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Roy, M.; Schimann, H.; Braga-Neto, R.; Da Silva, R.A.E.; Duque, J.; Frame, D.; Wartchow, F.; Neves, M.A. |
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Diversity and Distribution of Ectomycorrhizal Fungi from Amazonian Lowland White-sand Forests in Brazil and French Guiana |
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Journal Article |
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2016 |
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Biotropica |
Abbreviated Journal |
Biotropica |
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48 |
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1 |
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90-100 |
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campina; campinarana; Amanitaceae; Amanitaceae; Boletaceae; Boletaceae; Campina; Campinarana; Herbarium; Herbário; Russulaceae; Russulaceae |
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White-sand forests are thought to host many ectomycorrhizal fungi, as demonstrated by the numerous fruiting body collections made by Rolf Singer in the lower Rio Negro in the late 1970s. Despite recognition of the importance of ectomycorrhizal fungi in white-sand forests, there has not yet been a systematic examination of diversity and taxonomic composition across white-sand forests, or more widely across lowland Amazonian forests. In an effort to broaden our view of ectomycorrhizal fungal diversity and distribution on white-sand forests, we collected ectomycorrhizal fruiting bodies in 10 plots of white-sand forests in Brazil and French Guiana between 2012 and 2014. We collected 221 specimens and 62 morphospecies, from the 10 plots, confirming that all studied white-sand forests host ectomycorrhizal fungi. Additionally, we searched for taxa associated with white sands among specimens deposited in Brazilian herbaria. We report 1006 unique ectomycorrhizal specimen records in 18 Brazilian herbaria, of which 137 specimens and 64 species are reported from white-sand forests, mainly in the state of Amazonas, Brazil. Russulaceae and Amanitaceae were frequent in all habitats, and Cortinarius were more frequent on white sands. Our results highlight the high diversity and heterogeneity of ectomycorrhizal communities on white-sand forests, and the wide distribution of ectomycorrhizal fungi throughout Brazil, irrespective of soil type. © 2016 The Association for Tropical Biology and Conservation. |
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Departamento de Sistemática e Ecologia, Universidade Federal da Paraíba, João Pessoa, PB, Brazil |
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Cited By :2; Export Date: 12 February 2016 |
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EcoFoG @ webmaster @ |
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658 |
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Dejean, A.; Delabie, J.H.C.; Cerdan, P.; Gibernau, M.; Corbara, B. |
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Title |
Are myrmecophytes always better protected against herbivores than other plants? |
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Journal Article |
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Year |
2006 |
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Biological Journal of the Linnean Society |
Abbreviated Journal |
Biol. J. Linn. Soc. |
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89 |
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1 |
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91-98 |
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Ant-plant mutualism; Azteca; Maieta; Myrmecophytes; Plant protection; Tococa; ant; defoliation; field method; mutualism; myrmecophyte; plant-herbivore interaction; Azteca; Azteca bequaerti; Clidemia; Crematogaster laevis; Formicidae; Maieta; Maieta guianensis; Pheidole minutula; Tococa; Tococa guianensis |
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The present field study compared the degree of defoliation of three Guianian melastome, two myrmecophytes (i.e. plants sheltering ants in hollow structures) and Clidemia sp., a nonmyrmecophytic plant serving as a control. Maieta guianensis Aubl. hosted mostly Pheidole minutula Mayr whatever the area, whereas Tococa guianensis Aubl. hosted mostly Azteca bequaerti Wheeler along streams and Crematogaster laevis Mayr or Azteca sp. 1 in the understory where it never blossomed. Only Tococa, when sheltering A. bequaerti in what can be considered as a truly mutualistic relationship, showed significantly less defoliation than control plants. In the other associations, the difference was not significant, but P. minutula is mutualistic with Maieta because it furnishes some protection (exclusion experiments) plus nutrients (previous studies). When devoid of ants, Tococa showed significantly greater defoliation than control plants; therefore, it was deduced that Tococa probably lacks certain antidefoliator metabolites that control plants possess (both Tococa and control plants are protected by ground-nesting, plant-foraging ants, which is termed 'general myrmecological protection'). Consequently, plant-ants other than A. bequaerti probably also protect Tococa slightly, thus compensating for this deficiency and permitting it to live in the understory until treefall gaps provide the conditions necessary for seed production. © 2006 The Linnean Society of London. |
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Laboratoire de Psychologie Sociale de la Cognition (UMR CNRS 6024), Université Blaise Pascal, 34 avenue Carnot, 63037 Clermont-Ferrand Cedex, France |
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00244066 (Issn) |
