The kariotype of the parasitoid Chelonus insularis Cresson (Hymenoptera, Braconidae, Cheloninae)

Silva, Juvenal Cordeiro; Pompolo, Silvia das Graças; Campos, Lúcio Antônio de Oliveira; Cruz, I.

doi:10.1590/s0034-71082000000200019

Cited by 2 publications

(2 citation statements)

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“…Silva-Junior et al (2000a) therefore hypothesized that this particular feature had probably resulted from a centric fission, and we agree with this assumption. Interestingly, another tropical/subtropical parasitoid, Chelonus insularis Cresson, 1865 (Braconidae), also shows n = 7 (Silva-Junior et al 2000b), as opposed to n = 6 in all other studied species of temperate Cheloninae (Gokhman 2009), and this is also interpreted as a case of centric fission.…”

Section: Discussionmentioning

confidence: 99%

“…Silva-Junior et al 2000a), which substantially hampers our knowledge of worldwide patterns of karyotype structure and evolution in parasitoid Hymenoptera. Furthermore, research of this kind rarely goes beyond the chromosome numbers and some other results of conventional staining (Silva-Junior et al 2000b, Santos et al 2015), and when it does, it often reveals previously unknown karyotypic features (Carabajal Paladino et al 2013). To promote better understanding of the above-mentioned patterns, we have recently studied chromosome sets of three polyphagous parasitoids from Brazil, i.e., Palmistichus elaeisis Delvare et LaSalle, 1993, Trichospilus diatraeae Cherian et Margabandhu, 1942 (both belong to the family Eulophidae) and Trichogramma pretiosum Riley, 1879 (Trichogrammatidae) using both routine (Giemsa) and base-specific fluorochrome staining.…”

Section: Introductionmentioning

confidence: 99%

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A cytogenetic study of three parasitic wasp species (Hymenoptera, Chalcidoidea, Eulophidae, Trichogrammatidae) from Brazil using chromosome morphometrics and base-specific fluorochrome staining

Gokhman¹,

Pereira²,

Costa³

2017

CCG

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Chromosomes of three chalcid wasp species from Brazil, Palmistichus elaeisis Delvare et LaSalle, 1993, Trichospilus diatraeae Cherian et Margabandhu, 1942 (both belonging to the family Eulophidae) and Trichogramma pretiosum Riley, 1879 (Trichogrammatidae), were studied using chromosome morphometrics and base-specific fluorochrome staining. The present study confirmed that these species respectively have 2n = 12, 14 and 10. Chromomycin A3 / 4’, 6-diamidino-2-phenylindole (CMA3/DAPI) staining revealed a single CMA3-positive and DAPI-negative band within haploid karyotypes of both Palmistichus elaeisis and Trichogramma pretiosum. This CG-rich band clearly corresponds to the nucleolus organizing region (NOR). Moreover, analogous multiple telomeric bands found on all chromosomes of Trichospilus diatraeae may also represent NORs. Certain features of karyotype evolution of the phylogenetic lineage comprising both Eulophidae and Trichogrammatidae are discussed. The results obtained during the present study demonstrate the importance of chromosome research on tropical parasitoids that remain poorly known in this respect.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A cytogenetic study of three parasitic wasp species (Hymenoptera, Chalcidoidea, Eulophidae, Trichogrammatidae) from Brazil using chromosome morphometrics and base-specific fluorochrome staining

Gokhman¹,

Pereira²,

Costa³

2017

CCG

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Influence of parasitism by Chelonus insularis Cresson (Hymenoptera: Braconidae) on the susceptibility of Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) to insecticides

Zenner¹,

Álvarez²,

Barreto³

2006

Neotrop. Entomol.

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Neotropical Entomology 35(6):818-822 (2006) Infl uencia del Parasitismo por Chelonus insularis Cresson (Hymenoptera: Braconidae) sobre la Susceptibilidad de Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) a Insecticidas RESUMEN -El parasitoide huevo-larva Chelonus insularis Cresson es un parasitoide clave del cogollero del maíz, Spodoptera frugiperda (J.E. Smith) durante la segunda generación de campo en el Valle Superior del Río Magdalena de Colombia. A pesar de la presión de selección se encuentra una susceptibilidad mayor a insecticidas en la segunda generación, comparado con la primera, siendo para esto la única diferencia aparente el parasitismo. Por esta razón, la susceptibilidad a clorpirifos, metomyl, cipermetrina y Bacillus thuringiensis de larvas parasitadas y no parasitadas del segundo instar del cogollero fueron evaluadas, utilizando el test de inmersión foliar. Las larvas parasitadas fueron 3,93 veces más suscptibles a clorpirifos, 3,71 veces más a metomyl y 14,11 veces más a cipermetrina que las no parasitadas. El menor efecto del parasitismo sobre la susceptibilidad se encontró con B. thuringiensis. Se discute la infl uencia negativa de las aplicaciones de insecticidas sintéticos sobre la dinámica poblacional del parasitoide, lo mismo que sus implicaciones en estudios de resistencia.PALABRAS CLAVE: Cogollero del maíz, parasitoide huevo-larva, resistencia a insecticidas, manejo integrado de plagas ABSTRACT -The egg-larval parasitoid Chelonus insularisCresson is a key parasitoid of the fall armyworm Spodoptera frugiperda (J. E. Smith) during the second fi eld generation in the upper Magdalena River Basin, Colombia. In spite of selection pressure, the higher susceptibility of the second generation fall armyworm larvae to insecticides, compared with that of the fi rst generation, suggests that the parasitism may be responsible for the apparent difference in susceptibility. Parasitized and non-parasitized 2 nd -instar larvae of the fall armyworm were tested for susceptibility to chlorpyriphos, methomyl, cypermethrin, and Bacillus thuringiensis in the laboratory, using the leaf dip test. Parasitized larvae were up to 3.93 times more susceptible to chlorpyriphos, 3.71 times to methomyl, and 14.11 times to cypermethrin than non-parasitized larvae. The least effect of parasitism on susceptibility was found for B. thuringiensis. We discuss the negative infl uence of synthetic insecticide on the parasitoid population dynamics and its impact on insecticide resistance.

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The kariotype of the parasitoid Chelonus insularis Cresson (Hymenoptera, Braconidae, Cheloninae)

Cited by 2 publications

References 2 publications

A cytogenetic study of three parasitic wasp species (Hymenoptera, Chalcidoidea, Eulophidae, Trichogrammatidae) from Brazil using chromosome morphometrics and base-specific fluorochrome staining

A cytogenetic study of three parasitic wasp species (Hymenoptera, Chalcidoidea, Eulophidae, Trichogrammatidae) from Brazil using chromosome morphometrics and base-specific fluorochrome staining

Influence of parasitism by Chelonus insularis Cresson (Hymenoptera: Braconidae) on the susceptibility of Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) to insecticides

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