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Assobhi B, Bouchelta Y, Alsubih M, LamiaTrabelsi, Alaoui-Sossé B, Bourgeade P, Aleya L, Mhamdi MA, Bahhou J. What are the growth kinetics and biochemical compositions of microalgae isolated from diverse aquatic ecosystems in Morocco, France, and Tunisia? Environ Sci Pollut Res Int 2024:10.1007/s11356-024-33412-9. [PMID: 38662296 DOI: 10.1007/s11356-024-33412-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2023] [Accepted: 04/17/2024] [Indexed: 04/26/2024]
Abstract
Thirty-six microalgae belonging to five taxonomic groups (Cyanobacteria, Chlorophyceae, Diatomophyceae, Euglenophyceae, and Eustigmatophyceae) were identified from six freshwater ecosystems in Morocco, two treatment stations in Etueffont landfill in France and three hot spring waters in Tunisia. Investigations on species growth kinetics and growth rates showed that the cyanobacterium Leptolyngbya gelatinosa exhibited both the highest biomass and growth rate with 4 g DW L-1 and 0.282 day-1, respectively. A significant protein production (more than 40% DW) was observed across the studied species. Cyanobacteria and chlorophytes stood out for their increased protein production with a maximum (66.63 ± 3.84% DW) attained by the cyanobacterium Leptolyngbya sp. Chlorophytes produced substantial amounts of carbohydrates (more than 20% DW). Euglenophytes including Phacus orbicularis and Euglena ehrenbergii along with the chlorophyte Graesiella sp. accumulated significant amounts of lipids (up to 31.12% DW).
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Affiliation(s)
- Bouchra Assobhi
- Faculty of Sciences Dhar El Mahraz, Laboratory of Biotechnology, Conservation and Valorization of Natural Resources, Sidi Mohammed Ben Abdellah University of Fez, P.O. Box 1796, Atlas-, Fez, Morocco
| | - Yamina Bouchelta
- Faculty of Sciences Dhar El Mahraz, Laboratory of Biotechnology, Conservation and Valorization of Natural Resources, Sidi Mohammed Ben Abdellah University of Fez, P.O. Box 1796, Atlas-, Fez, Morocco
| | - Majed Alsubih
- Department of Civil Engineering, King Khalid University, Guraiger, Abha, 62529, Kingdom of Saudi Arabia
| | - LamiaTrabelsi
- Marine Biodiversity Laboratory, National Institute of Marine Sciences and Technology (INSTM), 2025 Salammbo, University of Carthage, Tunis, Tunisia.
| | - Badr Alaoui-Sossé
- Laboratoire de Chrono-Environnement, UMR CNRS 6249, Université de Bourgogne Franche-Comté, La Bouloie, F-25030, Besançon Cedex, France
| | - Pascale Bourgeade
- Laboratoire de Chrono-Environnement, UMR CNRS 6249, Université de Bourgogne Franche-Comté, La Bouloie, F-25030, Besançon Cedex, France
| | - Lotfi Aleya
- Laboratoire de Chrono-Environnement, UMR CNRS 6249, Université de Bourgogne Franche-Comté, La Bouloie, F-25030, Besançon Cedex, France
| | - Mohammed Alaoui Mhamdi
- Faculty of Sciences Dhar El Mahraz, Laboratory of Biotechnology, Conservation and Valorization of Natural Resources, Sidi Mohammed Ben Abdellah University of Fez, P.O. Box 1796, Atlas-, Fez, Morocco
| | - Jamila Bahhou
- Faculty of Sciences Dhar El Mahraz, Laboratory of Biotechnology, Conservation and Valorization of Natural Resources, Sidi Mohammed Ben Abdellah University of Fez, P.O. Box 1796, Atlas-, Fez, Morocco
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Kandory A, Goncalves AM, Frégnaux M, Cattey H, Alaoui-Sossé B, Aleya L, Herlem G. Gold modification by reduction of a diazonium salt prepared from an aliphatic diamine: a new useful means to remove hazardous substances. Environ Sci Pollut Res Int 2022; 29:1239-1245. [PMID: 34350575 DOI: 10.1007/s11356-021-15696-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Accepted: 07/23/2021] [Indexed: 06/13/2023]
Abstract
We studied the electrochemical reduction based on gold electrode of a diazonium salt prepared from ethylenediamine. This is the first time where the covalent functionalization on the gold electrode of an alkyldiazonium salt, 2-aminoethane-1-diazonium chloride, is demonstrated. This step requires the preparation beforehand by diazotization of one amine group from ethylenediamine. The resulting electrodeposited ethylamine film was confirmed by spectroscopic characterizations from gold surface modification monitored by electrochemical quartz crystal microbalance (EQCM) coupled to cyclic voltammetry (CV). The development of chemosensors based on such a covalent functionalization of a metal can reduce the chemical threats to human health along with drastically removing contaminants according to the green chemistry principles.
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Affiliation(s)
- Ahmed Kandory
- Laboratoire de Nanomédecine, Imagerie et Thérapeutique EA 4662, UFR Sciences & Techniques, CHU J. Minjoz, Université de Franche-Comté, cedex, 25030, Besançon, France
- Department of Chemistry, College of Science, University of Diyala, Baqubah, Iraq
| | - Anne-Marie Goncalves
- Institut Lavoisier, UMR CNRS 8180, 45 av. Des Etats-Unis, cedex, 78035, Versailles, France
| | - Mathieu Frégnaux
- Institut Lavoisier, UMR CNRS 8180, 45 av. Des Etats-Unis, cedex, 78035, Versailles, France
| | - Hélène Cattey
- Institut ICMUB - CNRS 6302, Université de Bourgogne, UFR Sciences et Techniques Mirande, 9 Avenue Alain Savary, 21000, Dijon, France
| | - Badr Alaoui-Sossé
- CNRS 6249-Université de Franche-Comté, 16, route de Gray, F-25030, Besançon cedex, France
| | - Lotfi Aleya
- CNRS 6249-Université de Franche-Comté, 16, route de Gray, F-25030, Besançon cedex, France.
