title: Thyroid responses to altered photoperiod in the soft-shelled turtle Lissemys punctata punctata bonnoterre.
abstract: The aim of the current investigation was to investigate the effect of photoperiod on thyroid activity in soft-shelled turtles (Lissemys punctata punctata). Thirty days exposure of short photoperiod with 2L:22D increased relative weight, follicular epithelial height and peroxidase activity of the thyroid gland; whereas exposure of long photoperiod with 22L:2D for 30 days showed reversed changes to those of the short photoperiod in adult female turtles. These findings indicate that short photoperiod stimulates thyroid activity and long photoperiod inhibits its activity in soft-shelled turtles. It is suggested that photoperiod exerts its action on thyroid activity presumably via gonads and/or pineal-gonadal axis in turtles.
authors: Histophysiology Laboratory, Department of Zoology, University of Calcutta 35 Ballygunge Circular Road, Calcutta 700 019, India.
authors: Supriti
authors: S
authors: Sarkar
authors: Amita
authors: A
authors: Sengupta
authors: Santasri
authors: S
authors: Chaudhuri-Sengupta
authors: B R
authors: BR
authors: Maiti
mesh_terms: D000818:Animals; D001835:Body Weight; D004847:Epithelial Cells / Q000166:cytology; D005247:Feeding Behavior; D006984:Hypertrophy; D007194:India; D007453:Iodide Peroxidase / Q000378:metabolism; D009929:Organ Size; D017440:Photoperiod; D013961:Thyroid Gland / Q000473:pathology / Q000502:physiology*; D014426:Turtles / Q000033:anatomy & histology
chemical_list: D007453:Iodide Peroxidase