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Enhancement by farnesol and farnesoic acid of juvenile‐hormone biosynthesis in induced low‐activity locust corpora allata
Author(s) -
Couillaud Franck,
Mauchamp Bernard,
Girardie Adrien,
de Kort Stan
Publication year - 1988
Publication title -
archives of insect biochemistry and physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.576
H-Index - 66
eISSN - 1520-6327
pISSN - 0739-4462
DOI - 10.1002/arch.940070206
Subject(s) - corpus allatum , farnesol , juvenile hormone , biosynthesis , medicine , endocrinology , biology , locust , incubation , vitellogenesis , biochemistry , hormone , oocyte , enzyme , botany , embryo , microbiology and biotechnology
Exogenous farnesol or farnesoic acid (FA) stimulates juvenile hormone III (JH III) biosynthesis by isolated corpora allata from Locusta migratoria in a dose‐dependent manner. Farnesol and FA also stimulate a dose‐dependent accumulation of substantial amounts of methyl farnesoate (MF), identified by gas chromatography‐mass spectroscopy (GCMS) analysis, in the corpora allata. Lower quantities of MF were found in the incubation medium. Corpora allata, denervated 2 days prior to assay, showed low spontaneous rates of JH biosynthesis which were stimulated by farnesol and FA. The dose‐response curves for control and denervated corpora allata were similar. During oocyte maturation the rate of farnesol and FA stimulation of JH biosynthesis increased gradually. However, after transection of nervus corporis allati 1 (NCA‐1), the rate of stimulated JH synthesis was maintained at preoperative levels. Although the spontaneous rate of JH biosynthesis decreased rapidly after NCA‐1 transection, denervated glands could still be stimulated by farnesol or FA to produce large amounts of JH. These results suggest that the low spontaneous rate of JH biosynthesis in denervated corpora allata is not caused by inhibition of the final steps of JH biosynthesis.