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Cited By (since 1996): 9; Export Date: 22 October 2011; Source: Scopus; Coden: Bjlsb; doi: 10.1111/j.1095-8312.2006.00660.x; Language of Original Document: English; Correspondence Address: Dejean, A.; Laboratoire d'Evolution et Diversité Biologique (UMR CNRS 5174), Université Toulouse III, Bâtiment 4R3, 118 route de Narbonne, 31062 Toulouse Cedex, France; email: dejean@cict.fr |
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EcoFoG @ webmaster @ |
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355 |
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Lachenaud, P.; Rossi, V.; Thevenin, J.-M.; Doaré, F. |
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Title |
The “Guiana” genetic group: A new source of resistance to cacao (Theobroma cacao L.) black pod rot caused by Phytophthora capsici |
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Journal Article |
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Year |
2015 |
Publication |
Crop Protection |
Abbreviated Journal |
Crop Prot. |
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67 |
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91-95 |
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Black pod; Cocoa; French guiana; Phytophthora capsici; Resistance; Phytophthora capsici; Theobroma cacao |
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Abstract |
Black pod rot, caused by Stramenopiles of the genus Phytophthora, leads to serious production losses in all cocoa growing zones. In order to reduce the impact of these pests, preference is given to genetic control using resistant varieties, and sources of resistance are actively being sought, particularly in wild cacao trees. Surveys were undertaken in the natural cacao tree populations of south-eastern French Guiana between 1985 and 1995 and an abundant amount of plant material belonging to a particular genetic group, the “Guiana” group, was collected. A great deal of work has shown the merits of this genetic group as a source of resistance to Phytophthora palmivora and megakarya. We describe here the results of a global study to assess the resistance of the 186 clones in the “Guiana” group “core collection” to a Guianese strain of Phytophthora capsici (strain Reg 2-6). This study, which used an efficient methodology (fifteen series of tests on leaf discs and a statistical test adapted to the ordinal nature of the basic data), showed that the “Guiana” genetic group is a major source of resistance to P.capsici. Strain Reg 2-6 proves to be particularly virulent, as the Scavina 6 control, an international reference for resistance to Phytophthora, is not resistant to it. However, 24 clones of the “Guiana” group are, and 92 have proved to be more resistant than Scavina 6, thereby showing the interest of the group in genetically controlling P.capsici.Thus, of the clones in the Guiana group that are more resistant to P.capsici than Scavina 6, some, which are also resistant to P.palmivora and/or Phytophthora megakarya, and also displaying some other notable qualities, could be incorporated into cocoa genetic improvement programmes in countries where P.capsici is rife on cacao trees. |
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CIRAD, UPR BSEF, BP 2572Yaoundé, Cameroon |
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Elsevier Ltd |
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02612194 (Issn) |
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Export Date: 12 November 2014; Coden: Crptd; Correspondence Address: Lachenaud, P.; CIRAD, UPR 106, BP 701, France |
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EcoFoG @ webmaster @ |
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565 |
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Scotti, I.; Burelli, A.; Cattonaro, F.; Chagne, D.; Fuller, J.; Hedley, P.E.; Jansson, G.; Lalanne, C.; Madur, D.; Neale, D.; Plomion, C.; Powell, W.; Troggio, M.; Morgante, M. |
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Title |
Analysis of the distribution of marker classes in a genetic linkage map: a case study in Norway spruce (Picea abies karst) |
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Journal Article |
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Year |
2005 |
Publication |
Tree Genetics & Genomes |
Abbreviated Journal |
Tree Genet. Genomes |
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Volume |
1 |
Issue |
3 |
Pages |
93-102 |
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Keywords |
Picea abies; conifers; linkage map; genome structure; molecular markers; autocorrelation |
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In order to analyze the large-scale structure of the genome of Norway spruce (Picea abies Karst.), a pseudo-testcross genetic linkage map was built using markers of six different types, belonging to the low (amplified fragment length polymorphisms, simple sequence repeats) or high (sequence-specific amplified polymorphisms, inter-retrotransposon amplified polymorphisms) copy-number fraction of the genome, and including expressed region-derived markers (expressed sequence tag polymorphisms). Twenty seven and 23 linkage groups of at least four markers were obtained for the female and the male parent maps, respectively. A subset of these linkage groups coalesced into 13 bi-parental linkage groups through markers shared between the two maps. This map was used to investigate the frequency of each marker type over chromosomes and the distribution of marker types relative to each other, using autocorrelation techniques. Our results show that, while the composition of chromosomes is homogeneous, low- and high-copy-number markers tend to occupy separate regions of the linkage groups, and that expressed sequences are preferentially associated with microsatellites and separated from retrotranspo sons. These results indicate that the spatial structure of Norway spruce chromosomes is not homogeneous. |
