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Biol Bull 74: 99-107. (February 1938)
© 1938 Marine Biological Laboratory
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ON THE ENERGETICS OF DIFFERENTIATION. VII

COMPARISON OF THE RESPIRATORY RATES OF PARTHENOGENETIC AND FERTILIZED URECHIS EGGS

ALBERT TYLER 1 and N. H. HOROWITZ 1

1 From the William G. Kerckhoff Laboratories of the Biological Sciences, California Institute of Technology, Pasadena, California

1. Artificially activated eggs of Urechis respire at the same initial rate as do normally fertilized eggs.

2. The rate of respiration rises with time in the artificially activated eggs, but at a much slower rate than in the fertilized eggs.

3. The increase in respiratory rate with time is greater with cleaving than with non-cleaving parthenogenetic eggs.

4. Fertilized eggs in which cytoplasmic cleavage is inhibited and nuclear division retarded by means of phenylurethane give a retarded rise in respiratory rate, although the initial rate is the same as the control rate.

5. It is concluded that the delayed rise in respiration is linked with the slower development in all these cases.






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