Summary
The exact localization of the presumptive trunk organizer was determined by means of vital staining at the initiation of gastrulation (0 h embryo) and subsequently in 6, 9, 12 and 24 h embryos.
The progressive changes in the self-differentiation and inductive capacity of the trunk organizer were studied in isolation cultures (sitting drop) and in sandwich cultures with competent gastrula ectoderm. In the 0 and 6 h embryo cultures the excised trunk organizer predominantly formed atypical ectoderm. A dramatic change in differentiation and inductive capacity occurred in the 9 h embryo. The positive cases — 83% of the isolation and 50% of the sandwich cultures — mainly formed notochord and somites, accompanied by spinal cord and hindbrain in the sandwich cultures. Although no further change in self-differentiation occurred from that time onwards, a gradual increase in inductive capacity was recognized.
Similar content being viewed by others
References
Hama, T.: Dynamics of the organizer. B. New findings on the regionality and morphogenetic movement of the organizer. In:Organizer — A milestone of a half-century from Spemann (O. Nakamura and S. Toivonen, eds.), pp. 71–90. Amsterdam, Oxford, New York: Elsevier/ North-Holland Biomedical Press 1978
Holtfreter, J.: Differenzierungspotenzen isolierter Teile der Urodelengastrula. Wilhelm Roux' Archiv.138, 522–656 (1938)
Holtfreter-Ban, H.: Differentiation capacity of Spemann's organizer investigated in explants of diminishing size. Ph. D. Thesis. Ann Arbor, Mich.: University Michigan 1965
Kato, K.I.: Studies on the differentiating potencies of the dorsal part of the blastoporal lip inTriturus-gastrula. I. Differentiation of mesodermal tissues in relation to the neural tissue. Mem. Coll. Sci. Kyoto Univ., Ser. B25, 1–10 (1958)
Kato, K.I.: Studies on the differentiating potencies of the dorsal part of the blastoporal lip inTriturus-gastrula. II. On the differentiation of notochord. Mem. Coll. Sci. Kyoto Univ., Ser. B26, 1–7 (1959)
Nakamura, O.: Die Entwicklung der hinteren Körperhälfte bei Urodelen. Annot. Zool. Jap.21, 169–239 (1942)
Okada, Yô K., Hama, T.: Examination of regional differences in the inductive activity of the organizer by means of transplantation into ectadermal vesicles. Proc. Imp. Acad. (Tokyo)19, 48–53 (1943)
Spemann, H.: Über den Anteil von Implantat und Wirtskeim an der Orientierung und Beschaffenheit der induzierten Embryonalanlage. Wilhelm Roux' Archiv.123, 390–516 (1931)
Suzuki, A., Kuwabara, K., Kuwabara, Y.: Temporal relation between extension of archenteron roof and realization of neural induction during gastrulation of newt embryo. Develop. Growth Diff.17, 343–353 (1975)
Vogt, W.: Gestaltungsanalyse am Amphibienkeim mit örtlicher Vitalfärbung. II. Gastrulation und Mesodermbildung bei Urodelen und Anuren. Wilhelm Roux' Archiv.120, 384–706 (1929)
Yamada, T.: Embryonic induction. In:A symposium on the chemical basis of development (W. McElroy and B. Glass, eds.), pp. 217–238. Baltimore: John Hopkins Press 1958
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Kanéda, T., Hama, T. Studies on the formation and state of determination of the trunk organizer in the newt,Cynops pyrrhogaster . Wilhelm Roux' Archiv 187, 25–34 (1979). https://doi.org/10.1007/BF00848164
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00848164