Dependence of the parasitoid Gonia cinerascens on the hormones of its lepidopterous hosts

Baronio, Piero; Sehnal, František

doi:10.1016/0022-1910(80)90031-1

Cited by 47 publications

(18 citation statements)

References 20 publications

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“…In Tachinidae, many species (P. rufifrons, Pseudoperichaeta nigrolineata, and A. marmoratus) exhibit a high degree of physiological integration with their host. The development of these species is dependent on host hormones because their first-instar larvae have to wait until the host larva has reached maturity or is in the pupal stage before molting to second instar (Baronio and Sehnal, 1980;Grenier, 1988b). As a consequence, the duration of their larval development is widely influenced by host age at parasitization (Mellini, 1986).…”

Section: Host-parasitoid Interactionsmentioning

confidence: 99%

Production of Dipteran Parasitoids

Dindo¹,

Grenier²

2014

Mass Production of Beneficial Organisms

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Section: Host-parasitoid Interactionsmentioning

confidence: 99%

Production of Dipteran Parasitoids

Dindo¹,

Grenier²

2014

Mass Production of Beneficial Organisms

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“…Likewise, the larval development of the tachinids EucarceIia rutilla Vill. and P. cinerascens is dependent on changing levels of hormones in their hosts (Schoonhoven, 1962;Baronio & Sehnal, 1980;Fanti & Bratti, 1991).…”

Section: Discussionmentioning

confidence: 99%

Regulation of Helicoverpa zea larval behavior by the parasitoid Eucelatoria bryani

Reitz

Nettles

1994

Entomologia Exp Applicata

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The parasitoid Eucelatoria bryani Sabrosky regulates the larval behavior of its host Helicoverpa zea (Boddie). Parasitized third, fourth and fifth instars burrow into the soil 0.7-3.4 days earlier than unparasitized larvae that normally enter the soil to pupate at the end of the fifth and final larval instar. Parasitized third instars molt once then burrow as fourth instars, one instar earlier than normal. When E. bryani pupariated on the soil surface in the field, none survived to the adult stage. However, E. bryani adults emerged from 49.2~o of hosts that had burrowed into the soil. By accelerating the timing ofH. zea burrowing behavior and causing host larvae to enter the soil before death, E. bryani ensures its pupariation in an environment with improved protection against natural enemies and lethal temperatures.

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“…It is conceivable that the degree of endocrine dependence on the host decreases in the course of the parasitoid's development. The tachinid Gonia ciizerascens appears to depend on exogenous ecdysteroids in its 1st larval instar but no longer in its 2nd instar [21]. Molting of the braconid Biosteres longicaudatus to the 2nd instar was also seen to depend on exogenous ecdysteroids in vivo [22] and in vitro [23].…”

Section: Edcysteroids and Jh In Late Larval Development Of Chelonus Amentioning

confidence: 99%

Endocrine interrelationship between the parasitoid Chelonus sp. and its host Trichoplusia ni

Grossniklaus-Bürgin

Lanzrein

1990

Arch Insect Biochem Physiol

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The egg-larval parasitoid Chelonus sp. induces the precocious onset of metamorphosis in the 4th (penultimate) stadium of its host Trichoplusia ni, emerges from the prepupa, and then feeds on it. Qualitative and quantitative changes in ecdysteroids and juvenile hormone were measured. Hemolymph of 3rd-to 4th-instar host larvae and the parasitoids they contained, as well as nonparasitized and parasitized eggs, were analyzed. In the host hemolymph a broad peak of ecdysteroids during molting into the 4th stadium and a continuous increase from day 2 (onset of precocious wandering) until day 4 (emergence of parasitoid) were observed; 20-hydroxyecdysone and 20,26-dihydroxyecdysone were predominant. The juvenile hormone titer fluctuated in the 3rd and early 4th stadium and fell to undetectable levels shortly before the precocious onset of wandering. The parasitoid's ecdysteroids started to increase on the molt to the 2nd instar (= early 4th instar of the host) and thereafter fluctuated on a high level, 20-hydroxyecdysone, 20,26-dihydroxy-ecdysone, and ecdysone being predominant. The juvenile hormone titer was high in late 1st-instar parasitoids, decreased to low levels at ecdysis into the 2nd instar, and increased again to high levels in the 2nd-instar larvae at the time when their shape changed from flat to cylindrical. After ecdysis to the 3rd instar the juvenile hormone titer fell. A comparison revealed that both ecdysteroids and juvenile hormone fluctuate independently in parasitoid and host at most stages, suggesting that the parasitoid produces its own hormones. The first data on ecdysteroids and juvenile hormones in the egg stage of a parasitoid/host system are reported. At the stage of eye pigmentation parasitized eggs contained more immunoreactive midpolar ecdysteroids than non-parasitized ones. 20-Hydroxyecdysone and 20,26-dihydroxyecdysone were the predominant ecdysteroids in both nonparasitized and parasitized eggs, but the latter contained several additional ecdysteroids which were not seen in nonparasitized eggs. The titer of juvenile hormone was similar in both. Shortly before hatching the ecdysteroids were low in parasitized and nonparasitized eggs, but the content of juvenile hormone was much higher in the former. At this stage the majority of parasitoids have already eclosed and teratocytes are released. The results of HPLC analysis indicated the presence of juvenile hormone III together with juvenile hormones I and II in parasitized eggs, but only juvenile hormones I and II in nonparasitized eggs.

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Dependence of the parasitoid Gonia cinerascens on the hormones of its lepidopterous hosts

Cited by 47 publications

References 20 publications

Production of Dipteran Parasitoids

Production of Dipteran Parasitoids

Regulation of Helicoverpa zea larval behavior by the parasitoid Eucelatoria bryani

Endocrine interrelationship between the parasitoid Chelonus sp. and its host Trichoplusia ni

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