Influence of continuous light and darkness on the secretory pinealocytes of<Emphasis Type="Italic">Heteropneustes fossilis</Emphasis> |
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Authors: | S Srivastava |
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Institution: | (1) Department of Zoology, University of Delhi, 110 007 Delhi, India |
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Abstract: | In an earlier study onHeteropneustes fossilis, evidence of secretory activity in the pinealocytes had been demonstrated at the electron microscopic (EM) level and it was
found to exist in two phases: a secretory phase (light cells) and a storage phase (dark cells). In the present investigation,H. fossilis was subjected to artificial photoperiods of continuous illumination and continuous darkness for a period of ten days and
the effect on the secretory pinealocytes was studied at the EM level. Marked results were observed within the short period
of ten days emphasizing the role of environmental photoperiod on the secretory activity of the pinealocytes. During continuous
illuminated phase, both light and dark cells were observed: the light cells showed intense secretory activity and dark cells
a storage one. During the dark phase both types of cells were present but in different metabolic states and neither of the
cells demonstrated synthetic nor storage activity. Light cells were metabolically active but not secretory active and dark
cells showed a necrotic condition. Phagocytotic activity of the dark cells was also seen. Intense neural activity was also
observed during exposure to both the artificial photoperiods. The results highlight the role of light on the secretory activities
of the pinealocytes of the catfish pineal organ. |
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Keywords: | Artificial photoperiod dark cell light cell pineal secretory pinealocytes synapse |
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