Function of the neuroendocrine complex in diapausing Pyrrhocoris apterus females |
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Authors: | M Hodková |
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Institution: | Department of Insect Physiology, Entomological Institute, Czechoslovak Academy of Science, Na Folimance 5, 120 00 Praha, Czechoslovakia |
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Abstract: | The role of the brain in inhibiting the action of corpora allata in diapausing short-day females was investigated by transplantation experiments. The function of the transplanted glands was evaluated by oviposition. Active glands from long-day females remained active for a long period of time after transplantation into short-day females, although in situ corpora allata were inhibited shortly after the transfer of females from long to short day. Moreover, inactive glands from short-day females became active after transplantation into other short-day females. In contrast, corpora allata remained inhibited when transplanted together with the brain in the neuroendocrine complex (brain-corpora cardiaca-corpus allatum) where the nervous connections between the brain and corpus allatum remained intact. It is therefore suggested that short-day conditions inhibit corpora allata via nervous connections with the brain. |
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