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5 resultados encontrados para: AUTOR: Guerenstein, Pablo G
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1.
- Artículo con arbitraje
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Electroantennogram responses of the Triatoma dimidiata complex to volatiles produced by its exocrine glands
May Concha, Irving Jesús ; Guerenstein, Pablo G. (coaut.) ; Malo Rivera, Edi Álvaro (coaut.) ; Catalá, Silvia S. (coaut.) ; Rojas, Julio C. (coaut.) ;
Contenido en: Acta Tropica Vol. 185 (September 2018), p. 336-343 ISSN: 0001-706X
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Resumen en: Inglés |
Resumen en inglés

Members of the Triatoma dimidiata complex are vectors of the protozoan parasite Trypanosoma cruzi, the etiologic agent of Chagas disease. Morphological and genetic studies indicate that T. dimidiata complex has three principal haplogroups in Mexico. However, whether there are differences in the olfactory physiology among the haplogroups of this complex and a possible correlation with their antennal phenotype are not yet known. Antennal responses to 13 compounds released from the metasternal and Brindley´s glands, which are involved in the alarm and mating-related behaviours of T. dimidiata were investigated using electroantennography (EAG). Overall, of the 13 compounds tested, seven triggered EAG responses in both sexes of three Mexican haplogroups. The sensitivity of the EAG responses show some relationship with the total number of chemo-sensilla present on the antennae. Antennal sensitivity was different between sexes and haplogroups of the T. dimidiata complex. Discriminant analysis of EAG sensitivity was significant, separating the three haplogroups. Our finding is consistent with morphological and genetic evidence for haplogroups distinction within the complex.


2.
- Artículo con arbitraje
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Oviposition preference and larval performance and behavior of Trichoplusia ni (Lepidoptera: Noctuidae) on host and nonhost plants
García Coapio, Guadalupe (autora) ; Cruz López, Leopoldo Caridad (autor) ; Guerenstein, Pablo G. (autor) ; Malo Rivera, Edi Álvaro (autor) ; Rojas, Julio C. (autor) ;
Contenido en: Arthropod-Plant Interactions Vol. 12, no. 2 (April 2018), p. 267–276 ISSN: 1872-8855
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Resumen en: Inglés |
Resumen en inglés

We investigated the female oviposition preference and larval performance and behavior of Trichoplusia ni (Hubner) on cabbage, tomato, soybean (host plants), and wormseed (nonhost plant) in laboratory experiments. In addition, we investigated the role of trichomes in the oviposition of females. Females oviposited more often on cabbage than on tomato, soybean, or wormseed plants. Tomato was the second most preferred plant, followed by soybean and wormseed. Neonate larvae gained more weight on cabbage and tomato than on soybean or wormseed, while second-instar larvae grew better on cabbage than on tomato, soybean, or wormseed. The least growth of neonate larvae occurred on wormseed plants. The orientation of neonate and second-instar larvae to cabbage, tomato, soybean, and wormseed did not differ significantly. Neonate larvae settled equally on leaf discs of cabbage, tomato, soybean, and wormseed, while most second-instar larvae settled on leaf discs of cabbage in comparison with the other plants after 24 h of release. The foliar area consumed by neonate larvae was quite similar among plants, but second-instar larvae consumed more cabbage than tomato, soybean, or wormseed. Comparing different types of leaves, females oviposited more often on mature than young leaves of tomato, soybean, and wormseed. In contrast, females did not show any preference for ovipositing on young or mature leaves of cabbage. In general, we found that the density or length of nonglandular and glandular trichomes of tomato, soybean, and wormseed plants negatively affected oviposition of T. ni females.


3.
Tesis - Doctorado
El papel de la olfacción en la selección del hospedante por Trichoplusia ni (Hübner) / Guadalupe García Coapio
García Coapio, Guadalupe ; Rojas, Julio C. (director) ; Malo Rivera, Edi Álvaro (asesor) ; Cruz López, Leopoldo Caridad (asesor) ; Guerenstein, Pablo G. (asesor) ;
Tapachula, Chiapas, México : El Colegio de la Frontera Sur , 2017
Clasificación: TE/595.78 / G3
Bibliotecas: Tapachula
Cerrar
SIBE Tapachula
ECO020013588 (Disponible)
Disponibles para prestamo: 1
PDF
Índice | Resumen en: Español |
Resumen en español

El comportamiento de selección de plantas hospedantes por hembras de insectos holometábolos es crucial para la supervivencia de su progenie. La olfacción es el sentido más importante durante el proceso de búsqueda de hospedantes, pero al parecer los insectos generalistas están más limitados neuronalmente que los insectos especialistas para procesar los compuestos provenientes de sus plantas hospedantes. En esta tesis se investigó algunos aspectos del comportamiento de búsqueda de plantas hospedantes por Trichoplusia ni (Hübner), una especie de palomilla generalista. Particularmente, se estudió si la preferencia de las hembras durante la oviposición se correlaciona con el mejor desempeño larval. Adicionalmente, se investigó si las hembras fueron capaces de discriminar plantas de diferente calidad. Finalmente, se identificaron los compuestos volátiles involucrados en el comportamiento de búsqueda de hospedantes de T. ni. Los resultados mostraron que existe una concordancia parcial entre la oviposición de las hembras y el desempeño larval de T. ni; las hembras prefirieron ovipositar en repollo y su progenie tuvo una mayor ganancia de peso en esta planta y en tomate, con diferencias significativas en la ganancia de peso a la soya, y epazote. Las hembras prefirieron ovipositar en hojas maduras de tomate, soya, y epazote, las cuales tienen menos tricomas que las hojas jóvenes. Se encontró que en cada planta hay un número diferente de compuestos que son activos antenalmente. Una evaluación comportamental de una mezcla de cinco compuestos identificados en los extractos de soya mostró que, de 30 hembras grávidas evaluadas, 85% levantaron vuelo y 73% aterrizaron en el cebo. Los resultados sugieren que las hembras usan los volátiles de las plantas para discriminar entre plantas de diferente calidad.

