Voici les éléments 1 - 10 sur 24
- PublicationMétadonnées seulementEffects of plant metabolites on the behavior and development of parasitic wasps(1998)
;Parasitoids are insects that spend their immature stages feeding from the tissues of other arthropods, eventually killing them. Many insects that serve as hosts for parasitoids are herbivorous, and metabolites from plants on which they feed can influence both the location of hosts by adult parasitoids and the development of the immature stages. For example, adult female parasitoids, which have the formidable task of locating often scarce and well-hidden hosts, may make effective use of chemical signals that plants emit in response to herbivory. The signals are used to guide them to herbivores that are damaging the plants. Also, plant-produced toxins along with digestibility reducers may slow down herbivore development, prolonging the time that they are vulnerable to parasitoids. The influence of plant chemicals continues after a parasitoid egg has been deposited in or on a host. An immature parasitoid uses the host as its sole source of nutrients. As the diet of hosts, plants can affect their development and physiological condition and thus, the overall suitability and quality of hosts as resources for parasitoid larvae. Here we give an overview of what is known about these interactions between plants and parasitoids and speculate on the possibility that parasitoids and other natural enemies of herbivorous arthropods may have, to some extent, contributed to the evolutionary pressures from which plant chemical traits have evolved.
- PublicationAccès libreHorismenus species (Hymenoptera: Eulophidae) in a bruchid beetle parasitoid guild, including the description of a new species
;Hansson, Christer ;Four species of Horismenus (Hymenoptera: Eulophidae) associated with Acanthoscelides spp.(Coleoptera: Bruchidae), three of which are also associated with Phaseolus spp., are treated. One of the species, H. butcheri, is described as new and the remaining three species are redescribed. Allfour species are diagnosed in a key. A lectotype is designated for Holcopelte productus Ashmead.
- PublicationMétadonnées seulement
- PublicationMétadonnées seulementBio-inoculation of yerba mate seedlings (Ilex paraguariensis St. Hill.) with native plant growth-promoting rhizobacteria: a sustainable alternative to improve crop yield(2015)
;Bergottini, Veronica M. ;Otegui, Monica B. ;Sosa, D. ;Zapata, Pedro D. ; ; ; ;Wiss, Fabio ;In this study, the role of native plant growth-promoting rhizobacteria (PGPR) as bio-inoculants was assessed as an alternative to ameliorate Ilex paraguariensis St. Hill. growth in nursery comparing poorer (soil) versus richer (compost) substrates. Twelve rhizospheric strains isolated from yerba mate plantations were evaluated in vitro for their potential as PGPRs. Three isolates, identified as Kosakonia radicincitans YD4, Rhizobium pusense YP3, and Pseudomonas putida YP2, were selected on the basis of their N-2 fixation activity, IAA-like compound and siderophore production, and phosphate solubilization. A highly significant positive effect of bio-inoculation with the native isolates was observed in 5-month-old seedlings cultivated in soil. The highest increase was observed in seedlings inoculated with K. radicincitans YD4 with an increase of 183 % in the dry shoot weight and a 30 % increase in shoot N content. In contrast, in compost, no increment in the dry weight was observed; however, an increase in content in some macronutrients in shoots was observed. Remarkably, when plant biomass was compared between soil and compost, seedlings inoculated with K. radicincitans YD4 in soil produced the highest yields, even though higher yields could be expected in compost due to the richness of this substrate. In conclusion, bio-inoculation of yerba mate seedlings with native PGPR increases the yield of this crop in nursery and could represent a promising sustainable strategy to improve yerba mate growth in low-fertility soils.
- PublicationMétadonnées seulementSibling species of bean bruchids: a morphological and phylogenetic study of Acanthoscelides obtectus Say and Acanthoscelides obvelatus Bridwell(2005)
;Alvarez, Nadir ;Hossaert-Mckey, Martine ;Rasplus, J. Y. ;McKey, D. ;Mercier, Leny ;Soldati, L. ; ;Shani, Tal
- PublicationMétadonnées seulementEfectos de los metabolitos secundarios vegetales en el comportamiento y desarrollo de avispas parasitoides(México: Instituto de Ecología, 2001)
; ; ;Anaya, Ana Luisa ;Espinosa-García, Francisco JavierCruz-Ortega, Rocío
- PublicationMétadonnées seulementThe potential of native parasitoids for the control of Mexican bean beetles: A genetic and ecological approach(2008)
; ;Shani, Tal ;Hansson, Christer ;Contreras-Garduno, Jorge ;Mansion, Guilhem
- PublicationMétadonnées seulementPlant species variation in bottom-up effects across three trophic levels: a test of traits and mechanisms(2015-7-21)
;Moreira, Xoaquin ;Abdala-Roberts, Luis ;Hernandez-Cumplido, Johnattan ; ;Kenyon, Sarah G
- PublicationMétadonnées seulementMicrosatellite markers in a complex of Horismenus sp.(Hymenoptera: Eulophidae), parasitoids of bruchid beetles(2004)
; ;Alvarez, Nadir ;Butcher, R. D. J. ;Hansson, Christer ;Risterucci, A. M.
- PublicationMétadonnées seulementIsolation and characterization of polymorphic microsatellite loci in Acanthoscelides obvelatus Bridwell (Coleoptera: Bruchidae)(2003)
;Alvarez, Nadir ; ;Risterucci, A. M. ;Hossaert-Mckey, Martine
- 1 (current)