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Title
Juvenile hormone titer versus juvenile hormone synthesis in female nymphs and adults of the German cockroach, Blattella germanica
AuthorTreiblmayr, Karl ; Pascual, Nuria ; Piulachs, Maria-Dolors ; Keller, Thomas ; Belles, Xavier
Published in
Journal of Insect Science, Oxford, 2006, Vol. 6, Issue 1, page 1-7
PublishedOxford University Press, 2006
LanguageEnglish
Document typeJournal Article
Keywords (EN)hemolymph juvenile hormone titer / CA corpora allata / JH juvenile hormone
ISSN1536-2442
URNurn:nbn:at:at-ubs:3-6259 Persistent Identifier (URN)
DOI10.1673/031.006.4301 
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 The work is publicly available
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Juvenile hormone titer versus juvenile hormone synthesis in female nymphs and adults of the German cockroach, Blattella germanica [0.25 mb]
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Abstract (English)

Patterns of juvenile hormone have been intensively studied in the cockroach Blattella germanica under different physiological situations. However, data have been mainly obtained in vitro, and refer to hormone synthesized by isolated corpora allata, whereas information available on hormone concentration in the hemolymph is restricted to adult females. In order to complement our studies in vitro, we have measured juvenile hormone titer in the hemolymph of B. germanica females in four characteristic physiological situations: penultimate and last instar nymphs, adults during the first vitellogenic cycle, and adults transporting egg cases (ootheca). In general, a significant positive correlation between rates of hormone synthesis and concentration in the hemolymph is observed. The main disparities appear in the penultimate day of the period of ootheca transport, where titer is high whereas synthesis is low, and on day 6 of the first vitellogenic cycle, where synthesis increases whereas titer decreases. At these stages, the observed disparities between synthesis and titer might be explained by differential action of degradation enzymes.

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