Search Results - (Author, Cooperation:E. Wajnberg)
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1Latest Papers from Table of Contents or Articles in PressJ. F. Flot ; B. Hespeels ; X. Li ; B. Noel ; I. Arkhipova ; E. G. Danchin ; A. Hejnol ; B. Henrissat ; R. Koszul ; J. M. Aury ; V. Barbe ; R. M. Barthelemy ; J. Bast ; G. A. Bazykin ; O. Chabrol ; A. Couloux ; M. Da Rocha ; C. Da Silva ; E. Gladyshev ; P. Gouret ; O. Hallatschek ; B. Hecox-Lea ; K. Labadie ; B. Lejeune ; O. Piskurek ; J. Poulain ; F. Rodriguez ; J. F. Ryan ; O. A. Vakhrusheva ; E. Wajnberg ; B. Wirth ; I. Yushenova ; M. Kellis ; A. S. Kondrashov ; D. B. Mark Welch ; P. Pontarotti ; J. Weissenbach ; P. Wincker ; O. Jaillon ; K. Van Doninck
Nature Publishing Group (NPG)
Published 2013Staff ViewPublication Date: 2013-07-23Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsKeywords: Animals ; *Biological Evolution ; Gene Conversion/*genetics ; Gene Transfer, Horizontal/genetics ; Genome/*genetics ; Genomics ; Meiosis/genetics ; Models, Biological ; Reproduction, Asexual/*genetics ; Rotifera/*genetics ; TetraploidyPublished by: -
2Articles: DFG German National LicensesJacquet, M. ; Bongiovanni, M. ; Martinez, M. ; Verschave, P. ; Wajnberg, E. ; Castagnone-Sereno, P.
Oxford, UK : Blackwell Science Ltd
Published 2005Staff ViewISSN: 1365-3059Source: Blackwell Publishing Journal Backfiles 1879-2005Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, NutritionNotes: Root-knot nematodes (Meloidogyne spp.) are among the main pathogens of tomato (Lycopersicon esculentum) worldwide. Plant resistance is currently the method of choice for controlling these pests and all the commercially available resistant cultivars carry the dominant Mi gene, which confers resistance to the three main species Meloidogyne arenaria, M. incognita and M. javanica. However the emergence of virulent biotypes able to overcome the tomato resistance gene may constitute a severe limitation to such a control strategy. To date, little was known of the possible influence of the homozygous vs heterozygous allelic state of the Mi locus, or the tomato genetic background, on the expression of the resistance. In order to test both these factors, the resistance was evaluated of a large panel of L. esculentum genotypes (selected from the Vilmorin germplasm stock collection) to seven M. incognita lines avirulent or virulent against the Mi gene. Plant resistance was estimated by counting the egg masses on the root systems after inoculation with second-stage juveniles (J2). Reproduction of the nematodes was similar or, more often, significantly higher on heterozygous tomato genotypes than on homozygous ones, suggesting a possible dosage effect of the Mi gene. Data also indicated that the tomato genetic background had a major effect on the variations observed in nematode reproduction, especially when tomato genotypes were heterozygous for the Mi gene. These results have important consequences in terms of breeding strategies and durability of the resistance conferred by the Mi gene.Type of Medium: Electronic ResourceURL: -
3Articles: DFG German National LicensesStaff View
ISSN: 0005-2736Keywords: Chlorpromazine ; ESR ; Micelle ; Phase transition ; Spin labelSource: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: BiologyChemistry and PharmacologyMedicinePhysicsType of Medium: Electronic ResourceURL: -
4Articles: DFG German National LicensesStaff View
ISSN: 0014-5793Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: BiologyChemistry and PharmacologyPhysicsType of Medium: Electronic ResourceURL: -
5Articles: DFG German National LicensesStaff View
ISSN: 0009-2614Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: Chemistry and PharmacologyPhysicsType of Medium: Electronic ResourceURL: -
6Articles: DFG German National LicensesStaff View
ISSN: 0375-9601Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: PhysicsType of Medium: Electronic ResourceURL: -
7Articles: DFG German National LicensesStaff View
ISSN: 1570-7458Keywords: reactive distance ; walking path analysis ; Trichogramma ; genetic variability ; Ephestia kuehniella ; Mamestra brassicae ; glass beads ; simulation modelSource: Springer Online Journal Archives 1860-2000Topics: BiologyNotes: Abstract Efficiency of hymenopterous parasitoids to control pests in a biological control release program probably increases with increasing searching ability of the females, which, in return, likely depends on the distance from which females perceive their hosts (i.e., reactive distance). In this study, we first analyse this hypothesis with the help of a stochastic model simulating the walking path of isolatedTrichogramma females during their searching behaviour. Then, this reactive distance is