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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-05561382] High-throughput phenotyping of wheat ear surface area and ear density in the field

    Ear density (D e ) and ear surface area (S e ) in cereals are important traits for adaptation to low inputs and climate change. Here we propose a high-throughput field phenotyping method to estimate these traits using nadir and 45 • RGB images acquired by the Phenomobile ground robot. First, the YOLOv5 ear detection algorithm is applied to nadir RGB images to estimate D e . Second, an ear segmentation algorithm is applied to nadir and 45 • RGB images to compute the ear gap fraction at different viewing angles. The Beer-Lambert law is then inverted to compute the ear area index (EAI) from the observed ear gap fraction. S e is finally derived as the ratio between EAI and D e .</p><p>We applied the methodology to a panel of 10 commercial bread wheat varieties to analyse how both traits vary across 12 environments. The relative error obtained for awnless varieties is 12% (56 ears m -2 ) for D e and 18% (1.3 cm 2 ) for S e . For awned varieties, ground-truth observations of S e were shown to be biased due to an overestimation of awns contribution, leading to an error of 41% (3.6 cm 2 ). S e was strongly correlated with grain dry mass per ear at harvest (r 2 = 0.80 across genotypes and environments, r 2 per genotype ranged between 0.80 and 0.95) and EAI was strongly correlated with grain yield (r 2 = 0.83). These results indicate that both EAI and S e can be interesting non-destructive proxies for yield and grain dry mass per ear.

    ano.nymous@ccsd.cnrs.fr.invalid (Marie-Pia D’argaignon) 20 Mar 2026

    https://hal.inrae.fr/hal-05561382v1
  • [hal-05438464] Unveiling the Impact of Porphyromonas gingivalis ‐Associated Periodontitis on Stroke Outcome in Mice

    Background Periodontitis is a chronic inflammatory condition with infectious origin that affects the tissues supporting the teeth. Increasing epidemiological evidence suggests that periodontitis is a risk factor for ischemic stroke with associated adverse outcomes. However, the underlying mechanism of this association remains incompletely elucidated. Methods We used a C57BL/6J mice model of ischemic stroke induced by transitory occlusion of the middle cerebral artery in the presence or absence of ligature‐induced periodontitis using Porphyromonas gingivalis ‐soaked ligatures. Stroke severity was evaluated through infarct volume, sensorimotor deficit, blood–brain barrier (BBB) integrity, and markers of systemic and brain inflammation. The direct effect of P gingivalis on BBB endothelial cells was further explored in vitro. Results Mice with P gingivalis ‐associated periodontitis showed a significant exacerbation of stroke severity: larger infarct volume, more severe sensorimotor deficit, greater BBB disruption, and increased brain neutrophil infiltration compared with sham. Systemic inflammation was also markedly elevated. Intravenous administration of P gingivalis alone, without gingival injury, before transitory occlusion of the middle cerebral artery was sufficient to amplify brain inflammation and stroke lesions. In vitro P gingivalis, through its gingipain proteases, directly impaired BBB integrity by increasing endothelial permeability and disrupting tight‐junction proteins. Conclusions Our findings demonstrate that P gingivalis ‐associated periodontitis worsens ischemic stroke outcome both indirectly by enhancing systemic and brain inflammation and directly via BBB disruption. These results highlight periodontitis as a modifiable risk factor and potential therapeutic target for improving stroke prognosis.

    ano.nymous@ccsd.cnrs.fr.invalid (Devy Diallo) 02 Jan 2026

    https://u-paris.hal.science/hal-05438464v1
  • [hal-05473549] Four nudivirus core genes present in the genome of Venturia canescens are required for virus-like particle formation and prevention of encapsulation of parasitoid wasp eggs

    ABSTRACT Venturia canescens is a parasitoid wasp that harbors a domesticated endogenous virus (DEV) and parasitizes host insects like Ephestia kuehniella . The V. canescens DEV evolved from an alphanudivirus and produces virus-like particles (VLPs) in females that protect wasp eggs from a host immune defense called encapsulation. In contrast, very few DEV genes required for VLP formation and function have been identified. In this study, we characterized five V. canescens DEV genes of unknown function that all nudiviruses encode. Three of these genes are single copy ( OrNVorf18-like , OrNVorf61-like , and OrNVorf76-like ), while OrNVorf41-like has expanded into a six-member family and OrNVorf47-like has expanded into a three-member family. Sequence analysis indicated all of these genes retain essential motifs present in nudivirus homologs, while transmission electron microscopy (TEM) studies characterized the timing of VLP formation during the wasp pupal stage. RNA interference (RNAi) assays identified OrNVorf18-like , OrNVorf61-like , OrNVorf41-like-1, and OrNVorf41-like-2 as genes that are required for normal VLP formation. Knockdown of OrNVorf47-like family members did not affect VLP formation but did disable binding of VLPs to V. canescens eggs and protection against encapsulation. Disabled formation of VLPs in response to RNAi knockdown of OrNVorf18-like , OrNVorf61-like , OrNVorf41-like-1, and OrNVorf41-like-2 also resulted in wasp eggs being encapsulated. In contrast, knockdown of OrNVorf76-like had no effect on VLP assembly, egg binding, or encapsulation. Altogether, reported results significantly advance our understanding of V. canescens VLP (VcVLP) formation and function. IMPORTANCE Understanding how V. canescens coopted an alphanudivirus to produce VcVLPs is of interest to the study of virus evolution. Our results show that three nudivirus core genes have essential functions in VcVLP formation, while one is essential for the novel function of binding to wasp eggs and protection from encapsulation, which is the most important immune defense of insects against parasitoids.

    ano.nymous@ccsd.cnrs.fr.invalid (Meng Mao) 23 Jan 2026

    https://hal.science/hal-05473549v1

Actualités

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article

15 janvier 2026

Rédaction : A-N. Volkoff, N. Nègre, I. Seninet

On recrute à DGIMI en 2026

Meilleurs vœux pour cette nouvelle année 2026 ! Afin de vous accompagner dans votre épanouissement professionnel, le laboratoire DGIMI vous propose des offres de recrutement au niveau technicien, assistant-ingénieur, enseignant-chercheur et chercheur :
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Sigle INRAe
12 01

12 janvier 2026

UMR DGIMI, Université de Montpellier, campus sciences

Un poste de technicien.ne est ouvert dans notre unité !

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Il/Elle assurera le maintien d'élevages d'insectes au sein de l'insectarium DGIMI, contribuera aux collectes d’insectes et de nématodes sur le terrain ainsi qu’à leur maintien temporaire au laboratoire, et il/elle sera amené.e à participer à des expérimentations sur insectes, selon les besoins des projets de recherche en cours.

Sigle INRAe
12 01

12 janvier 2026

UMR DGIMI, Université de Montpellier, campus sciences

Un poste de Maître de Conférences est à pourvoir en septembre 2026

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à l'Université de Montpellier.

Sigle INRAe

On recrute un.e chercheur.se

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Nous recherchons tout particulièrement à renforcer notre expertise sur le rôle des éléments transposables (ET) ou des éléments viraux endogènes (EVE) dans l’évolution et l’adaptation des génomes d’insectes.