Parasitic castration of Pseudaletia separata by Cotesia kariyai and its association with polydnavirus gene expression

Tagashira, Eiko; Tanaka, Toshiharu

doi:10.1016/s0022-1910(98)00006-7

Cited by 11 publications

(9 citation statements)

References 27 publications

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“…After injection of CkBV plus venom into Pseudoletia separata, abnormal chromosomes in specific germ cells were observed and mimicked the effects of natural parasitization on the testes (Tanaka et al, 1994). These results suggested the possibility that specific stages of the germ cells might be affected by CkBV plus venom (Tagashira and Tanaka, 1998).…”

Section: Introductionmentioning

confidence: 63%

“…Testicular volumes were calculated using the formula V 5 p/4 (L W T) (L 5 length, W 5 width, and T 5 thickness of the testis) (Tagashira and Tanaka, 1998). Ten larvae were chosen to calculate their testicular volumes for each determination.…”

Section: Evaluation Of Testicular Growthmentioning

confidence: 99%

“…The amount of Cotesia kariyai bracovirus (CkBV) gene expression in host testes increased immediately and reached a maximum 12 h after parasitization. It is suggested that the products of early-expressed PDV gene(s) are involved in affecting host castration (Tagashira and Tanaka, 1998).…”

Section: Introductionmentioning

confidence: 99%

“…However, only few studies of parasitic castration in endoparasitoid-insect host systems have been reported (Tagashira and Tanaka, 1998), and so far castration dealing with immature stages is understudied. In the systems studied to date, parasitization causes testes to atrophy Tagashira and Tanaka, 1998;Yagi and Tanaka, 1992). The number of developing germ cells is reduced and the structural integrity of the testis sheath is compromised .…”

Section: Introductionmentioning

confidence: 99%

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Parasitic castration of Plutella xylostella larvae induced by polydnaviruses and venom of Cotesia vestalis and Diadegma semiclausum

Bai

Dong-zhang

2008

Arch Insect Biochem Physiol

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In the present study, we used gamma-ray to irradiate the female parasitoids to make wasp eggs infertile, resulting in pseudoparasitization, which allowed the analysis of maternal secretions such as polydnaviruses (PDVs) and venom in the absence of larval secretions or teratocytes by the growing parasitoids. We then investigated the spermatogenesis and components of testicular proteins of male Plutella xylostella larvae pseudoparasitized by two endoparasitoids (Cotesia vestalis and Diadegma semiclausum). The results showed that pseudoparasitism by the two endoparasitoids at the early third instar host larvae both induced smaller testes in size than those of nonparasitized host larvae. Both of them caused parasitic castration, and the degree of castration is almost as severe as in naturally parasitized hosts. This suggested that PDVs and venom played a major role in the degeneration of host testes. There are significant differences in the degree of castration induced by the two endoparasitoids, with respect to testicular growth, testicular protein concentrations, and histological changes of germ cells. Cotesia vestalis bracovirus always has a significantly stronger effect on host testicular growth and development than D. semiclausum ichnovirus. SDS-PAGE analysis indicated that synthesis of P 65 and P 67 proteins were clearly inhibited in testes of hosts that were pseudoparasitized by C. vestalis while reduction in synthesis of other proteins was not evident.

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Section: Introductionmentioning

confidence: 63%

Section: Evaluation Of Testicular Growthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Parasitic castration of Plutella xylostella larvae induced by polydnaviruses and venom of Cotesia vestalis and Diadegma semiclausum

Bai

Dong-zhang

2008

Arch Insect Biochem Physiol

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“…By rejecting virus‐free parasitized hosts (PP‐hosts), the parasitoid avoided wasting eggs, as only one M. rufiventris larva is able to develop per host ( Hegazi et al., 1989). It is known that the endoparasitoids induce a variety of physiological and behavioural changes in hosts during the course of development ( Vinson and Iwantsch , 1980; Beckage et al., 1987; Doucet and Cusson , 1996; Tagashira and Tanaka , 1998; Trudeau and Strand , 1998). Perturbations in host development have often been attributed to factors injected by the ovipositing parasitoids ( Stoltz , 1986).…”

Section: Discussionmentioning

confidence: 99%

Ovipositional discrimination by Microplitis rufiventris females between healthy and granulosis virus‐infected Spodoptera littoralis larvae

Hegazi

Abd-Allah²

2004

J Applied Entomology

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Ovipositional choice tests by Microplitis rufiventris females (Hym., Braconidae) between granulosis virus‐infected (GVI) and non‐infected (NI) Spodoptera littoralis larvae (Lep., Noctuidae), were assessed using discriminatory methods for re‐isolating the NI and virus‐infected hosts after removing the female parasitoid. When M. rufiventris females were given a choice between NI and GVI S. littoralis hosts, the adult females exhibited marked preference (P < 0.01) for the NI (i.e. higher quality) hosts. In this case, M. rufiventris females and S. littoralis GV (SlGV) did not significantly compete for the same type of host larvae and are, generally, compatible. However, when the choice was given between two low qualities of S. littoralis hosts, i.e. virus‐free previously parasitized hosts and viral‐infected hosts a significant preference (P < 0.01) of the parasitoid females for the GVI larvae was observed. In this case, the parasitoid would be at a disadvantage when competing with GV for the same host. However, the parasitoid could be used as an additional tool for the dissemination of biocontrol viruses within different pest populations, i.e. hosts other than S. littoralis. Importantly, the results showed different strategies of parasitoid female in egg‐laying management. When M. rufiventris female was given a choice between healthy and SlGVI hosts, the female deposited more eggs than when she was given a choice between two low qualities of host larvae. The results of the study may have implications in pest management strategies using M. rufiventris and SlGV against S. littoralis larvae.

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References

2014

The Braconid and Ichneumonid Parasitoid Wasps

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Parasitic castration of Pseudaletia separata by Cotesia kariyai and its association with polydnavirus gene expression

Cited by 11 publications

References 27 publications

Parasitic castration of Plutella xylostella larvae induced by polydnaviruses and venom of Cotesia vestalis and Diadegma semiclausum

Parasitic castration of Plutella xylostella larvae induced by polydnaviruses and venom of Cotesia vestalis and Diadegma semiclausum

Ovipositional discrimination by Microplitis rufiventris females between healthy and granulosis virus‐infected Spodoptera littoralis larvae

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