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Effects of temperature on shortening of isolatedRana pipiens tadpole tail tips

✍ Scribed by Fry, Anne E.

Publisher
John Wiley and Sons
Year
1972
Tongue
English
Weight
834 KB
Volume
180
Category
Article
ISSN
0022-104X

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✦ Synopsis

To determine how temperature influences the rate of amphibian metamorphosis when acting directly on peripheral tissues, Rana pipiens tail tips from larval stages 11-IV were cultured in the presence of 1 X 10-6 M or 1 X lo-' M DL-thyroxine at four different temperatures: 5"C, 10Β°C, 20"C, and 26" C. Five experiments were performed with variations in temperature, length of exposure to, and concentration of, hormone.

Results indicate a positive correlation between temperature and rate of tail shortening in uitro, thus demonstrating that temperature can influence metamorphosis by acting on the periphery directly in addition to its effect on the hypothalamus-pituitary-thyroid axis. Low temperatures retard or inhibit shortening of isolated tails both by decreasing thyroxine uptake and by influencing its action after it is within the tail. Length of exposure to hormone and concentration also affect the rate of resorption.

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