estimated using automatic recording and analysis of the walking path of female wasps. Finally, the genetic variability for this trait is analysed in aTrichogramma brassicae Bezdenko (Hym.; Trichogrammatidae) population. Three types of hosts were used: Eggs ofEphestia kuehniella Zeller (Lep.; Pyralidae), eggs ofMamestra brassicae L. (Lep.; Noctuidae) and 0.45 mm glass beads.M. brassicae eggs are perceived from 4.01±0.15 mm, which is a significantly longer perceptive distance than forE. kuehniella eggs (3.69±0.10 mm) and glass beads (3.67±0.10 mm). Moreover, whatever the host tested, a significant genetic variation is observed in this trait in the population studied. The ecological and evolutionary implications and the agronomical importance of these results are discussed.Type of Medium: Electronic ResourceURL: -
8Articles: DFG German National LicensesStaff View
ISSN: 1570-7458Keywords: Progeny allocation ; superparasitism ; genetic variation ; superparasitism avoidance ; parasitoid ; Trichogramma ; Ephestia kuehniellaSource: Springer Online Journal Archives 1860-2000Topics: BiologyDescription / Table of Contents: Résumé Récemment, de nombreux travaux ont été publiés dans le but de mieux comprendre les différentes stratégies de reproduction (i.e. répartition de la progéniture parmi les hôtes) présentées par les insectes parasitoides sous différentes contraintes environnementales (cf. Waage, 1986, pour une synthèse). L'ensemble de ces travaux considère chacune de ces stratégies (e.g. nombre d'œufs déposés par hôte, décision de superparasiter) comme un phénomène progressivement mis en place par la sélection naturelle au cours des générations. Ceci n'est cependant concevable que si les caractères biologiques en cause chez les parasites sont sous la dépendance d'une variation génétique sur laquelle la sélection naturelle peut agir. Les expériences présentées ici ont donc eu pour but de voir si ces caractères sont effectivement déterminés génétiquement dans une population de Trichogramma maidis Pintureau & Voegelé (Hym.; Trichogrammatidae). Grâce à l'utilisation d'une coloration histologique qui permet de compter le nombre d'œufs de trichogrammes déposés dans chaque hôte, différentes lignées isofemelles (i.e. familles) ont été comparées, et ce selon différentes conditions expérimentales correspondant à différentes valeurs du rapport nombre de femelles parasites sur nombre d'hôtes offerts. Les résultats obtenus motrent que le phénomène du superparasitisme semble être déterminé génétiquement. Ceci est constaté aussi bien au niveau du nombre moyen d'œufs de trichograme déposés par hôte, que dans les caractéristiques des distributions des œufs de parasites parmi les hôtes. Les conséquences évolutives de tels résultats, ainsi que leurs applications possibles dans le but d'améliorer les conditions d'élevage de masse de ces insectes, sont discutées.Notes: Abstract A considerable amount of work has been recently devoted to the study of progeny allocation strategies by insect parasitoids under different environmental constraints (see Waage, 1986, for a review). All these studies present each of the oviposition strategies (e.g. number of eggs laid per host, superparasitism) as a phenomenon which is progressively settled by natural selection during the course of generations. However, this optimal progeny allocation theory is conceivable only if the variation in wasp's biological traits involved are under a genetic control on which natural selection could act. We have decided therefore to look for a genetic variability in these traits in a Trichogramma maidis Pintureau & Voegelé (Hym.; Trichogrammatidae) population. Based on histological staining which allows to count the number of Trichogramma eggs deposited in each host (Ephestia kuehniella Zeller), we compared different wasp isofemale lines (i.e. families) each of which was submitted to different conditions (i.e. parasite/host ratios). The results show that the control of superparasitism seems to be genetically determined. This appears true both for the average number of eggs deposited in each host, and for the frequency distribution of wasp eggs among hosts. The evolutionary consequences of such results and their possible applications in order to improve the wasp's mass-rearing conditions are discussed.Type of Medium: Electronic ResourceURL: -
9Articles: DFG German National LicensesStaff View
