PMID: 12769927Feb 19, 1997Paper

Inhibition of testicular growth and development in Manduca sexta larvae parasitized by the braconid wasp Cotesia congregata

Journal of Insect Physiology
Nancy E Beckage, D A. Reed

Abstract

Tobacco hornworm larvae parasitized by the gregarious larval endoparasitoid Cotesia congregata exhibited an inhibition in testicular growth and development, the extent of which was determined by the age and developmental stage of the host at the time of parasitization. The degree of parasitic castration, as assessed by measurements of testicular volume, was correlated with the stadium in which parasitization occurred. A mathematical formula requiring the measurement of testicular length, width and depth was used to calculate testicular volume. The use of the depth parameter revealed a negative correlation between host weight and testicular volume in parasitized larvae. Testicular volumes of fifth instar hosts, which had been parasitized in the first stadium, were significantly smaller than those originally parasitized as fourth or fifth instar larvae and were not correlated with parasitoid load. Effects of natural parasitism were not duplicated by injections of C. congregata polydnavirus and venom, topical treatment with the juvenile hormone analog methoprene, or starvation of nonparasitized larvae. Larvae receiving virus plus venom or methoprene grew larger due to delayed wandering and had larger testes than controls. Deleteri...Continue Reading

References

Jul 1, 1982·General and Comparative Endocrinology·N E Beckage, L M Riddiford
Jan 1, 1956·Experimental Parasitology·E G REINHARD
Jan 1, 1996·Annual Review of Entomology·D Wheeler
Oct 1, 1995·Parasitology Today·M D Lavine, N E Beckage

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Citations

Sep 1, 2005·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·S N Thompson, R A Redak
Jan 16, 2007·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·S N Thompson, R A Redak
Jan 16, 2008·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·S N Thompson, R A Redak
May 29, 2003·Journal of Insect Physiology·D L. Dahlman, S N. Thompson
May 10, 2000·Journal of Insect Physiology·M C DigilioF Pennacchio
May 6, 2008·Microscopy Research and Technique·Fang HuangXue-Xin Chen
Apr 14, 2018·Scientific Reports·Tomáš VendlLukáš Kratochvíl

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