| | - Guillaume Herlem
- Laboratoire de Nanomédecine, Imagerie et Thérapeutique EA 4662, UFR Sciences & Techniques, CHU J. Minjoz, Université de Franche-Comté, cedex, 25030, Besançon, France
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Pfendler S, Einhorn O, Alaoui-Sossé L, Bousta F, Alaoui-Sossé B, Aleya L. Factors inducing bryophyte growth on prehistoric pigments and effect of UV-C treatment. Environ Sci Pollut Res Int 2021; 28:2987-2994. [PMID: 32901409 DOI: 10.1007/s11356-020-10681-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Accepted: 08/30/2020] [Indexed: 06/11/2023]
Abstract
In La Glacière cave (France), the touristic activity has been conducted to an environmental parameter change that has led to photosynthetic organism proliferation (microalgae, diatoms, cyanobacteria, bryophytes). The present study is focused on bryophyte development occurring in the show cave that was responsible of limestone biodeterioration. In order to understand the colonization process of limestone, we have maintained limestone blocks under optimal Lampenflora growth conditions. Moreover, some limestone blocks were painted with several pigments that were used in the prehistory (e.g., red ocher, bone char). Microorganisms and bryophyte growth were monitored during 1 year, and then, the block samples were treated using UV-C light (254 nm). Thus, obtained results were compared with in situ treatment in La Glacière cave. Results have showed dense bryophyte propagation on the several blocks. However, the growth rate was correlated with the chemical composition of the pigment. In fact, the presence of some chemical elements such as As, Cr, Ti, and Co contributed to reduce bryophyte growth. Finally, moss treatment using UV-C light has demonstrated high efficiency under in situ condition, while a fast recolonization has been observed for samples maintained in laboratory. This difference was explained by the high bryophyte density under laboratory conditions that make UV-C light penetration difficult.
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Affiliation(s)
- Stéphane Pfendler
- University of Lyon, UJM-Saint-Etienne, CNRS, EVS-ISTHME UMR 5600, F-42023, Saint-Etienne, France.
| | - Olympe Einhorn
- Laboratoire Chrono-Environnement - UMR 6249, Université de Bourgogne Franche-Comté, 16, route de Gray, 25 000, Besançon, France
| | - Laurence Alaoui-Sossé
- Laboratoire Chrono-Environnement - UMR 6249, Université de Bourgogne Franche-Comté, 16, route de Gray, 25 000, Besançon, France
| | - Faisl Bousta
- Laboratoire de Recherche des Monuments Historiques, USR 3224, Champs-Sur-Marne, France
| | - Badr Alaoui-Sossé
- Laboratoire Chrono-Environnement - UMR 6249, Université de Bourgogne Franche-Comté, 16, route de Gray, 25 000, Besançon, France
| | - Lotfi Aleya
- Laboratoire Chrono-Environnement - UMR 6249, Université de Bourgogne Franche-Comté, 16, route de Gray, 25 000, Besançon, France
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Bourioug M, Ezzaza K, Bouabid R, Alaoui-Mhamdi M, Bungau S, Bourgeade P, Alaoui-Sossé L, Alaoui-Sossé B, Aleya L. Influence of hydro- and osmo-priming on sunflower seeds to break dormancy and improve crop performance under water stress. Environ Sci Pollut Res Int 2020; 27:13215-13226. [PMID: 32016860 DOI: 10.1007/s11356-020-07893-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Accepted: 01/27/2020] [Indexed: 06/10/2023]
Abstract
This study explored the effects of two hydro- and osmo-priming durations (8 and 16 h) on growth and yield components of sunflowers (Helianthus annuus L.) under water stress. The pot experiment, performed under a rain shelter, consisted of 9 treatments replicated five times: unprimed seeds as control (C), hydro-primed seeds (T0), osmo-primed seeds in 10, 20, and 30% PEG-6000 (T1, T2, and T3, respectively). Severe water stress was applied for 12 days to all treatments at the beginning of the flowering stage. Statistical analysis revealed a very highly significant positive effect (p < 0.01) by all treatments on sunflower seed germination compared with the control. Moreover, primed seeds improved significantly for all growth parameters and yield components, but no significant differences were observed according to either priming technique or duration. The highest value of germination capacity, for fresh and dry biomasses, was obtained with PEG-primed seeds at 10% for 16 h. The grain number per anthodium and grain yield per plant from primed seeds were higher than those in the control (1.9- to 2.5-fold and 2.8- to 3.3-fold respectively). Under conditions of water stress, the proline content in primed plants was significantly higher than that in unprimed ones, with the exception of T3 treatment primed for 8 h. Soluble sugars and chlorophyll contents increased significantly with all applied treatments compared with the control. The study showed that the applied priming treatments improved germination characteristics in particular and increased growth and yield components for sunflowers under drought stress conditions.
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Affiliation(s)
- Mohamed Bourioug
- Département d'Agronomie et d'Amélioration des Plantes, Ecole Nationale d'Agriculture de Meknès, km. 10, Route Haj Kaddour, B.P. S/40, 50001, Meknès, Morocco
| | - Kaoutar Ezzaza
- Département d'Agronomie et d'Amélioration des Plantes, Ecole Nationale d'Agriculture de Meknès, km. 10, Route Haj Kaddour, B.P. S/40, 50001, Meknès, Morocco
| | - Rachid Bouabid
- Département d'Agronomie et d'Amélioration des Plantes, Ecole Nationale d'Agriculture de Meknès, km. 10, Route Haj Kaddour, B.P. S/40, 50001, Meknès, Morocco
| | - Mohammed Alaoui-Mhamdi
- Laboratoire d'analyse et modélisation des écosystèmes continentaux, Département de Biologie, Faculté des Sciences Dhar El Mahraz, Université Sidi Mohammed Ben Abdellah, B.P. 1796, 3003, Fez, Morocco
| | - Simona Bungau
- Department of Pharmacy, University of Oradea, 410028, Oradea, Romania
| | - Pascale Bourgeade
- Laboratoire Chrono-Environnement, UMR CNRS 6249, Université de Bourgogne Franche-Comté, 25030, Besançon, France
| | - Laurence Alaoui-Sossé
- Laboratoire Chrono-Environnement, UMR CNRS 6249, Université de Bourgogne Franche-Comté, 25030, Besançon, France
| | - Badr Alaoui-Sossé
- Laboratoire Chrono-Environnement, UMR CNRS 6249, Université de Bourgogne Franche-Comté, 25030, Besançon, France
| | - Lotfi Aleya
- Laboratoire Chrono-Environnement, UMR CNRS 6249, Université de Bourgogne Franche-Comté, 25030, Besançon, France.
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Saleh SR, Kandeel MM, Ghareeb D, Ghoneim TM, Talha NI, Alaoui-Sossé B, Aleya L, Abdel-Daim MM. Wheat biological responses to stress caused by cadmium, nickel and lead. Sci Total Environ 2020; 706:136013. [PMID: 31865000 DOI: 10.1016/j.scitotenv.2019.136013] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Revised: 12/06/2019] [Accepted: 12/06/2019] [Indexed: 06/10/2023]
Abstract
Several stressors like different types of heavy metals are found in the soil and can affect the growth and genomic integrity of wheat grains (Triticum aestivum L.). The aim of this study was to compare the effect of exogenous Cd (30, 60, 120 mg kg-1), Ni (50, 100 and 150 mg kg-1) or Pb (100, 200 and 300 mg kg-1) on wheat agronomic characteristics through the assessment of oxidative stress indices at protein and gene expression levels, photosynthetic pigments and genetic aberrations using RAPD analysis that were studied during two winter seasons (2015/2016 and 2016/2017). The results showed that all stressors significantly decreased the vegetative growth parameters, altered the activities of antioxidants enzymes in seedlings (after 30 days) and grains (after 5 months) and differently affected their expression levels in seedlings leaves and roots. Pb treated plants showed the poorest agronomic characteristics as it exhibited the worst affected wheat height, number of tillers, fresh and dry weight, flag leaf area as well as yield. Pb treatment caused poorest plant performance, it showed the highest proline content, least protein and chlorophyll contents, thus affects the overall plants growth followed by Cd and Ni, respectively. Furthermore, high Pb and Cd doses revealed highest degree of polymorphism and lowest degree of genome stability. Altogether, heavy metals accumulated mainly in wheat straw and induced genotoxic effect which consequently altered normal plant metabolism and pigment content which resulted in a significant reduction in wheat yield and quality. Moreover, Pb induced more genotoxic and phytotoxic effects than Cd and Ni.
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Affiliation(s)
- Samar R Saleh
- Biological screening and preclinical trial laboratory, Department of Biochemistry, Faculty of Science, Alexandria University, Alexandria, Egypt; Department of Biochemistry, Faculty of Science, Alexandria University, Alexandria, Egypt; Pharmaceutical and Fermentation Industries Development Centre, City for Scientific Research and Technology Applications, Alexandria, Egypt
| | - Marwa Masoud Kandeel
- Soil, Water and Environment Research Institute, Agricultural research center, Giza, Egypt
| | - Doaa Ghareeb
- Biological screening and preclinical trial laboratory, Department of Biochemistry, Faculty of Science, Alexandria University, Alexandria, Egypt; Department of Biochemistry, Faculty of Science, Alexandria University, Alexandria, Egypt; Pharmaceutical and Fermentation Industries Development Centre, City for Scientific Research and Technology Applications, Alexandria, Egypt
| | - Tayssir M Ghoneim
- Department of Biochemistry, Faculty of Science, Alexandria University, Alexandria, Egypt
| | - Nasser I Talha
- Soil, Water and Environment Research Institute, Agricultural research center, Giza, Egypt
| | - Badr Alaoui-Sossé
- Chrono-Environnement Laboratory, UMR CNRS 6249, Bourgogne Franche-Comté University, F-25030, Besançon Cedex, France
| | - Lotfi Aleya
- Chrono-Environnement Laboratory, UMR CNRS 6249, Bourgogne Franche-Comté University, F-25030, Besançon Cedex, France.
| | - Mohamed M Abdel-Daim
- Department of Zoology, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia; Pharmacology Department, Faculty of Veterinary Medicine, Suez Canal University, Ismailia 41522, Egypt
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Pfendler S, Karimi B, Alaoui-Sosse L, Bousta F, Alaoui-Sossé B, Abdel-Daim MM, Aleya L. Assessment of fungi proliferation and diversity in cultural heritage: Reactions to UV-C treatment. Sci Total Environ 2019; 647:905-913. [PMID: 30096678 DOI: 10.1016/j.scitotenv.2018.08.089] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2018] [Revised: 08/05/2018] [Accepted: 08/06/2018] [Indexed: 06/08/2023]
Abstract
Fungi are present in natural and non-touristic caves due to the presence of organic matter provided mainly by insects or animals such as bats. In show caves, however, tourist infrastructure and the visitors themselves are an important source of organic matter. In addition, photosynthetic biofilms provide a high amount of carbon and nitrogen sources for fungi. This study was conducted to identify the fungal communities present in caves along with the potential use of UV-C treatment against their proliferation. Thus, fungal communities proliferating in biofilms in six French and Swiss show caves were analyzed using high throughput sequencing. The results show 385 species recorded, some of them previously described in cases of fungal outbreak. This preliminary study also aimed to test the use of UV-C light as an environmentally friendly method to treat fungal proliferation. Six fungal strains, from three different sources (Lascaux cave, La Glacière cave, a church in Vicherey, France), were cultivated in an agar dish. Spores, mycelia and the entire colony were irradiated using several UV-C intensities. Results showed that four of the six fungi spores and mycelium died following a low-intensity UV-C treatment (2 kJ m-2, 160 s), though Ochroconis lascauxensis and Penicillium bilaiae spores showed higher resistance. Finally, it was demonstrated that the fungal colony could resist the UV-C light due to a shadow effect. The structure of the fungal colony was affected from the periphery to its inner part. However, after four 30 kJ m-2 treatments (39 min irradiation) all strains there definitively eradicated. Further studies will be necessary to examine the potential of UV-C light under cave conditions as a preventive and curative treatment.
