Odgovor neurosekretnih neurona gubara na nutritivni stres
The response of neurosecretory neurons to nutritive stress in Lymantria dispar L.
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The neuroendocrine system is the first link that reacts to environmental changes (Ivanović, Janković-Hladni 1991). Activity of neurosecretory neurons (nsn) determines the content of neurohormones which control dynamics of the methabolism and methamorphosis (Ivanović, Janković-Hladni 1991). Neuropeptides synthesized in the medial part of the insects’ protocerebrum include tropic factors regulating the synhesis of ecdysteroids (protoracicotropic factors- PTTH, Kawakami et al. 1990) and juvenile hormones - JHs (allatotropic factors- ATTH, Bogus, Scheller 1994) as well as number of neuropeptides modifying the rate and direction of metabolism (Raabe 1982). The knowledge on medial neurosecretory neurons is still incomplete in Lymantria dispar L. (Loeb, Hayes 1980). Our previous investigations on 5th instar larvae originated from differently adapted populations, have revealed significant population differences in the number and activity of neurosecretory neurons (Perić-Mataruga 1997). The present work is aimed to examine responses of A1 neurosecretory neurons to trophic stress (unsuitable host plant) in 4th instar gypsy moths.