The objective of the present investigation was to study the relationship between thyroid activity and reproductive cycle in turtle Lissemys punctata. The animals were studied in the annual seasonal cycle of reproduction for two consecutive years, which is distinguished into three separate periods namely regenerative, reproductive and recrudescent. The thyroid in L. punctata was observed to be a single pyramid shaped gland, creamy white to reddish-brown in color with lenticular profile. The diameter of the follicle was lowest in regenerative period, which
gradually increased in reproductive period attaining maximum size in recrudescent, where as epithelial height was highest in regenerative period, which gradually decreased in reproductive period reaching minimum in recrudescent period. Thyroid activity varies annually in relation to different phases of reproductive periods.
Plasma glucose, Season, Thyroid, Turtle
Chaudhuri, S. and Maiti, B.R. (1996). Changes in thyroid activity during the annual sexual cycle of a wild avian species, the tree pie Dendrocitta vagabunda. European Journal of Morphology, 34(4):321-324.
Chow, S.Y., Woodbury, D.M. and Yen-Chow, Y.C. (1990). Relation between pH regulation and iodide transport in turtle thyroid glands. Journal of Endocrinology, 127(1):85-101.
Das, I. (1995). Turtles and tortoises of India. World Wide Fund for Nature-India. Bombay, Delhi: Oxford University Press.
Gupta, B.B. and Thapliyal, J.P. (1985). Role of thyroid and testicular hormones in the oxidative metabolism of the Indian garden lizard, Calotes versicolor. General and Comparative Endocrinology, 58:20-7.
Hotchkiss, R.D. (1968). The Periodic Acid Schiff (PAS) Technique. In: A.G.E. Pearse (Ed.), Histochemistry theoretical and Applied (pp. 659-660), Edinburgh:Churchhill Living stone.
Hugenberger, J.L. and Licht, P. (1999). Characterization of thyroid hormone 5'-monodeiodinase activity in the turtle (Trachemys scripta). General and Comparative Endocrinology, 3(3):343-59.
Hulbert, A.J. and Williams, C.A. (1988).Thyroid function in a lizard, a tortoise and a crocodile, compared with mammals. Comparative Biochemistry and Physiology- Part A, 90(1):41-8.
Kohel, K.A., MacKenzie, D.S., Rostal, D.C., Grumbles, J.S. and Lance, V.A. (2001). Seasonality in plasma thyroxine in the desert tortoise, Gopherus agassizii. General and Comparative Endocrinology,121(2):214-22.
Licht, P., Denver, R.J. and Stamper, D.L. (1990). Relation of plasma thyroxine binding to thyroidal activity and determination of thyroxine binding proteins in a turtle, Pseudemys scripta. General and Comparative Endocrinology, 80(2):238-56.
Lynn, W. G. (1970). The thyroid. In: C. Gans and T. S. Parsons (Eds), Biology of the reptilian (pp 201-234), London, New York: Academic Press.
Machado, V.L., Wassermann, G.F. and Marques, M. (1991). In vitro effect of insulin on the uptake of glucose and alphaaminoisobutyric acid in the thyroid gland of the turtle (Chrysemys dorbigni). General and Comparative Endocrinology, 82(1):8-13.
Morris, Paula (2003). World chelonian trust website www.chelonia.org.
Sengupta, A., Sarkar, S., Chaudhuri, S.S., Prajna, P.R. and Maiti, B.R. (2004). Seasonal thyroid cycle of the soft-shelled turtle, Lissemys p. punctata (Bonnoterre). Biological Rhythm Research, 35:205-212.
Sinha, A.K. and Choubey, B.J. (1981). Seasonal changes in the thyroid gland of Indian spiny tailed, sand lizard, Uromastix hardwickii (Gray) male. Zellforsch Mikrosk Anatomy Forsch, 95(1):72-80.
Toda, S., Koike, N. and Sugihara, H. (2001). Cellular integration of thyrocytes and thyroid folliculogenesis: a perspective for thyroid tissue regeneration and engineering. Endocrine Journal, 48:407-425.
Trinder, P. (1969). Determination of blood glucose using oxidase peroxidase system with a non carcinogenic chromogen. Journal of Clinical Pathology, 22:158-161
This work is licensed under Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) © Author (s)