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Effects of juvenile hormone and molting hormone on rectal pad development in Hyalophora cecropia (L.)
Author(s) -
Judy Kenneth J.,
Gilbert Lawrence I.
Publication year - 1970
Publication title -
journal of morphology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 74
eISSN - 1097-4687
pISSN - 0362-2525
DOI - 10.1002/jmor.1051310305
Subject(s) - juvenile hormone , cecropia , biology , hormone , hindgut , medicine , endocrinology , moulting , juvenile , lepidoptera genitalia , larva , botany , ecology , midgut
The histology of the rectal pads was examined in H. cecropia that had been injected as pupae with juvenile hormone or molting hormone. The appearance of the rectal tissues was related to the degree of imaginal differentiation which in turn depended on the dose of juvenile hormone applied. Juvenile hormone inhibits the division of the small hindgut cells that normally form the general rectal wall of the adult. High doses totally suppress the differentiation of the cortical cells. The medullary cells are very sensitive to juvenile hormone even in animals in which the external morphology is only slightly affected. Relatively high doses of molting hormone result in the formation of large, elongate complexes of cortex cells. These are more typical of primitive insects than of Lepidoptera.