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Laser microbeam induction of incomplete doublets of Oxytricha fallax

Published online by Cambridge University Press:  14 April 2009

Gary W. Grimes
Gary W. Grimes
Affiliation:
Department of Zoology, Indiana University, Bloomington, Indiana, U.S.A. and Department of Biology, Hofstra University, Hempstead, New York

Summary

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Destruction by laser microbeam of oral and ventral cirral primordia for the future opisthe of 1/2 of a pre-fission doublet results in the permanent loss of ability to form oral and ventral cirral primordia on the irradiated half. This observation provides further evidence for the postulated ‘determinative region’ present on each ventral surface of these organisms. The opisthe of the irradiated doublet retains both original rows of marginal cirri, which are located mid-dorsally with respect to the remaining ventral surface. These two rows of marginal cirri are reproduced faithfully in all future opisthes, but are lost in most proter lines. The pattern of loss in proters involves migration of the extra rows of marginal cirri to the cell's right margin followed by aberrant morphogenesis and subsequent resorption. These results show that the reproduction of marginal cirri is at least partially dependent upon the presence of marginal cirri and their inherent structural characteristics as well as upon their position on the cell surface.

Type
Research Article
Information
Genetics Research , Volume 27 , Issue 2 , April 1976 , pp. 213 - 226
Copyright
Copyright © Cambridge University Press 1976

References

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