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The Apis mellifera pupal melanization program is affected by treatment with a juvenile hormone analogue.

Abstract：

:Apis mellifera treated during different developmental phases with pyriproxyfen, a juvenile hormone analogue, show profound alterations in cuticular pigmentation and sclerotization. When the treatment is effected during the feeding phase of the fifth larval instar (LF5), the pupal development is blocked and pigmentation does not occur. Treatment of older larvae, at the spinning phase of the fifth larval instar (LS5), of prepupae (PP) or pupae at the beginning of the pupal period (Pw, white-eyed, unpigmented cuticle pupae) does not impair pigmentation, but, instead, this process is accelerated, intensified and abnormal. Hormonal treatment during these developmental phases (LS5, PP and Pw) induces earlier activity of phenoloxidase, an enzyme of the reaction chain leading to melanin synthesis. Treated pupae have significantly higher enzymatic levels and show a graded response in phenoloxidase activity after treatment with 0.1, 1 or 5&mgr;g pyriproxyfen. Besides pigmentation, other developmental events were also altered in treated bees: pupal development was shortened, and the expression of esterase-6 activity, the onset of which coincides with the beginning of pigmentation, was shifted with the precocious initiation of this process in treated pupae. The significance of these results is discussed in relation to the mode of hormonal action on cuticular pigmentation in insects.

journal_name

J Insect Physiol

journal_title

Journal of insect physiology

authors

Bitondi MM,Mora IM,Simões ZL,Figueiredo VL

doi

10.1016/s0022-1910(97)00113-3

keywords:

subject

Has Abstract

pub_date

1998-05-01 00:00:00

pages

499-507

issue

5-6

eissn

0022-1910

issn

1879-1611

pii

S0022191097001133

journal_volume

44

pub_type

杂志文章

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