Adaptive Variability of the Gustatory System Receptor Partof the Carp Cyprinus carpio (Cyprinidae, Teleostei) after Chronic Anosmiaстатья
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Дата последнего поиска статьи во внешних источниках: 14 ноября 2016 г.
Аннотация:Abstract—To confirm the existence in fish of the olfactogustatory interactions of adaptive signifi
cance, the study was performed of reactions of the receptor part of the carp gustatory system to the
complete olfactory deafferentation with use of the method of scanning electron microscopy. Pecu
liarities of morphological changes of the taste receptor apparatus of the external and oral localiza
tion were revealed, and the dynamic of development of the taste receptor adaptive changes was
traced for 1–9 months after production of anosmia. Receptors of the intraoral gustatory system had
reactions of low statistical significance which were delayed in time by 5–6 months. The receptor
apparatus of the external gustatory system receptors of the intraoral taste system showed pronounced
hypertrophic changes that appeared since 2–3 months after the beginning of anosmia. The changes
consisted in an increase of the area of the taste bud (TB) sensory field and of their number in the
sensory zones of the maxillary and mandibular parts. The taste receptors located in the maxillary
barbels and in the mandible gular zone had the most expressed reactions to the olfactory deafferen
tation. In the fish with anosmia, formation of the additional structures of the “external taste” was
detected in the form of epidermal processes under the lower lip, which were covered with taste pa
pillae. Thus, it has been shown that the fish olfactory and gustatory systems are functionally interre
lated; under conditions of olfactory deprivation the external gustatory system is able to undergo
compensatory morphofunctional changes aimed at vicariation of the lost distant chemical recep
tion.