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Quarterly Journal of Microscopical Science, Vol s3-92, 453-461, Copyright © 1951 by Company of Biologists

The Cytosome of differentiating Cells in the Ovotestes of Slugs

D. PELLUET 1 and ANNE H. G. WATTS 2

1 Zoological Laboratory, Dalhousie University, Halifax, Nova Scotin
2 Zoological Laboratory, Dalhousie University, Halifax, Nova Scotia

The distribution of ascorbic acid, alkaline phosphatase, and mitochondria has been followed during the differentiation of germinal epithelium cells into spermatogonia, oocytes, and nurse-cells in the ovotestes of slugs. All three substances appear in the cytoplasm of the oocyte and increase during its growth. Occasionally the oocyte nucleolus gives a positive test for ascorbic acid. The heads of the mature spermatozoa contain alkaline phosphatase. The cytoplasm of the germinal epithelium, spermatogonia, and spermatocytes occasionally gives a positive reaction for ascorbic acid. The development of the nurse-cells is accompanied by an increase in the size of the mitochondria. Attachment of the spermatids results in a decrease in size and number of the mitochondria in the nurse-cells. Alkaline phosphatase, ascorbic acid, and mitochondria show no significant change, either in form or quantity, in the indifferent cells of the ovotestis by which one could predict their destiny.






© The Company of Biologists Ltd 1951