Morphological Aspects of Symbiosis

Nardon, P.; Charles, Hubert

doi:10.1007/0-306-48173-1_2

Cited by 13 publications

(14 citation statements)

References 105 publications

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“…As the mysid associate remains external and was never found in another habitat in Arcachon Bay, the association between H. microps and U. pusilla may be classified as obligatory ectocommensalism (Nardon and Charles, 2002;San Vicente and Monniot, 2014). H. microps seems to take advantage of the filter feeding and the gardening behaviour of U. pusilla.…”

Section: Discussionmentioning

confidence: 99%

Heteromysis (Heteromysis) microps (Crustacea, Mysidae), a commensal species for Upogebia pusilla (Crustacea, Upogebiidae) in Arcachon Bay (NE Atlantic Ocean)

et al. 2016

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Background: The mysid Heteromysis (Heteromysis) microps is reported for the first time in the Bay of Biscay. During surveys carried out between March and September 2015 in Arcachon Bay, mysid specimens were fortuitously collected from Upogebia pusilla burrows. Results: Details on morphology, colour pattern and behaviour of H. microps are provided.Conclusions: Commensalism was frequently mentioned for Heteromysis species but never reported for H. microps. In this study, commensalism seems to be proved between the mysid and its host U. pusilla.

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Section: Discussionmentioning

confidence: 99%

Heteromysis (Heteromysis) microps (Crustacea, Mysidae), a commensal species for Upogebia pusilla (Crustacea, Upogebiidae) in Arcachon Bay (NE Atlantic Ocean)

et al. 2016

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“…The primordium gives rise to the mature nodule, in which meristem, invasion, infected and degenerative zones occur. The bacteria are released (but are always surrounded by the host plasma membrane) in the invasion zone, in cells which elongate and increase in size while bacteria proliferate and differentiate into the active form (bacterioids) (Nardon and Charles 2002). In pea, the genes controlling nodule morphogenesis have been identified for plant tissue colonization and differentiation of bacteria into bacterioids and for the development of nodule tissue (Borisov et al 2007).…”

Section: Legume Nodulesmentioning

confidence: 98%

Plant root growth, architecture and function

Hodge¹,

Berta²,

Doussan³

et al. 2009

Plant Soil

623

400

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Without roots there would be no rhizosphere and no rhizodeposition to fuel microbial activity. Although micro-organisms may view roots merely as a source of carbon supply this belies the fascinating complexity and diversity of root systems that occurs despite their common function. Here, we examine the physiological and genetic determinants of root growth and the complex, yet varied and flexible, root architecture that results. The main functions of root systems are also explored including how roots cope with nutrient acquisition from the heterogeneous soil environment and their ability to form mutualistic associations with key soil microorganisms (such as nitrogen fixing bacteria and mycorrhizal fungi) to aid them in their quest for nutrients. Finally, some key biotic and abiotic constraints on root development and function in the soil environment are examined and some of the adaptations roots have evolved to counter such stresses discussed.Keywords Root systems . Auxin . Root architecture . Soil heterogeneity . Abiotic and biotic stresses . Soil micro-organisms (including nitrogen-fixing bacteria and mycorrhizal fungi)Physiological and genetic determinants of root growth and achitecture A major difference between plant and animal development is that positional information rather than cell lineage determines cell fate in plants (Singh and Bhalla 2006). Post-embryonically, plant development is essentially driven by stem cells localized in apical regions of shoots and roots, and referred to as apical meristems. This particular characteristic allows plants, Plant Soil (

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“…Ce sont des bactéries intracellulaires, qu'on doit désigner par le terme d' « endocytobiotes », si l'on veut être plus précis (Nardon & Charles 2001). Chez Sitophilus oryzae, SOPE est le symbiote principal : c'est une γ 3 -protéobactérie intracellulaire (endocytobiote) Lefèvre et al 2004).…”

Section: Les Symbiotesunclassified

Ovogenèse et transmission des bactéries symbiotiques chez le charançonSitophilus oryzaeL. (Coleoptera: Curculionoidea)

Nardon

2006

Annales de la Société entomologique de France (N.S.)

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Ovogenèse et transmission des bactéries symbiotiques chez le charançon Sitophilus oryzae L. (Coleoptera: Curculionoidea)Summary. Oogenesis and transmission of symbiotic bacteria in the weevil Sitophilus oryzae L. (Coleoptera: Dryophthoridae). Among Coleoptera, and particularly in numerous Dryophthoridae, the insects share intracellular symbiosis with hereditary Gram-negative bacteria (or endocytobiotes). Sitophilus oryzae Primary Endosymbiote (SOPE) belongs to the γ3-proteobacteria group. It is a pleomorphic rod shaped (1 to 30 µm ), non-sporulating and non-ciliated bacterium. In the bacteriocyte the bacteria are not included in vacuoles but lie freely in the cytoplasm. SOPE is closely related to Escherichia coli, with 95% homology on the 16S rDNA gene, and also the primary endosymbiotes of Sitophilus zeamais (97,8% identity). In addition to SOPE, several wild strains of S. oryzae harbor a second symbiotic bacterium, that belongs to the B-group of Wolbachia (an α-proteobacterium). They are not considered in this work since studied strains were deprived of Wolbachia. Previous studies have shown that SOPE is transmitted to the offspring strictly through the female. The bacteria are located in ovaries and in the larval bacteriome. The latter organ is at the junction stomodeummidgut, and does not communicate with the gut lumen. It is dissociated at metamorphosis. This work aims to better describe oogenesis in the weevil Sitophilus oryzae and some other Coleoptera. It was performed with various techniques, some of them being original in histology and histochemistry (BMN fixative, RPH and RPMy). Autoradiographic studies were used to precise the nucleic acid (DNA, RNA) and protein metabolism, in the different cell types of the ovary, and in the symbiotic bacteria. In the adult females, the ovarioles are surrounded with a Tunica propria and a double sheath of flat cells, which present a ribonucleo-proteic metabolism. In the apical bacteriome the bacteriocytes are giant polyploid cells. They contain numerous symbiotic bacteria and exhibit a low cellular activity although they do multiply. They also show a lytic activity with myelinic degeneration figures. Between the bacteriocytes small interstitial cells can be seen. These small cells are also visible between the trophocytes in the tropharium. The trophocytes, or nurse cells, are polyploid and form a pseudosyncitium like. They harbor numerous symbiotes and mitochondria. The chromosoma are apparently at the end of pachytene or at diplotene stages. In opposition to most other telotrophic insects, the nutritive cords are poorly developped in S. oryzae. Despite an intense metabolism of RNA and proteins, no transfer of these substances to oocytes was seen. The oogenesis is accomplished in 8 serial steps, with the two first stages occurring in the nymph. The stage 1 includes oogonia and the stage 2 begins at the first step of meiosis and ends at pachytene. SOPE are rarely visible. At the stage 3 oocytes are found among the prefollicular tissue, at the basis of tropharium (3A)...

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Morphological Aspects of Symbiosis

Cited by 13 publications

References 105 publications

Heteromysis (Heteromysis) microps (Crustacea, Mysidae), a commensal species for Upogebia pusilla (Crustacea, Upogebiidae) in Arcachon Bay (NE Atlantic Ocean)

Heteromysis (Heteromysis) microps (Crustacea, Mysidae), a commensal species for Upogebia pusilla (Crustacea, Upogebiidae) in Arcachon Bay (NE Atlantic Ocean)

Plant root growth, architecture and function

Ovogenèse et transmission des bactéries symbiotiques chez le charançonSitophilus oryzaeL. (Coleoptera: Curculionoidea)

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