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1 September 2004 Experimentally Induced Autotetraploidy and Allotetraploidy in Two Japanese Pond Frogs
Yasuyuki Kondo, Akihiko Kashiwagi
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Abstract

We examined cytogenetic features and reproductive capacity in newly arisen tetraploid amphibians. Autotetraploids were produced by suppressing second polar body formation in haploid eggs of diploid females of Rana nigromaculata inseminated with diploid sperm of autotetraploid R. nigromaculata. Allotetraploids were also produced by suppressing second polar body formation in haploid eggs of diploid females of Rana porosa brevipoda inseminated with diploid sperm of autotetraploid R. nigromaculata. In male R. nigromaculata autotetraploid offspring, mostly quadri- and bivalents were found in Metaphase I, and 26 dyads were seen in Metaphase II. Autotetraploid males were then mated with autotetraploid females, and most of the resultant offspring were tetraploids possessing four chromosome sets of diploid R. nigromaculata. Male allotetraploid offspring showed 26 bivalents in Metaphase I and 26 dyads in Metaphase II. A large number of the offspring resulting from crosses between allotetraploid males and females were tetraploids having chromosome sets of diploid R. nigromaculata and diploid R. p. brevipoda. These results seem to indicate that, if such tetraploids develop a distinguishing premating mechanism, they should continue as a sexual fertile species in one generation and coexist with their diploid parental species.

Yasuyuki Kondo and Akihiko Kashiwagi "Experimentally Induced Autotetraploidy and Allotetraploidy in Two Japanese Pond Frogs," Journal of Herpetology 38(3), 381-392, (1 September 2004). https://doi.org/10.1670/160-02A
Accepted: 1 May 2004; Published: 1 September 2004
JOURNAL ARTICLE
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