Effects of 5-HT (serotonin) on reproductive behaviour in Heterodera schachtii (Nematoda)

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Abstract:

The effects of serotonin (5-hydroxytryptamine or 5-HT) on the reproductive behaviour of Heterodera schachtii was examined. Male and juvenile H. schachtii were incubated in 5-HT for 15 min. Stylet thrusting was stimulated by 10 mM 5-HT, whereas 0.1 mM 5-HT was without effect. Prolonged treatment of males with 10 mM 5-HT induced eversion of the spicules and extrusion of materials from the reproductive tract. Treatment with 60 mM triethanolamine and Wright's stain indicated that extrusions did not contain spermatids or spermatozoa. We confirm the effects of 5-HT on reproductive behaviour and suggest that the stylet and pharynx may subserve a reproductive function during later life stages in H. schachtii.

Nous avons étudié les effets de la sérotonine (5-hydroxytryptamine ou 5-HT) sur le comportement reproducteur d'Heterodera schachtii. Des mâles et des juvéniles ont été mis en incubation dans de la 5-HT pendant 15 min. Une dose de 10 mM de 5-HT stimule la projection du stylet, alors qu'une dose de 0,1 mM n'a pas d'effet. Un traitement prolongé des mâles à 10 mM de 5-HT déclenche l'éversion des spicules et l'expulsion de matériel du tube digestif. Un traitement à 60 mM de triéthanolamine et au colorant de Wright indique que les substances expulsées ne contiennent ni spermatides, ni spermatozoïdes. Nous confirmons les effets de la 5-HT sur le comportement reproducteur et nous croyons que le stylet et le pharynx peuvent jouer un rôle secondaire dans la reproduction au cours des stades avancés chez H. schachtii.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: September 1, 2001

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  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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