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Affiliation(s)
- Stéphane Pfendler
- Laboratoire Chrono-Environnement - UMR 6249, Université de Bourgogne Franche-Comté, 16, route de Gray, 25 000 Besançon, France
| | - Battle Karimi
- Agroécologie, AgroSup Dijon, INRA, Université de Bourgogne Franche-Comté, F-21000 Dijon, France
| | - Laurence Alaoui-Sosse
- Laboratoire Chrono-Environnement - UMR 6249, Université de Bourgogne Franche-Comté, 16, route de Gray, 25 000 Besançon, France
| | - Faisl Bousta
- Laboratoire de Recherche des Monuments Historiques - USR 3224, Champs-Sur-Marne, France
| | - Badr Alaoui-Sossé
- Laboratoire Chrono-Environnement - UMR 6249, Université de Bourgogne Franche-Comté, 16, route de Gray, 25 000 Besançon, France
| | - Mohamed M Abdel-Daim
- Yokohama City University Medical Center, 4-57 Urafune-cho, Minami-ku Yokohama, Kanagawa-ken 232-0024, Japan
| | - Lotfi Aleya
- Laboratoire Chrono-Environnement - UMR 6249, Université de Bourgogne Franche-Comté, 16, route de Gray, 25 000 Besançon, France.
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Alaoui-Sossé B, Bourioug M, Benbrahim M, Carnus JM, Clert S, Bourgeade P, Aleya L. Influence of different sludge compositions on understorey vegetation in an amended Pinus pinatser forest plantation. Sci Total Environ 2018; 640-641:1082-1087. [PMID: 30021273 DOI: 10.1016/j.scitotenv.2018.05.371] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Revised: 05/27/2018] [Accepted: 05/29/2018] [Indexed: 06/08/2023]
Abstract
The present study reports on the influence of sludge application on understory abundance and species richness in an eight year-old maritime pine forest. Four types of sludge (liquid, dewatered, limed and composted sludge) were applied at a rate equivalent to 3 tons dry weight per ha-1 per year-1. Understorey vegetation was monitored before treatment and for three successive years following initial sludge application. Species richness, the biodiversity index and naturally occurring plant community cover in maritime pine forests were measured. Results showed a significant increase in species richness two years following initial sludge application. In fact, compared to the unamended plot, eighteen additional species (Aira caryophyllea, Cerastium glomeratum, Conyza canadensis, Danthonia decumbens, Geranium robertianum, Gnaphalium sylvaticum, Hypericum humifusum, Hypericum perforatum ssp. perforatum, Jasione montana, Lonicera periclymenum ssp. periclymenum, Ornithopus compressus, Phytolacca americana, Rhamnus frangula, Teesdalia nudicaulis, Veronica arvensis, Vicia sativa angustifolia and Vulpia myuros) appeared after sludge application. Most of these species were observed with the solid limed or composted sludge treatments. The new species then declined the following year, highlighting the temporary effect of sludge treatment on species diversity. However, the cover by these eighteen new species was low and did not exceed 1%, except for Hypericum perforatum and Jasione montana for the limed sludge treatment and Vulpia myuros for the liquid sludge treatment. Additionally, sludge significantly reduces bare soil percentage, which ranged from 5 to 18% compared to the control (38%). According to sludge type, treatment also led to a significant change in species dominance of the understorey plant communities. Indeed, the cover of Molinia caerulea decreased in spite of an increase in Agrostis capillaris and/or Holcus lanatus following application of solid limed, liquid or composted sludge.
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Affiliation(s)
- Badr Alaoui-Sossé
- Laboratoire Chrono-Environnement, UMR CNRS 6249, Université de Franche-Comté, F-25030 Besançon, France
| | - Mohamed Bourioug
- Départment d'Agronomie et d'Amélioration des Plantes, Ecole Nationale d'Agriculture de Meknès, km. 10, Route Haj Kaddour, B.P. S/40, 50001 Meknès, Morocco
| | - Mohammed Benbrahim
- RITTMO Agroenvironnement, ZA Biopôle, 37 rue de Herrlisheim, CS 80023, F-68025 Colmar Cedex, France
| | - Jean-Michel Carnus
- INRA, Unité de Recherches Forestières U 911, Domaine de l'Hermitage, Route d'Arcachon, 33610 Cestas, France
| | - Sébastien Clert
- INRA, Unité de Recherches Forestières U 911, Domaine de l'Hermitage, Route d'Arcachon, 33610 Cestas, France
| | - Pascale Bourgeade
- Laboratoire Chrono-Environnement, UMR CNRS 6249, Université de Franche-Comté, F-25030 Besançon, France
| | - Lotfi Aleya
- Laboratoire Chrono-Environnement, UMR CNRS 6249, Université de Franche-Comté, F-25030 Besançon, France.
