ANAEROBIC GLYCOLYSIS IN AMPHIBIAN DEVELOPMENT

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Abstract
R. pipiens embryos, and gastrula-arrested embryos obtained by fertilizing R. pipiens eggs with R. sylvatica sperm, glycolyze anaerobically without initial lag. No lactic acid is produced aerobically. Embryos of both types sustain the initial rate of glycolysis for at least one hour, at any stage of development. Development of glycolysis in R. pipiens embryos occurs in two phases: one of constant rate (0 - 59 hrs.), the other of exponentially increasing rate (59-140 hrs.). Glycolytic rates of hybrid embryos decline from the normal control rate at fertilization to about one-fifth of the control rate at early neurulation, then increase to about one-eleventh of the control rate at hatching.