ISSN: 1570-7458Keywords: Drosophila parasites ; host infestation ; host suitability ; genetic variability ; nutritional influencesSource: Springer Online Journal Archives 1860-2000Topics: BiologyDescription / Table of Contents: Résumé Les résultats de l'infestation des larves de D. melanogaster par les Cynipides Leptopilina boulardi et L. heterotoma varient selon le génotype des hôtes et leur état nutritionnel. L'analyse génétique de la population hôte par la méthode des lignées isofemelles montre que le degré d'infestation (pourcentage de larves effectivement parasitées dans des tests standidardisés) varie significativement entre lignées. Le taux de succès du développement parasitaire (pourcentage d'hôtes parasités fournissant un parasite adulte) est plus élevé chez L. heterotoma que chez L. boulardi et varie fortement entre lignées d'hôtes. Les variations chez les deux parasites sont corrélées. La sous-alimentation des larves parasitées augmente le succès du développement des deux parasites et celui de L. boulardi devient alors égal à celui de L. heterotoma. La réponse à l'infestation par les deux Cynipides n'est pas uniforme au sein de la population hôte et varie en fonction de l'abondance des ressources nutritionnelles de ce dernier.Notes: Abstract Infestation of larvae of Drosophila melanogaster by both Leptopilina boulardi and L. heterotoma (Hymenoptera, Cynipidae: Eucoilidae) varies according to within-population genetic variations in the hosts. L. heterotoma larvae thrive better than L. boulardi and developmental success of both parasitoids varies according to the host's genotype. Crowding in hosts improves success rate of both species, that of L. boulardi then being equal to that of L. heterotoma.Type of Medium: Electronic ResourceURL: -
10Articles: DFG German National LicensesStaff View
ISSN: 1432-1904Source: Springer Online Journal Archives 1860-2000Topics: BiologyChemistry and PharmacologyNatural Sciences in GeneralType of Medium: Electronic ResourceURL: -
11Articles: DFG German National LicensesStaff View
ISSN: 0141-8130Keywords: Photolysis ; electron paramagnetic resonance ; electron spin resonance ; haemoglobinSource: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: BiologyChemistry and PharmacologyType of Medium: Electronic ResourceURL: -
12Articles: DFG German National LicensesStaff View
ISSN: 0141-8130Keywords: Haemoglobin ; reassociation dynamics ; rebinding modelsSource: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: BiologyChemistry and PharmacologyType of Medium: Electronic ResourceURL: -
13Articles: DFG German National LicensesStaff View
ISSN: 0141-8130Keywords: Photolysis ; fractal ; nitrosyl haemoglobinSource: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: BiologyChemistry and PharmacologyType of Medium: Electronic ResourceURL: -
14Articles: DFG German National LicensesStaff View
ISSN: 0141-8130Keywords: Hemichrome ; denaturation ; haemoglobin, electron paramagnetic resonanceSource: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: BiologyChemistry and PharmacologyType of Medium: Electronic ResourceURL: -
15Articles: DFG German National LicensesStaff View
ISSN: 0141-8130Keywords: Photolysis ; electron paramagnetic resonance ; nitrosyl haemoglobin ; quaternary structureSource: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: BiologyChemistry and PharmacologyType of Medium: Electronic ResourceURL: -
16Articles: DFG German National LicensesCastagnone-Sereno, P. ; Wajnberg, E. ; Bongiovanni, M. ; Leroy, F. ; Dalmasso, A.
Springer
Published 1994Staff ViewISSN: 1432-2242Keywords: Tomato ; M. incognita ; Virulence ; Genetic variation ; InheritanceSource: Springer Online Journal Archives 1860-2000Topics: BiologyNotes: Abstract Resistance to the parthenogenetic root-knot nematodeMeloidogyne incognita is controlled in tomato by the single dominant geneMi, against which virulent pathotypes are able to develop. Isofemale lines (i.e., families) were established from a natural avirulent isolate ofM. incognita in order to study the genetic variability and inheritance of the nematode virulence. From the progeny of individual females, the production of egg masses on the root system of theMi-resistant tomato ‘Piersol’ was analyzed in artificial selection experiments. A family analysis revealed, after two successive generations, a strongly significant variation between the 63 isofemale lines tested, and the results obtained for the mothers and their daughters were also significantly correlated. These results together clearly demonstrate the existence of a genetic variability and inheritance for this character. In a second experiment, a four-generation selection was performed on 31 other isofemale lines. The results revealed a significant response to selection apparently limited only to the two families able to produce, in first generation, a significant minimal egg-mass number on the resistant cultivar.Type of Medium: Electronic ResourceURL: -
17Articles: DFG German National LicensesPfannes, H. -D. ; Bemski, G. ; Wajnberg, E. ; Rocha, H. ; Bill, E. ; Winkler, H. ; Trautwein, A. X.