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Laffray X, Alaoui-Sehmer L, Bourioug M, Bourgeade P, Alaoui-Sossé B, Aleya L. Effects of sodium chloride salinity on ecophysiological and biochemical parameters of oak seedlings (Quercus robur L.) from use of de-icing salts for winter road maintenance. Environ Monit Assess 2018; 190:266. [PMID: 29619577 DOI: 10.1007/s10661-018-6645-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2018] [Accepted: 03/26/2018] [Indexed: 06/08/2023]
Abstract
Salt is widely used to melt snow on roads especially in mountain regions. Whether as rock salt or aerosols, spread or sprayed over road surfaces, salt may result in increased salt concentrations in soils, which, in turn, affect natural vegetation, especially tree seedlings already subjected to various other types of abiotic stress. The authors investigated the effects of salt treatment-related stress on seedling growth and certain biochemical parameters in Quercus robur to determine ion concentrations in root tips. Seedlings growing in a quartz sand/vermiculite mixture were subjected to NaCl concentrations of 0, 50, or 100 mM for 5 weeks. The results showed that high NaCl concentrations caused a marked reduction in total leaf biomass 55 and 75% for 50 and 100 mM treatments, respectively, in dry weight of stems (84%) and roots (175%) for 100 mM treatment and modified root architecture, whereas no changes appeared in leaf number. A non-significant decrease in relative water content, with changes in ion balance was recorded. Comparison of stressed to control plants show an increase in sodium (3.5-8-fold), potassium (0.6-fold), and chloride (9.5-14-fold) concentrations in the root tips while the K+/Na+ ratio decreased. In taproots, no significant biochemical differences were observed between the salt-treated and the control plants for acid invertase activity, reducing sugars, sucrose, or soluble protein contents. The significance of ion and sugar accumulations in relation to osmotic adjustment and the ability of oak seedlings to cope with salt stress are discussed.
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Affiliation(s)
- Xavier Laffray
- Département Systématique et Evolution, Muséum National d'Histoire Naturelle, 75005, Paris, France
| | - Laurence Alaoui-Sehmer
- Laboratoire Chrono-Environnement, UMR CNRS 6249, University of Franche-Comté, F-25030, Besançon, France
| | - Mohamed Bourioug
- Département d'Agronomie, Ecole Nationale d'Agriculture de Meknès (ENAM), km 10, Route Haj Kaddour, B.P. S/40, 50001, Meknès, Morocco
| | - Pascale Bourgeade
- Laboratoire Chrono-Environnement, UMR CNRS 6249, University of Franche-Comté, F-25030, Besançon, France
| | - Badr Alaoui-Sossé
- Laboratoire Chrono-Environnement, UMR CNRS 6249, University of Franche-Comté, F-25030, Besançon, France
| | - Lotfi Aleya
- Laboratoire Chrono-Environnement, UMR CNRS 6249, University of Franche-Comté, F-25030, Besançon, France.
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Bourgeade P, Bourioug M, Macor S, Alaoui-Sossé L, Alaoui-Sossé B, Aleya L. Potential vulnerability of oak forests to climate change-induced flooding: effects of mild oxygen deficiency on Quercus robur and Quercus petraea seedling physiology. Environ Sci Pollut Res Int 2018; 25:5550-5557. [PMID: 29218580 DOI: 10.1007/s11356-017-0893-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Accepted: 11/30/2017] [Indexed: 06/07/2023]
Abstract
Flooding is characterized by saturation of soil pores with water, leading to hypoxic conditions which affect plant root development and metabolism. We investigated the oxygen deficiency tolerance observed in Quercus robur and Quercus petraea and seek to understand whether it can be explained by enhanced efficiency in oxygen use in the roots, as estimated through radial oxygen loss visualization in relation to growth measurements and root apex respiration. The study showed that root growth, under oxygen deficiency conditions, was significantly reduced only in Q. robur seedlings. Root respiration was maintained in Q. robur, whereas it was decreased in Q. petraea. Both species set up a barrier against radial oxygen loss, though measurement of apex oxygen leakage showed greater oxygen efficiency in Q. robur seedlings. This strategy might allow Q. robur to maintain its respiration and thus to survive longer under oxygen deficiency conditions by facilitating the seedling establishment in transient flooded soils.
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Affiliation(s)
- Pascale Bourgeade
- Chrono-Environnement Laboratory, UMR CNRS 6249, Bourgogne Franche-Comté University, F-25030, Besançon, France
| | - Mohamed Bourioug
- Department of Agronomy, National School of Agriculture, Km 10, Route Haj Kaddour, B.P. S/40, 50001, Meknès, Morocco
| | - Sandra Macor
- Chrono-Environnement Laboratory, UMR CNRS 6249, Bourgogne Franche-Comté University, F-25030, Besançon, France
| | - Laurence Alaoui-Sossé
- Chrono-Environnement Laboratory, UMR CNRS 6249, Bourgogne Franche-Comté University, F-25030, Besançon, France
| | - Badr Alaoui-Sossé
- Chrono-Environnement Laboratory, UMR CNRS 6249, Bourgogne Franche-Comté University, F-25030, Besançon, France
| | - Lotfi Aleya
- Chrono-Environnement Laboratory, UMR CNRS 6249, Bourgogne Franche-Comté University, F-25030, Besançon, France.
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10
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Pfendler S, Einhorn O, Bousta F, Khatyr A, Alaoui-Sossé L, Aleya L, Alaoui-Sossé B. UV-C as a means to combat biofilm proliferation on prehistoric paintings: evidence from laboratory experiments. Environ Sci Pollut Res Int 2017; 24:21601-21609. [PMID: 28752304 DOI: 10.1007/s11356-017-9791-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Accepted: 07/19/2017] [Indexed: 06/07/2023]
Abstract
A laboratory investigation of UV-C effects was conducted over a 62-h period: a much higher dose than in classic UV-C treatment was applied to five pigments and two painting binders used by prehistoric humans. Colorimetric parameters were compared to a control to see if UV-C can change pigment and binder color. Infrared spectroscopy, scanning electron microscopy, inductively coupled plasma and X-ray crystallography were also carried out to confirm colorimetric measurement. In order to understand how microorganism may physically deteriorate paintings, limestone blocks were painted and monitored until their complete colonization by algae, cyanobacteria, fungi and/or mosses. The results show that UV-C has no effect on mineral compounds. Conversely, it is noteworthy that binder color changed under both UV-C light conditions as well as in visible light. Concerning painted blocks, a fast proliferation has been observed with deterioration of the paintings. These results show the high importance of treating biofilm as soon as possible. Moreover, these findings may be a promising avenue inducing cave managers to use friendly UV-C light to treat contaminated cave paintings and also in the prevention of biodeterioration by lampenflora.