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INRA, UMR ECOFOG, Kourou 97387, French Guiana, Email: ivan.scotti@kourou.cirad.fr |
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SPRINGER HEIDELBERG |
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1614-2942 |
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ISI:000244896200002 |
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EcoFoG @ eric.marcon @ |
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167 |
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Niamké, F.B.; Amusant, N.; Stien, D.; Chaix, G.; Lozano, Y.; Kadio, A.A.; Lemenager, N.; Goh, D.; Adima, A.A.; Kati-Coulibaly, S.; Jay-Allemand, C. |
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Title |
4',5'-Dihydroxy-epiisocatalponol, a new naphthoquinone from Tectona grandis L. f. heartwood, and fungicidal activity |
Type |
Journal Article |
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Year |
2012 |
Publication |
International Biodeterioration and Biodegradation |
Abbreviated Journal |
Int. Biodeterior. Biodegrad. |
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74 |
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Pages |
93-98 |
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Keywords |
4',5'-Dihydroxy-epiisocatalponol; Decay resistance; Fungicidal; Heartwood; Naphthoquinone; Tectona grandis |
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A new naphthoquinone derivative was isolated from the heartwood of the teak stem. The chemical structure of this new compound, 4',5'-dihydroxy-epiisocatalponol, was determined using 1-D and 2-D nuclear magnetic resonance experiments, vibrational circular dichroism, HRMS, and optical rotation. We showed that this new naphthoquinone derivative plays a key role in the variability of decay resistance in teak wood. A high negative correlation was found between its concentration and the mass losses of the wood samples after exposure to the brown rot Antrodia sp., the fungus that is the most virulent against teak (R = -0.9; ρ < 0.0001). In-vitro bioassays allowed us to demonstrate that 4',5'-dihydroxy-epiisocatalponol acted as a fungicide against Trametes versicolor (white rot) at 58 mg ml -1 (0.22 mM). Overall, our results demonstrated that the concentration of 4',5'-dihydroxy-epiisocatalponol could be used as a new tool to evaluate teak wood durability. © 2012 Elsevier Ltd. |
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Laboratoire de Biochimie et de Physiologie Végétales, UMR 47 DIADE – Equipe Rhizogenèse, Université Montpellier II, Place Eugène Bataillon, 34095 Montpellier Cedex 05, France |
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09648305 (Issn) |
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Export Date: 27 September 2012; Source: Scopus; Coden: Ibbie; doi: 10.1016/j.ibiod.2012.03.010; Language of Original Document: English; Correspondence Address: Amusant, N.; CIRAD, Department Environments and societies, UMR Ecology forests of French Guiana, BP 732, 97310 Kourou cedex, French Guiana; email: nadine.amusant@cirad.fr |
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EcoFoG @ webmaster @ |
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435 |
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Van Langenhove, L.; Depaepe, T.; Vicca, S.; van den Berge, J.; Stahl, C.; Courtois, E.; Weedon, J.; Urbina, I.; Grau, O.; Asensio, D.; Peñuelas, J.; Boeckx, P.; Richter, A.; Van Der Straeten, D.; Janssens, I.A. |
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Regulation of nitrogen fixation from free-living organisms in soil and leaf litter of two tropical forests of the Guiana shield |
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Journal Article |
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Year |
2020 |
Publication |
Plant and Soil |
Abbreviated Journal |
Plant Soil |
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Volume |
450 |
Issue |
1-2 |
Pages |
93-110 |
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Keywords |
Free-living nitrogen fixation; French Guiana; Molybdenum; Nutrients; Phosphorus; Tropical forest; acetylene; leaf litter; molybdenum; nitrogen fixation; nutrient cycling; phosphorus; rainforest; reduction; soil biota; soil carbon; soil nitrogen; soil water; topographic effect; tropical forest; French Guiana |
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Background and aims: Biological fixation of atmospheric nitrogen (N2) is the main pathway for introducing N into unmanaged ecosystems. While recent estimates suggest that free-living N fixation (FLNF) accounts for the majority of N fixed in mature tropical forests, the controls governing this process are not completely understood. The aim of this study was to quantify FLNF rates and determine its drivers in two tropical pristine forests of French Guiana. Methods: We used the acetylene reduction assay to measure FLNF rates at two sites, in two seasons and along three topographical positions, and used regression analyses to identify which edaphic explanatory variables, including carbon (C), nitrogen (N), phosphorus (P) and molybdenum (Mo) content, pH, water and available N and P, explained most of the variation in FLNF rates. Results: Overall, FLNF rates were lower than measured in tropical systems elsewhere. In soils seasonal variability was small and FLNF rates differed among topographies at only one site. Water, P and pH explained 24% of the variation. In leaf litter, FLNF rates differed seasonally, without site or topographical differences. Water, C, N and P explained 46% of the observed variation. We found no regulatory role of Mo at our sites. Conclusions: Rates of FLNF were low in primary rainforest on poor soils on the Guiana shield. Water was the most important rate-regulating factor and FLNF increased with increasing P, but decreased with increasing N. Our results support the general assumption that N fixation in tropical lowland forests is limited by P availability. © 2019, The Author(s). |
