRAE et UM.

Les recherches développées dans l'UMR DGIMI visent à mieux comprendre les interactions entre les insectes et leur environnement biotique et abiotique dans les agrosystèmes, selon deux axes thématiques 

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HAL : Dernières publications

  • [hal-05778778] Selective manipulation of the host RNA-polymerase transcription fidelity increases phenotypic mutations in an insect Parvovirus

    In the dynamic dance of evolution, organisms are often faced with fluctuating environments to which adaptation through selection of traditional heritable genetic mutations can be limiting. In this study, we unveil a refined mechanism of non-heritable variability in a virus with a compact DNA genome. We discovered that the genome of the Junona cœnia densovirus (JcDV) experiences a 10-fold lower transcription fidelity than the rest of the host’s transcriptome, despite the shared transcription machinery. We found that the virus’ capsid proteins interact with the host’s RNA Polymerase II, and further show that truncating these proteins through early stop codons largely restore the transcriptional fidelity of viral genes. These observations suggest a potential mechanism for the selective manipulation of transcription accuracy. We also pinpoint specific sequence contexts that may provide other knobs to finely control the local transcription fidelity. We estimate that this lower transcriptional fidelity results in more than 7% of the viral proteome bearing at least one non-synonymous mutation. The production of non-heritable functional diversity by hijacking the transcriptional machinery might be a refined strategy to enhance short term adaptation within the complex and ever-changing host-parasite interface, and might be shared by other genetic parasites. Our findings shed light on a virus-specific transcription fidelity control mechanism, expanding our understanding of adaptive strategies in biological entities.

    ano.nymous@ccsd.cnrs.fr.invalid (Thomas Labadie) 05 Oct 2026

    https://hal.inrae.fr/hal-05778778v1
  • [hal-05780447] Population Genomics Analysis to Reveal Evolutionary Dynamics of Fall Armyworm Global Invasion

    [...]

    ano.nymous@ccsd.cnrs.fr.invalid (Kiwoong Nam) 06 Oct 2026

    https://hal.inrae.fr/hal-05780447v1
  • [hal-05734157] Exploratory study to identify factors affecting the presence of genus Steinernema entomopathogenic nematodes in maize fields in South-West France

    Entomopathogenic nematodes (EPNs) are soil-dwelling parasites with a large range of insect hosts. They are valuable components of biological control products against insect pests (in greenhouses, for example) but their large-scale use in field crops is often limited by prohibitive costs, poor persistence, and low efficacy in non-native soils. The use of EPNs in conservation biological control — the use of different agricultural practices to promote the presence of native EPNs in field soils — has recently been proposed. Expanding our previous research mapping the occurrence of Steinernema spp. in maize fields in South-West France, this study explores different methodological approaches for investigating the biotic and abiotic factors associated with Steinernema presence, including soil properties, agricultural practices, and soil nematofauna characteristics. We hypothesised that Steinernema spp. occurrence is primarily driven by soil abiotic properties, agricultural management practices affecting habitat disturbance, and soil nematofauna characteristics, and is further influenced by plant diversity through crop rotations and cover crops. We performed univariate (Spearman’s correlation analysis and Chi2 tests) and multivariate (ANOVA) analyses on 46 explanatory variables obtained from 41 maize plots. We also tested a generalized linear model (GLM). For this last approach, given the large number of explanatory variables relative to the number of plots, we conducted a preliminary selection procedure and reduced the number of variables to four: mean weight diameter (MWD), CaO content, main crop alternation and the diversity of plant species used as cover crops. The various approaches converged to identify maize monoculture over five years as the strongest potential explanatory variable for the presence of Steinernema. These results suggest that, in the maize fields of South-West France, EPNs require a certain stability of the vegetation covering agricultural soils. These findings require confirmation in future studies with additional datasets obtained in other agronomic and pedoclimatic contexts.

    ano.nymous@ccsd.cnrs.fr.invalid (Elisabeth Depuydt) 01 Sep 2026

    https://hal.science/hal-05734157v1

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événement Du 03 oct. 2026 au 04 oct. 2026 Village des sciences de Montpellier

Fête de la science 2026

Pour cette édition 2026, le laboratoire DGIMI vous propose une animation sur la thématique "Insectes, plantes, vers, microbes : qui mange qui ?".
24 11
24 novembre 2026 Agropolis International - 1000, av. Agropolis, 34090 Montpellier

Journée scientifique du Vectopole Sud

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Cette année les présentations auront pour thématique "Le rôle des hôtes secondaires et des réservoirs (plantes, faune sauvage ou domestique) dans l'épidémiologie et la gestion des vecteurs et des ravageurs"

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