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D. M. Magalhães – One of the best experts on this subject based on the ideXlab platform.

  • Anthonomus Grandis aggregation pheromone induces cotton indirect defence and attracts the parasitic wasp bracon vulgaris
    Journal of Experimental Botany, 2019
    Co-Authors: D. M. Magalhães, Miguel Borges, Raul Alberto Laumann, Izabela Thais Fidelis Alves Da Silva, Maria Carolina Blassiolimoraes


    Insect-derived volatiles seem to provide reliable chemical cues that plants could employ to defend themselves. Here we investigated the effect of pheromone emission from a closely associated (Anthonomus Grandis; boll weevil) and an unassociated (Tibraca limbativentris) herbivore on cotton volatile emission. Exposure to A. Grandis aggregation pheromone induced cotton defence response by enhancing the emission of volatiles attractive to the natural enemy of A. Grandis, the parasitic wasp Bracon vulgaris, but only when the pheromonal blend was complete (all four components). Individual components of A. Grandis aggregation pheromone were not able to induce cotton plants to increase the release of volatiles. On the other hand, T. limbativentris sex pheromone did not induce any change in the cotton constitutive volatile profile. Our results support the hypothesis that plants are able to detect pheromones of tightly co-evolved herbivores. Moreover, A. Grandis pheromone exposure induced similar volatile compounds to herbivore-induced cotton, such as linalool, (E)-ocimene, (E)-4,8-dimethylnona-1,3,7-triene (DMNT), and (E,E)-4,8,12-trimethyltrideca-1,3,7,11-tetraene (TMTT). We also showed that the larval ectoparasitoid B. vulgaris relies on boll weevil’s aggregation pheromone and pheromone-induced plant volatiles as kairomones to locate suitable hosts.

  • Identification of volatile compounds involved in host location by Anthonomus Grandis (Coleoptera: Curculionidae)
    Frontiers in Ecology and Evolution, 2018
    Co-Authors: D. M. Magalhães, Miguel Borges, Raul Alberto Laumann, Christine M. Woodcock, David M. Withall, John A. Pickett, Michael Alexander Birkett, Maria Carolina Blassioli-moraes


    Phytophagous insects rely on plant volatiles to locate suitable hosts upon which to feed or oviposit. The boll weevil, Anthonomus Grandis, is the main pest on cotton crops in the Neotropical region and is attracted to host plant volatiles, especially herbivore-induced volatiles from reproductive cotton. Behavioral and electrophysiological responses of the boll weevil were evaluated aiming the identification of the compounds responsible for host location. We found that ten compounds elicited antennal responses from A. Grandis, but only six were required to elicit a full behavioral response, namely: (R)-linalool, (E)-4,8-dimethyl-1,3,7-nonatriene (DMNT), methyl salicylate, (E)-(1R,9S)-caryophyllene, geranylacetone and (E-E)-4,8,12-trimethyl-1,3,7,11-tridecatetraene (TMTT). A synthetic blend comprising these six compounds was as attractive as the crude sample of cotton reproductive stage volatiles. These data are discussed in the context of insect host location and crop protection.

Ana Laura Nussenbaum – One of the best experts on this subject based on the ideXlab platform.

  • tecnica de sexado de pupas de Anthonomus Grandis coleoptera curculionidae una forma rapida y facil de sexar para estudios biologicos
    Revista de Investigaciones Agropecuarias, 2020
    Co-Authors: Melina Soledad Almada, Ana Laura Nussenbaum


    El picudo del algodonero, Anthonomus Grandis Boheman (Coleoptera: Curculionidae), es considerado una de las plagas mas perjudiciales del cultivo de algodon en America. Muchos estudios requieren la determinacion del sexo para lo que se utiliza diferentes tecnicas, pero estas tienen limitaciones o requieren cierto entrenamiento previo. En el presente trabajo, contribuimos con ilustraciones y fotografias de las diferencias entre sexos para mejorar su diferenciacion mediante una tecnica mas facil y rapida.