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Department of Microbiology and Ecosystem Science, University of Vienna, Althanstr. 14, Vienna, 1090, Austria |
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Springer |
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0032079x (Issn) |
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EcoFoG @ webmaster @ |
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971 |
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Chevalier, M.; Robert, F.; Amusant, N.; Traisnel, M.; Roos, C.; Lebrini, M. |
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Enhanced corrosion resistance of mild steel in 1 M hydrochloric acid solution by alkaloids extract from Aniba rosaeodora plant: Electrochemical, phytochemical and XPS studies |
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Journal Article |
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Year |
2014 |
Publication |
Electrochimica Acta |
Abbreviated Journal |
Electrochim Acta |
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Volume |
131 |
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Pages |
96-105 |
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Acidic media; Adsorption-XPS; Aniba rosaeodora extract; Anibine; C38 steel; Corrosion inhibitor |
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The present report continues to focus on the broadening application of plant extracts for metallic corrosion control and reports on the inhibiting effect of the Aniba rosaeodora alkaloidic extract on the corrosion of C38 steel in 1 M hydrochloric acid. Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques were applied to study the metal corrosion behavior in the absence and presence of inhibitor. Studies on the phytochemical constituents were established to determine the active(s) molecule(s). XPS was also carried out to establish the mechanism of corrosion inhibition of the active molecule of C38 steel in acid solution. The inhibitor extract acted as an efficient corrosion inhibitor in 1 M HCl. The experimental data obtained from EIS method show a frequency distribution and therefore a modelling element with frequency dispersion behaviour, a constant phase element (CPEα, Q) has been used. Graphical methods are illustrated by synthetic data to determine the parameter of CPE (α, Q). Polarization studies showed that the Aniba rosaeodora alkaloidic extract was a mixed-type inhibitor and its inhibition efficiency increased with the inhibitor concentration. Studies on the phytochemical constituents of the total alkaloids extract shows that it contains the anibine as the major alkaloid. The results obtained from the electrochemical study have clearly showed that the inhibition efficiency of the total extract was due to the presence of anibine. The XPS studies showed the formation of inhibitor layer containing the Aniba rosaeodora alkaloidic extract and the anibine molecules. © 2014 Elsevier Ltd. All rights reserved. |
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Unité Matériaux et Transformations CNRS UMR 8207, Université Lille 1, École Nationale Supérieure de Chimie de Lille, Avenue Dimitri Mendeleïev-Bât. C7a BP 90108, 59652 Villeneuve d'Ascq, France |
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Elsevier Ltd |
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00134686 (Issn) |
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Export Date: 10 June 2014; Coden: Elcaa; Correspondence Address: Lebrini, M.; Laboratoire Matériaux et Molécules en Milieux Amazonien, UAG-UMR ECOFOG Campus Troubiran, Route de Baduel, 97337 Cayenne, French Guiana; email: mounim.lebrini@guyane.univ-ag.fr |
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EcoFoG @ webmaster @ |
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545 |
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Nicolini, E.; Caraglio, Y.; Pelissier, R.; Leroy, C.; Roggy, J.C. |
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Title |
Epicormic branches: a growth indicator for the tropical forest tree, Dicorynia guianensis Amshoff (Caesalpiniaceae) |
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Journal Article |
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Year |
2003 |
Publication |
Annals of Botany |
Abbreviated Journal |
Ann. Bot. |
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Volume |
92 |
Issue |
1 |
Pages |
97-105 |
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Keywords |
Dicorynia guianensis; architecture; epicormic branch; primary growth; secondary growth; tropical forest; French Guiana; height : diameter ratio |