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Affiliation(s)
- Stéphane Pfendler
- Laboratoire Chrono-Environnement - UMR 6249, Université de Bourgogne Franche-Comté Besançon, Besançon, France
| | - Olympe Einhorn
- Laboratoire Chrono-Environnement - UMR 6249, Université de Bourgogne Franche-Comté Besançon, Besançon, France
| | - Faisl Bousta
- Laboratoire de Recherche des Monuments Historiques - USR 3224, Champs-Sur-Marne, France
| | - Abderrahim Khatyr
- Institut UTINAM UMR CNRS 6213, Université de Franche-Comté, Besançon, France
| | - Laurence Alaoui-Sossé
- Laboratoire Chrono-Environnement - UMR 6249, Université de Bourgogne Franche-Comté Besançon, Besançon, France
| | - Lotfi Aleya
- Laboratoire Chrono-Environnement - UMR 6249, Université de Bourgogne Franche-Comté Besançon, Besançon, France.
| | - Badr Alaoui-Sossé
- Laboratoire Chrono-Environnement - UMR 6249, Université de Bourgogne Franche-Comté Besançon, Besançon, France
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11
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Corbel S, Bourioug M, Alaoui-Sossé L, Bourgeade P, Alaoui-Sossé B, Aleya L. Effects of repeated soil irrigation with liquid biological paper sludge on poplar Populus alba saplings: potential risks and benefits. Environ Sci Pollut Res Int 2016; 23:21584-21593. [PMID: 27518398 DOI: 10.1007/s11356-016-7383-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2016] [Accepted: 08/02/2016] [Indexed: 06/06/2023]
Abstract
The authors explored the risks and benefits of repeated irrigation of Populus alba saplings with aqueous paper sludge (APS). Saplings were cultivated in pots of forest soil (3 L) in a greenhouse for 7 weeks and watered twice a week with differing concentrations of APS (0, 10, 20, 30, 50, 75, and 100 % v/v with deionized water). Plant growth and ecophysiological variables along with zinc and aluminum transfer were monitored. A stimulation of plant growth was observed with sludge treatments of 30 or 50 %, significantly correlated to APS input (r = 0.81). This may be explained by the easily available nitrogen as is shown with the positive correlation of CO2 assimilation and leaf nitrogen (r = 0.70). However, a significant reduction in plant growth was observed when treatments of 75 and 100 % of APS were administered, despite a high nutritional level (nitrogen and phosphorus). The study suggests that APS concentrations from 30 to 50 % may positively affect the growth of poplar saplings; however, the higher concentrations indicated a risk for plant growth and the environment.
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Affiliation(s)
- Sylvain Corbel
- Laboratoire Ecologie, Systématique et Evolution, UMR CNRS 8079, Université Paris-Sud, AgroParisTech, 91405, Orsay, France
| | - Mohamed Bourioug
- Department of Agronomy, National School of Agriculture, km. 10, Route Haj Kaddour, B.P. S/40, 50001, Meknès, Morocco
| | - Laurence Alaoui-Sossé
- Laboratoire Chrono Environnement, UMR CNRS 6249, Université de Bourgogne Franche-Comté, 25030, Besançon, France
| | - Pascale Bourgeade
- Laboratoire Chrono Environnement, UMR CNRS 6249, Université de Bourgogne Franche-Comté, 25030, Besançon, France
| | - Badr Alaoui-Sossé
- Laboratoire Chrono Environnement, UMR CNRS 6249, Université de Bourgogne Franche-Comté, 25030, Besançon, France
| | - Lotfi Aleya
- Laboratoire Chrono Environnement, UMR CNRS 6249, Université de Bourgogne Franche-Comté, 25030, Besançon, France.
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Borderie F, Denis M, Barani A, Alaoui-Sossé B, Aleya L. Microbial composition and ecological features of phototrophic biofilms proliferating in the Moidons Caves (France): investigation at the single-cell level. Environ Sci Pollut Res Int 2016; 23:12039-12049. [PMID: 26961535 DOI: 10.1007/s11356-016-6414-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Accepted: 03/02/2016] [Indexed: 06/05/2023]
Abstract
The authors investigated the microbial composition of phototrophic biofilms proliferating in a show cave using flow cytometry for the first time in such a context. Results are based on several biofilms sampled in the Moidons Caves (France) and concern both heterotrophic prokaryotes and autotrophic microorganisms. Heterotrophic microorganisms with low nucleic acid content were dominant in biofilms, as can be expected from the oligotrophic conditions prevailing within the cave. Analysis of the biofilm autotrophic components revealed the presence of several taxa, particularly the unicellular green algae Chlorella minutissima, specifically well adapted to this cave. Relationships between flow cytometry results and environmental variables determined in the cave were established and discussed so as to better understand biofilm proliferation processes in caves.
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Affiliation(s)
- Fabien Borderie
- Laboratoire Chrono-Environnement, UMR CNRS 6249, Université de Bourgogne Franche-Comté, 16 route de Gray, Besançon, 25030, France
| | - Michel Denis
- Institut Méditerranéen d'Océanologie (MIO), CNRS/INSU, IRD, Université d'Aix-Marseille, 163 avenue de Luminy, Case 901, Marseille, 13288 Cedex 09, France
| | - Aude Barani
- Institut Méditerranéen d'Océanologie (MIO), CNRS/INSU, IRD, Université d'Aix-Marseille, 163 avenue de Luminy, Case 901, Marseille, 13288 Cedex 09, France
| | - Badr Alaoui-Sossé
- Laboratoire Chrono-Environnement, UMR CNRS 6249, Université de Bourgogne Franche-Comté, 16 route de Gray, Besançon, 25030, France
| | - Lotfi Aleya
- Laboratoire Chrono-Environnement, UMR CNRS 6249, Université de Bourgogne Franche-Comté, 16 route de Gray, Besançon, 25030, France.
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Bourioug M, Gimbert F, Alaoui-Sehmer L, Benbrahim M, Badot PM, Alaoui-Sossé B, Aleya L. Effects of sewage sludge amendment on snail growth and trace metal transfer in the soil-plant-snail food chain. Environ Sci Pollut Res Int 2015; 22:17925-36. [PMID: 26165994 DOI: 10.1007/s11356-015-5006-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2014] [Accepted: 07/01/2015] [Indexed: 06/04/2023]
Abstract
Cu, Zn, Pb, and Cd concentrations in a soil plant (Lactuca sativa) continuum were measured after sewage sludge amendment. The effects of sewage sludge on growth and trace metal bioaccumulation in snails (Cantareus aspersus) were investigated in a laboratory experiment specifically designed to identify contamination sources (e.g., soil and leaves). Application of sewage sludge increased trace metal concentrations in topsoil. However, except Zn, metal concentrations in lettuce leaves did not reflect those in soil. Lettuce leaves were the main source of Zn, Cu, and Cd in exposed snails. Bioaccumulation of Pb suggested its immediate transfer to snails via the soil. No apparent toxic effects of trace metal accumulation were observed in snails. Moreover, snail growth was significantly stimulated at high rates of sludge application. This hormesis effect may be due to the enhanced nutritional content of lettuce leaves exposed to sewage sludge.
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Affiliation(s)
- Mohamed Bourioug
- Jean-François Champollion University Center for Teaching and Research, Place Verdun, F-81000, Albi, France
| | - Frédéric Gimbert
- Chrono-Environnement UMR CNRS 6249, University of Bourgogne Franche-Comté, 16 Route de Gray, F-25000, Besançon, France
| | - Laurence Alaoui-Sehmer
- Chrono-Environnement UMR CNRS 6249, University of Bourgogne Franche-Comté, 16 Route de Gray, F-25000, Besançon, France
| | - Mohammed Benbrahim
- RITTMO Agroenvironnement, ZA Biopôle, 37 rue de Herrlisheim, CS 80023, F-68025, Colmar cedex, France
| | - Pierre-Marie Badot
- Chrono-Environnement UMR CNRS 6249, University of Bourgogne Franche-Comté, 16 Route de Gray, F-25000, Besançon, France
| | - Badr Alaoui-Sossé
- Chrono-Environnement UMR CNRS 6249, University of Bourgogne Franche-Comté, 16 Route de Gray, F-25000, Besançon, France
| | - Lotfi Aleya
- Chrono-Environnement UMR CNRS 6249, University of Bourgogne Franche-Comté, 16 Route de Gray, F-25000, Besançon, France.
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14
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Borderie F, Alaoui-Sossé B, Aleya L. Heritage materials and biofouling mitigation through UV-C irradiation in show caves: state-of-the-art practices and future challenges. Environ Sci Pollut Res Int 2015; 22:4144-4172. [PMID: 25548019 DOI: 10.1007/s11356-014-4001-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2014] [Accepted: 12/12/2014] [Indexed: 06/04/2023]
Abstract
Biofouling, i.e., colonization of a given substrate by living organisms, has frequently been reported for heritage materials and particularly on stone surfaces such as building facades, historical monuments, and artworks. This also concerns subterranean environments such as show caves, in which the installation of artificial light for tourism has led to the proliferation of phototrophic microorganisms. In Europe nowadays, the use of chemicals in these very sensitive environments is scrutinized and regulated by the European Union. New and environmentally friendly processes must be developed as alternative methods for cave conservation. For several years, the UV irradiation currently used in medical facilities and for the treatment of drinking water has been studied as a new innovative method for the conservation of heritage materials. This paper first presents a review of the biofouling phenomena on stone materials such as building facades and historical monuments. The biological disturbances induced by tourist activity in show caves are then examined, with special attention given to the methods and means to combat them. Thirdly, a general overview is given of the effects of UV-C on living organisms, and especially on photosynthetic microorganisms, through different contexts and studies. Finally, the authors' own experiments and findings are presented concerning the study and use of UV-C irradiation to combat algal proliferation in show caves. Both laboratory and in situ results are summarized and synthesized from their previously published works. The application of UV in caves is discussed and further experiments are proposed to enhance research in this domain.
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Affiliation(s)
- Fabien Borderie
- Laboratoire Chrono-Environnement, UMR CNRS 6249, Université de Franche-Comté, 16 route de Gray, 25030, Besançon, France
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15
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Bourioug M, Gimbert F, Alaoui-Sehmer L, Benbrahim M, Aleya L, Alaoui-Sossé B. Sewage sludge application in a plantation: effects on trace metal transfer in soil-plant-snail continuum. Sci Total Environ 2015; 502:309-314. [PMID: 25262293 DOI: 10.1016/j.scitotenv.2014.09.022] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2014] [Revised: 08/27/2014] [Accepted: 09/08/2014] [Indexed: 06/03/2023]
Abstract
We studied the potential bioaccumulation of Cu, Zn, Pb and Cd by the snail Cantareus aspersus and evaluated the risk of leaching after application of sewage sludge to forest plantation ecosystems. Sewage sludge was applied to the soil surface at two loading rates (0, and 6 tons ha(-1) in dry matter) without incorporation into the soil so as to identify the sources of trace metal contamination in soil and plants and to evaluate effects on snail growth. The results indicated a snail mortality rate of less than 1% during the experiment, while their dry weight decreased significantly (<0.001) in all treatment modalities. Thus, snails showed no acute toxicity symptoms after soil amendment with sewage sludge over the exposure period considered. Additions of sewage sludge led to higher levels of trace metals in forest litter compared to control subplots, but similar trace metal concentrations were observed in sampling plants. Bioaccumulation study demonstrated that Zn had not accumulated in snails compared to Cu which accumulated only after 28 days of exposure to amended subplots. However, Pb and Cd contents in snails increased significantly after 14 and 28 days of exposure in both the control and amended subplots. At the last sampling date, in comparison to controls the Cd increase was higher in snails exposed to amended subplots. Thus, sludge spread therefore appears to be responsible for the observed bioaccumulation for Cu and Cd after 28days of exposure. Concerning Pb accumulation, the results from litter-soil-plant compartments suggest that soil is this metal's best transfer source.
