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An experimental study of lens regeneration in Triturus virides-cens viridescens II Lens development from the dorsal iris in the absence of the embryonic lens


An experimental study of lens regeneration in Triturus virides-cens viridescens II Lens development from the dorsal iris in the absence of the embryonic lens



Jour Exptl Zool 113(2): 317-353



DOI: 10.1002/jez.1401130205

In order to prevent the development of the embryonic lens, 152 operations were performed in which the prospective lens ectoderm of T. viridescens embryos at neurula and early head and tail-bud stages was replaced by flank ectoderm from Amblystoma punctatum embryos at the latter stage. The hosts were cultured for 1 to 73 days and killed at intervals for study in serial sections. Lens induction from the Amblystoma flank ectoderm failed to occur so that most of the operated eyes developed without a lens. However, in some cases, a lens was found which apparently had developed from incompletely removed prospective lens ectoderm. Morphogenesis in the lensless eyes was not quite normal, even in the best cases. This resulted in eyes with thickened retina, shallow vitreous chamber, absent anterior chamber, thicker iris, retarded cornea formation and, frequently, retinal folds. In 21 cases, successive stages in the development of a lens from the dorsal iris were found. These were identical with those previously observed following extirpation of the larval lens. However, they did not appear until the embryo had reached stage 46, 14 to 16 days after the operation. It can be concluded that, when lens induction from the supraocular ectoderm fails to occur in Triturus, a lens will be supplied later from the dorsal iris, but not until an early larval stage has been attained.

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Accession: 030025222

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Related references

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