Springer
Published 1994Staff ViewISSN: 1572-9540Source: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract Nitrosyl hemoglobin was prepared by bubbling fresh57Fe-enriched rat hemoglobin with NO. S- and X-band EPR spectra at 77 K are typical for anS=1/2 system with an anisotropicg-tensor and exhibit hyperfine interactions of14N with the electronic spin. Mössbauer spectra at 4.2 and 100 K consist of a superposition of spectra from high- and low-spin Fe(III), deoxygenated hemoglobin and a component corresponding toS=1/2,g=2, hyperfine constantsA xx /g n Β n =A yy /g n Β n =−19.6 T,A zz /g n Β n =6.8 T, quadrupole splitting δE Q=1.5 mm s−1, isomer shiftI s=0.42 mm s−1 and linewidth 0.4 mm s−1. The spin-lattice relaxation rate at 100 K is 〈2×106 s−1.Type of Medium: Electronic ResourceURL: -
18Articles: DFG German National LicensesStaff View
ISSN: 1573-8248Keywords: Trichogramma ; ovipositor ; sensory receptors ; ovipositeur ; organes sensorielsSource: Springer Online Journal Archives 1860-2000Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, NutritionDescription / Table of Contents: Résumé Des récepteurs sensoriels ont été mis en évidence sur l'ovipositeur deT. maidis. Il existe des sensilles sur les valvifères 2 (1 type), l'extrémité des valves 3 (2 types) et les valves 1 (4 types). La nature et le rôle possibles de ces organes sont discutés.Notes: Abstract Sensory receptors of the ovipositor ofTrichogramma maidis are described. Sense organs are found on the 2nd valvifers (1 type), on the tip of the 3rd valvulae (2 types) and on the 1st valvulae (4 types). The nature and possible functions of these sensilla are discussed.Type of Medium: Electronic ResourceURL: -
19Articles: DFG German National LicensesStaff View
ISSN: 1573-8248Keywords: Heteroptera ; Miridae ; Macrolophus caliginosus ; predation ; functional response ; feeding preference ; biological control ; Myzus persicae ; Tetranychus urticae ; prédation ; réponse fonctionnelle ; préférence alimentaire ; lutte biologiqueSource: Springer Online Journal Archives 1860-2000Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, NutritionDescription / Table of Contents: Résumé L'étude en laboratoire des réponses fonctionnelles des femelles adultes deMacrolophus caliginosus Wagner vis-à-vis des deux proiesMyzus persicae Sulzer etTetranychus urticae Koch montre dans les 2 cas une réponse de type II deHolling (1959). L'estimation du temps de manipulation (Th) et du taux d'attaque instantané (a) pour l'aphide (Th=.055 jour; a=1.035) et pour l'acarien (Th=.025 jour; a=.947) permet d'établir un modèle mathématique décrivant la prédation sur les 2 proies présentes simultanément et de préciser ainsi, au regard des résultats expérimentaux, l'existence d'une préférence du miride pour le puceronM. persicae.Notes: Abstract Functional response studies of females ofMacrolophus caliginosus Wagner for 2 prey speciesMyzus persicae Sulzer andTetranychus urticae Koch showedHolling's type II response (1959). Estimations of handling time (Th) and attack rate (a) obtained for the aphid (Th=.055 day; a=1.035) and for the mite (Th=.025 day; a=.947) enabled the development of a mathematical model which describes the predation rate on the 2 prey simultaneously. This mirid shows a sharp preference for aphids over mites.Type of Medium: Electronic ResourceURL: -
20Articles: DFG German National LicensesStaff View
ISSN: 1573-8248Keywords: Drosophila parasites ; Host suitability ; Genetic variability ; Nutritional influencesSource: Springer Online Journal Archives 1860-2000Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, NutritionDescription / Table of Contents: Résumé L'adéquation des larves deDrosophila melanogaster à leur parasiteLeptopilina boulardi (Nordlander, 1980) montre d'importantes variations génétiques et épigénétiques. Les expériences ont été réalisées sur des lignées isofemelles de drosophiles. Dans les conditions optimales de développement en laboratoire, en moyenne 50 % des larves de drosophiles parasitées conduisent à l'émergence d'un parasite adulte, et une variation significative est observée entre les lignées. En condition de surpeuplement, cette valeur moyenne atteint 90 %, et aucune variabilité significative n'est observée entre les lignées. Les conséquences génétiques et démographiques de ces résultats sont discutées.Notes: Abstract Suitability ofDrosophila melanogaster larvae to their endoparasiteLeptopilina boulardi (Nordlander, 1980) shows wide genetic and epigenetic variation. Experiments were done onDrosophila isofemale lines. When reared in optimal laboratory conditions only 50 % of parasitizedDrosophila larvae gave rise to an adult wasp, and significant variation was observed between lines. In crowded conditions, this average value increased up to 90 % and no more significant variability could be detected between lines. Genetic and demographic consequences of these results are discussed.Type of Medium: Electronic ResourceURL: