STUDIES ON AMPHIBIAN METAMORPHOSIS. XI. DEVELOPMENT AND REGRESSION OF DERMAL PLICÆ FOLLOWING HOMOPLASTIC AND HETEROPLASTIC TRANSPLANTATION

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Abstract
Heteroplastic transplantation of potential dermal plicae (d. p.) integument was made between larvae of 3 species to ascertain possible development of dermal plicae structure during host metamorphosis. Results as follows: Rana catesbeiana to R. palustris[long dash]slight development; R. catesbeiana to R. clamitans[long dash]no development (grafts underwent considerable resorption); R. palustris to R. catesbeiana[long dash]no development (slight resorption of grafts). Homoplastic and heteroplastic transplantations of potential dermal plicae integument were made between larvae and newly-metamorphosed adults to determine whether the stimulus for dermal plicae development is retained following involution. Results were as follows: R. palustris to R. palustris[long dash]pronounced resorption of grafts in most cases, slight development in several cases where little resorption occurred; R. catesbeiana to R. palustris[long dash]in general, pronounced development, especially of mucous and poison glands. Transplantations of well-developed dermal plicae integument were made from newly-metamorphosed frogs to non-metamorphosing larvae to determine the stability of dermal plicae structure or its possible regression. Results were as follows: R. palustris to R. palustris[long dash]no regression, typical structure maintained; R. palustris to R. catesbeiana[long dash]very definite regression, no histological characteristics remaining in several cases. In general, it may be concluded that development is possible following heteroplastic transplantation providing pronounced integumentary histolysis does not occur. Post-involution growth and differentiation of dermal plicae structures are due to continued developmental influences present in the growing frog. R. palustris dermal plicae resist regression following homoplastic transplantation but are susceptible to regression following heteroplastic transplantation to non-involuting larvae.

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