Abstract
1. 1. On the basis of the recently reported, photoacceleration of development in whole chick embryos in ovo; it was decided to investigate the effect of light and temperature on nucleoside phosphate levels in chick embryos in ovo. 2. 2. White Leghorn eggs of 8 and 9 days were exposed to either light (40 lumens/sq. ft) or dark in temperature and humidity controlled incubators at either 38 or 22°C before nucleoside phosphate estimation. Results indicated that whereas ATP levels were significantly lower under illumination, cold resulted in their elevation. ATP/ADP and ATP/AMP were higher both in cold and dark. An indication that ATP levels were lower in the 9-day as opposed to the 8-day embryo was also obtained. 3. It is suggested that the decrease in ATP on illumination may facilitate intercellular adhesion in the developing embryo, and thus result in the photo-acceleration of development. Increase in ATP on chilling may similarly result in development delay.
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