The Involvement of Interoceptive Chemosensory Activity in the Nervous Regulation of the Prothoracic Gland in a Moth, Mamestra brassicae : Physiology

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Histidine-rich and trehalose-rich saline was applied to the isolated nervous system connected with the prothoracic gland (PTG) of the moth Mamestra brassicae. These salines produced a marked elevation of the afferent electrical activity in the nerve 4 to PTG and consequently a strong depression of the efferent activity. It is concluded that the afferent neurones in the nerve N4 are chemosensory and function as a sensor to monitor the histidine or trehalose concentration in the external medium. Further, the input from the afferent neurones must disinhibit the inhibitory function of the efferent neurones to PTG. The comparison these results with the determination of the change in sugar contents in the haemolymph during the larval development, suggests that it is the elevation of the trehalose concentration in the haemolymph during the progress of the development which, via the involvement of the afferents in N4, finally induces the accelerated ecdysteroid synthesis or release at PTG.
社団法人日本動物学会の論文
1989-10-15