Hybridogenetic Reproduction of Allotriploids between Japanese and European Pond Frogs(Developmental Biology)
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概要
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A few male and female allotriploids were obtained from crossings between female Rana brevipoda from Japan and male Rana lessonae from Italy, together with abundant diploid hybrids. Many male and female allotriploids were also produced from the same crossings by refrigerating eggs after insemination. The allotriploids were constructed of two Rana brevipoda genomes and one Rana lessonae genome. The oocytes of mature female allotriploids contained 13 bivalents consisting of Rana brevipoda chromosomes, while the Rana lessonae chromosomes were eliminated from the oocytes. In the testes of mature male allotriploids, the seminiferous tubules were filled with bundles of normal spermatozoa as in the case of the testes of diploid male Rana brevipoda. The offspring of male allotriploids backcrossed with female Rana brevipoda were completely of Rana brevipoda type at the tadpole and adult stages. Almost all the offspring were diploids and females. They were the same as diploid Rana brevipoda in the electrophoretic patterns of serum proteins, hemoglobin and various kinds of enzymes extracted from skeletal muscles. All the above findings indicate that the male and female allotriploids made hybridogenetic reproduction in the sense that the two Rana brevipoda genomes form 13 bivalents and produced haploid gametes by normal meiosis after the single Rana lessonae genome was eliminated. Albinic offspring appeared from backcrossings of some male allotriploids with albinic diploid female Rana brevipoda (B^aB^a). These male allotriploids were considered to have been raised from unreduced ova of female Rana brevipoda which were heterozygous for an albinic gene by fertilization with sperm of male Rana lessonae and to be B^A*B^aL and B^aB^aL in gene constitution.
- 社団法人日本動物学会の論文
著者
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Nishioka Midori
Laboratory For Amphibian Biology Faculty Of Science Hiroshima University
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OHTANI Hiromi
Laboratory for Amphibian Biology, Faculty of Science, Hiroshima University
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Ohtani Hiromi
Laboratory For Amphibian Biology Faculty Of Science Hiroshima University
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