Índice

Resumen
Capítulo I.
1.1. Olfacción en lepidópteros
1.2. Búsqueda de hospedantes
1.3. Relación preferencia de oviposición y desempeño larval
1.4. Defensa de la planta
1.5. Modelo de estudio
1.6. Biología e Importancia económica de Trichoplusia ni
1.7. Búsqueda de hospedante por hembras de T. ni
Literatura citada
Capítulo II.
Oviposition preference and larval behavior and performance of Trichoplusia ni (Lepidoptera: Noctuidae) on host and non-host plants
Capítulo III.
Herbivore Damage and Prior Egg Deposition on Host Plants Influence the Oviposition of the Generalist Moth Trichoplusia ni (Lepidoptera: Noctuidae)
Capítulo IV.
Respuestas electrofisiológica y comportamental de hembras de Trichoplusia ni a volátiles de plantas hospedantes y no hospedantes
Capítulo V.
Conclusiones
Literatura citada


4.
- Artículo con arbitraje
Antennal phenotype of Mexican haplogroups of the Triatoma dimidiata complex, vectors of Chagas disease
May Concha, Irving Jesús (autor) ; Guerenstein, Pablo G. (autor) ; Ramsey Willoquet, Janine M. (autor) ; Rojas, Julio C. (autor) ; Catalá, Silvia S. (autora) ;
Contenido en: Infection, Genetics and Evolution Vol. 40 (June 2016), p. 73–79 ISSN: 1567-1348
Resumen en: Inglés |
Resumen en inglés

Triatoma dimidiata (Latreille) is a species complex that spans North, Central, and South America and which is a key vector of all known discrete typing units (DTU) of Trypanosoma cruzi, the etiologic agent of Chagas disease. Morphological and genetic studies indicate that T. dimidiata is a species complex with three principal haplogroups (hg) in Mexico. Different markers and traits are still inconclusive regarding if other morphological differentiation may indicate probable behavioral and vectorial divergences within this complex. In this paper we compared the antennae of three Mexican haplogroups (previously verified by molecular markers ND4 and ITS-2) and discussed possible relationships with their capacity to disperse and colonized new habitats. The abundance of each type of sensillum (bristles, basiconics, thick- and thin-walled trichoids) on the antennae of the three haplogroups, were measured under light microscopy and compared using Kruskal–Wallis non-parametric and multivariate non-parametric analyses. Discriminant analyses indicate significant differences among the antennal phenotype of haplogroups either for adults and some nymphal stages, indicating consistency of the character to analyze intraspecific variability within the complex. The present study shows that the adult antennal pedicel of the T. dimidiata complex have abundant chemosensory sensilla, according with good capacity for dispersal and invasion of different habitats also related to their high capacity to adapt to conserved as well as modified habitats.

However, the numerical differences among the haplogroups are suggesting variations in that capacity. The results here presented support the evidence of T. dimidiata as a species complex but show females and males in a different way. Given the close link between the bug's sensory system and its habitat and host-seeking behavior, AP characterization could be useful to complement genetic, neurological and ethological studies of the closely related Dimidiata Complex haplogroups for a better knowledge of their vectorial capacity and a more robust species differentiation.


5.
- Artículo con arbitraje
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Herbivore damage and prior egg deposition on host plants influence the oviposition of the generalist moth trichoplusia ni (Lepidoptera: Noctuidae)
García Coapio, Guadalupe (coaut.) ; Cruz López, Leopoldo Caridad (coaut.) ; Guerenstein, Pablo G. (coaut.) ; Malo Rivera, Edi Álvaro (coaut.) ; Rojas, Julio C. (coaut.) ;
Contenido en: Journal of Economic Entomology Vol. 109, no. 6 (September 2016), p. 2364–2372 ISSN: 1938-291X
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Resumen en: Inglés |
Resumen en inglés

Female insects have the difficult task of locating host plants that maximize the survival and success of their offspring. In this study, the oviposition preferences of the cabbage looper moth, Trichoplusia ni (Hubner), for soybean plants, Glycine max (L.), under various treatments—undamaged, mechanically damaged, damaged by T. ni or Spodoptera frugiperda (Smith) larvae or by Bemisia tabaci (Gennadius) adults, egg-free plants, and plants previously oviposited by conspecific or heterospecific females (S. frugiperda )—were investigated using two-choice tests. Additionally, the volatile compounds emitted by the plants under the different treatments were identified by gas chromatography–mass spectrometry. Our results showed that females showed no preferences for undamaged or mechanically damaged plants. However, they oviposited more often on undamaged plants than on those previously damaged by T. ni, S. frugiperda ,or B. tabaci. In contrast, females preferred to oviposit on plants previously oviposited by conspecific and heterospecific females than on egg-free plants. Plants damaged by conspecific or heterospecific larvae emitted methyl salicylate, indole, and octyl butyrate, compounds not released by undamaged or mechanically damaged plants. Whitefly damage induced the release of higher quantities of Z(3)-hexenyl acetate, (R)-(+)-limonene, and (E)-β-ocimene compared to plants damaged by larvae and suppressed the emission of linalool. Egg deposition by conspecific and heterospecific moths induced the emission of (R)-(+)-limonene, octyl butyrate, and geranyl acetone but suppressed the release of linalool. This study showed that a generalist moth species can discriminate between plants of different quality, and suggests that females use volatile compounds as cues during this process.