  • Discrimination of infested cotton squares by females of Anthonomus Grandis
    Journal of Pest Science, 2017
    Co-Authors: Ana Laura Nussenbaum, Melina Soledad Almada, Francisco Devescovi, M. N. Fogar, Juan Carlos Salerno, Jorge L. Cladera, Roberto E. Lecuona, Diego F. Segura


    The avoidance of infested squares of Gossypium hirsutum as oviposition substrate by females of Anthonomus Grandis was studied following two approaches. First, the preference for oviposition in infested versus non-infested squares was studied in laboratory. Second, the distribution of ovipositions by A. Grandis in nature was analyzed in cotton plots from Argentina. In addition, the consequences of multiple ovipositions were assessed in terms of emergence rate, adult weight and sex ratio. In the laboratory, the number of ovipositions was significantly higher in non-infested than in infested squares. Likewise, females were found to reject infested squares more frequently than non-infested squares. In the field, oviposition pattern fitted a uniform distribution for squares collected from the ground, while the distribution in squares sampled from the plant fitted random and uniform distributions. This suggests that oviposition decisions could be dynamic and change with the infestation conditions. Multiple ovipositions resulted in the elimination of competing larvae between L1 and L2 instars. The weight of the individual that develops to the adult stage was negatively affected by the level of larval competition, and the sex ratio deviated toward females. Our results suggest that females of A. Grandis tend to avoid already infested squares. This behavior would allow reducing the levels of intraspecific competition, which we also found can seriously affect the development of their progeny. A deeper knowledge of the oviposition behavior of A. Grandis could contribute to developing control methods against this important cotton pest.

G. R. Oliveira – One of the best experts on this subject based on the ideXlab platform.

  • Improving Cry8Ka toxin activity towards the cotton boll weevil (Anthonomus Grandis).
    BMC biotechnology, 2011
    Co-Authors: G. R. Oliveira, Alexandre Augusto Pereira Firmino, Wagner A. Lucena, Maria Cristina Mattar Da Silva, Erich Y.t. Nakasu, Magda Aparecida Beneventi, Djair S.l. Souza, José E Gomes, José Dijair Antonino De Souza, Daniel J. Rigden


    The cotton boll weevil (Anthonomus Grandis) is a serious insect-pest in the Americas, particularly in Brazil. The use of chemical or biological insect control is not effective against the cotton boll weevil because of its endophytic life style. Therefore, the use of biotechnological tools to produce insect-resistant transgenic plants represents an important strategy to reduce the damage to cotton plants caused by the boll weevil. The present study focuses on the identification of novel molecules that show improved toxicity against the cotton boll weevil. In vitro directed molecular evolution through DNA shuffling and phage display screening was applied to enhance the insecticidal activity of variants of the Cry8Ka1 protein of Bacillus thuringiensis.

  • Analysis of Cry8Ka5-binding proteins from Anthonomus Grandis (Coleoptera: Curculionidae) midgut.
    Journal of invertebrate pathology, 2010
    Co-Authors: Erich Yukio Tempel Nakasu, Alexandre Augusto Pereira Firmino, Simoni Campos Dias, Thales L. Rocha, Hudson B. Ramos, G. R. Oliveira, Wagner A. Lucena, Célia R. Carlini, Maria Fatima Grossi-de-sa


    Abstract Biotech crops expressing Bacillus thuringiensis Cry toxins present a valuable approach for insect control. Cry8Ka5, which is highly toxic to the cotton boll weevil ( Anthonomus Grandis ), was used as a model to study toxin–ligand interactions. Three Cry-binding proteins were detected after toxin overlay assays. Following de novo sequencing, a heat-shock cognate protein and a V-ATPase were identified, whilst a ∼120 kDa protein remained unknown. Additional Cry8Ka5-binding proteins were visualized by two-dimensional gel electrophoresis ligand blots.