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Affiliation(s)
- Mohamed Bourioug
- Université de Franche-Comté, Laboratoire de Chrono-Environnement, UMR CNRS 6249, Besançon, France
| | - Frédéric Gimbert
- Université de Franche-Comté, Laboratoire de Chrono-Environnement, UMR CNRS 6249, Besançon, France
| | - Laurence Alaoui-Sehmer
- Université de Franche-Comté, Laboratoire de Chrono-Environnement, UMR CNRS 6249, Besançon, France
| | - Mohammed Benbrahim
- RITTMO Agroenvironnement, ZA Biopôle, 37 rue de Herrlisheim, CS 80023, F-68025 Colmar Cedex, France
| | - Lotfi Aleya
- Université de Franche-Comté, Laboratoire de Chrono-Environnement, UMR CNRS 6249, Besançon, France.
| | - Badr Alaoui-Sossé
- Université de Franche-Comté, Laboratoire de Chrono-Environnement, UMR CNRS 6249, Besançon, France
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Borderie F, Tête N, Cailhol D, Alaoui-Sehmer L, Bousta F, Rieffel D, Aleya L, Alaoui-Sossé B. Factors driving epilithic algal colonization in show caves and new insights into combating biofilm development with UV-C treatments. Sci Total Environ 2014; 484:43-52. [PMID: 24686144 DOI: 10.1016/j.scitotenv.2014.03.043] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2014] [Revised: 03/07/2014] [Accepted: 03/11/2014] [Indexed: 06/03/2023]
Abstract
The proliferation of epilithic algae that form biofilms in subterranean environments, such as show caves, is a major problem for conservators. In an effort to reduce the use of chemical cleansers when addressing this problem, we proposed investigating the effects of UV-C on combating algal biofilm expansion in a cave located in northeastern France (Moidons Cave). First, the biofilms and cavity were studied in terms of their algal growth-influencing factors to understand the dynamics of colonization in these very harsh environments. Next, colorimetric measurements were used both to diagnose the initial colonization state and monitor the UV-C-treated biofilms for several months after irradiation. The results indicated that passive dispersal vectors of the viable spores and cells were the primary factors involved in the cave's algae repartition. The illumination time during visits appeared to be responsible for greater colonization in some parts of the cave. We also showed that colorimetric measurements could be used for the detection of both thin and thick biofilms, regardless of the type of colonized surface. Finally, our results showed that UV-C treatment led to bleaching of the treated biofilm due to chlorophyll degradation even one year after UV-C treatment. However, a re-colonization phenomenon was colorimetrically and visually detected 16months later, suggesting that the colonization dynamics had not been fully halted.
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Affiliation(s)
- Fabien Borderie
- Laboratoire Chrono-Environnement (LCE), UMR CNRS 6249, Université de Franche-Comté, Place Leclerc, F-25030 Besançon, France
| | - Nicolas Tête
- Laboratoire Chrono-Environnement (LCE), UMR CNRS 6249, Université de Franche-Comté, Place Leclerc, F-25030 Besançon, France
| | - Didier Cailhol
- Laboratoire Environnement, Dynamique et Territoires de Montagne (EDYTEM), UMR CNRS 5204, Université de Savoie, F-73376 Le Bourget du Lac, France
| | - Laurence Alaoui-Sehmer
- Laboratoire Chrono-Environnement (LCE), UMR CNRS 6249, Université de Franche-Comté, Place Leclerc, F-25030 Besançon, France
| | - Faisl Bousta
- Laboratoire de Recherche des Monuments Historiques (LRMH), USR 3224, 29 rue de Paris, F-77420 Champs-sur-Marne, France
| | - Dominique Rieffel
- Laboratoire Chrono-Environnement (LCE), UMR CNRS 6249, Université de Franche-Comté, Place Leclerc, F-25030 Besançon, France
| | - Lotfi Aleya
- Laboratoire Chrono-Environnement (LCE), UMR CNRS 6249, Université de Franche-Comté, Place Leclerc, F-25030 Besançon, France.
| | - Badr Alaoui-Sossé
- Laboratoire Chrono-Environnement (LCE), UMR CNRS 6249, Université de Franche-Comté, Place Leclerc, F-25030 Besançon, France
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Ricaud S, Alaoui-Sossé B, Barnola P, Crabbé J. Dormance et croissance des bourgeons du platane hybride (Platanus acerifolia) en milieu urbain. ACTA ACUST UNITED AC 1995. [DOI: 10.1139/b95-015] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The purpose of this study is to analyse the physiology of Platanus acerifolia buds, especially latent buds that are exploited by urban prunings. Biological and biochemical tests have allowed us to observe the following: (i) The dormancy of the 1-year-old twig buds is weak and characterized, in November, by a mediobasitonic gradient of bud bursting ability. During the dormancy period, the latent buds have the same capacity to bud break as buds from the proximal part of 1-year-old twigs. The dormancy of the latent buds is weak but accentuated with bud ageing. (ii) The inhibition of the 1-year-old twig proximal buds is particularly detected during the dormancy period. Whatever the month, the latent buds are not able to develop unless the axis and the more distal buds above them are eliminated. (iii) The buds keep their intracellular properties (5,5′-dimethyloxazolidine-2,4-dione accumulation) if the axis above them is intact. (iv) The growth of the hybrid plane tree is characterized by a weak acrotony as well as a weak apparent endogenous rhythmicity. This growth is influenced by external factors, especially rainfall. Key words: buds, latent buds, dormancy, growth, 5,5′-dimethyloxazolidine-2,4-dione, Platanus acerifolia.
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