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Architectural analyses of temperate tree species using a chronological approach suggest that the expression of epicormic branches is closely related to low growth rates in the axes that make up the branching system. Therefore, sole consideration of epicormic criteria may be sufficient to identify trees with low secondary growth levels or with both low primary and secondary growth levels. In a tropical tree such as Dicorynia guianensis (basralocus), where chronological studies are difficult, this relationship could be very useful as an easily accessible indicator of growth potentials. A simple method of architectural tree description was used to characterize the global structure of more than 1650 basralocus trees and to evaluate their growth level. Measurements of simple growth characters [height, basal diameter, internode length of submittal part (top of the main axis of the tree)] and the observation of four structural binary descriptors on the main stem (presence of sequential branches and young epicormic branches, state of the submittal part, global orientation), indicated that epicormic branch formation is clearly related to a decrease in length of the successive growth units of the main stem. Analysis of height vs. diameter ratios among different tree subgroups, with and without epicormic branching, suggested that trees with epicormic branches generally have a low level of secondary growth compared with primary growth. (C) 2003 Annals of Botany Company. |
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Cirad, UMR AMAP, F-34398 Montpellier 05, France |
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OXFORD UNIV PRESS |
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0305-7364 |
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ISI:000183980200010 |
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EcoFoG @ eric.marcon @ |
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245 |
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Ruiz-González, M.X.; Lauth, J.; Leroy, C.; Jauneau, A.; Gryta, H.; Jargeat, P.; Dejean, A.; Orivel, J. |
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Title |
An efficient protocol for isolating melanised chaetothyrialean anamorphic fungi associated with plant-ants |
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Journal Article |
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Year |
2013 |
Publication |
Journal of Basic Microbiology |
Abbreviated Journal |
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Volume |
53 |
Issue |
1 |
Pages |
98-100 |
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Allomerus ants; Black fungi; Chaetothyriales; Fluorescent staining; Isolation method |
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Abstract |
Because of their ecological characteristics, slow growth rates and the presence of contaminants, Chaetothyriales fungi associated with structures built by tropical plant-ants can be difficult to isolate with standard procedures. Here, we describe an easy-to-use protocol for obtaining pure cultures by using cotton as a first substrate. We have further found by means of fluorescent stains that nuclei concentrate either in young hyphae or in the tips of the hyphae. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. |
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Université de Toulouse, ECOLAB, Toulouse, France |
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Export Date: 6 February 2013; Source: Scopus |
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EcoFoG @ webmaster @ |
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461 |
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Fromin, N.; Saby, N.P.A.; Lensi, R.; Brunet, D.; Porte, B.; Domenach, A.-M.; Roggy, J.-C. |
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Spatial variability of soil microbial functioning in a tropical rainforest of French Guiana using nested sampling |
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2013 |
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Geoderma |
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197-198 |
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98-107 |
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Denitrification; Respiration; Scale dependent process; Soil microbial processes; Soil organic matter; Tree influence potential |
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Understanding the pattern in spatial distribution of soil microbial processes is critical to understand the environmental factors that regulate them as well as to scale up these processes to ecosystem. Soil samples from a 1. ha tropical rainforest plot (Paracou, French Guiana) were analyzed according a nested sampling approach using different separation distances ranging from 0.4 to 40. m. The variability of substrate induced respiration (SIR) and of denitrification enzyme activity (DEA) was characterized in relation to various soil properties (total C and N contents, NIRS related index of soil organic matter quality, SOMQ, and index of tree influence potential, IP). The variability of SIR and DEA was higher than that of environmental properties. The patterns of accumulated variance as a function of distance varied among the soil properties. The variability of SIR and DEA mainly occurred at small (1. m) scale (and at the 10-40. m-scales for SIR), probably reflecting the quality of litter input that results of the influence of local assemblage of different tree species, though changes in the soil N and C contents. Indeed, total soil C and N contents explained the microbial properties at every scale. Coefficients of codispersion showed that neither SOMQ nor IP did correlate with SIR and DEA, and confirmed that total C and N contents explained microbial properties in a scale dependent and complex manner. Such spatial dependency underlines the importance of soil heterogeneity in this tropical forest with implications for sampling strategies when studying the microbial processes and their response to disturbances. © 2012 Elsevier B.V. |
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UMR EcoFoG, BP 709, 97387 Kourou, GUF, France |
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Export Date: 13 February 2013; Source: Scopus |
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EcoFoG @ webmaster @ |
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466 |
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