Abstract
Stereological principles were applied to an electron microscopic study of the Golgi apparatus in different developmental stages of normal and hybrid Rana embryos. Hybrid blastulae showed levels of Golgi material that were elevated 4.3–5.0 times when compared to the normal. Golgi content increased 2–4-fold with the onset of gastrulation in normals. Following the onset of gastrulation, numbers and amounts of Golgi material probably do not change in cells of normal embryos. During the equivalent period in arrested embryos, the Golgi content in cells of pipiens × catesbeiana hybrids decreased by more than one-third. During late gastrulation or arrest, the dictyosome population moved into association with the cell surfaces in normal and pipiens × catesbeiana hybrid embryos. During arrest, pipiens × esculenta hybrids exhibited dictyosome clumping about nuclei. The significance of these changes is discussed with respect to the role of the Golgi apparatus in amphibian gastrulation.
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