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Juvenile hormone synthesis by ring glands of the blowfly Lucilia cuprina

✍ Scribed by P.D. East; T.D. Sutherland; S.C. Trowell; A.J. Herlt; R.W. Rickards

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
131 KB
Volume
34
Category
Article
ISSN
0739-4462

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✦ Synopsis

The major radiolabelled product released from ring gland and brain-ring gland complexes of third instar larval and pre-pupal stages of the sheep blowfly Lucilia cuprina upon incubation with L-[methyl-3 H]methionine corresponded to one diastereomer of juvenile hormone III bisepoxide (JHB 3 ). Endocrine glands incubated with the juvenile hormone precursor 2E,6E-farnesoic acid released increased quantities of JHB 3 , together with significant amounts of juvenile hormone III but not the isomeric methyl 2E-6,7-epoxyfarnesoate. Synthesis of JHB 3 was developmentally and neurally regulated. Ring glands and brain-ring gland complexes from third instar larvae released more JHB 3 than comparable preparations from pre-pupae, while isolated corpus allatum segments of the gland were more active than intact brain-gland complexes. These results reinforce the emerging status of JHB 3 as the characteristic juvenile hormone of dipteran insects.

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