Allopentaploids and Allohexaploids between Rana nigromaculata and Rana plancyi chosenica

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概要

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• Allopentaploids and allohexaploids were produced between Rana nigromaculata, (N)NN, and Rana plancyi chosenica, (C)CC, in order to clarify their viability, sexual ratio and reproductive capacity. The allopentaploids, (N)NNNCC or (N)NNCCC, were obtained from female amphidiploids, (N)NNCC, between these two species by suppressing the extrusion of the second polar body by refrigeration of eggs after insemination with sperm of R. nigromaculata or R. plancyi chosenica. Allohexaploids, (N)NNNCCC, were obtained from amphidiploids, (N)NNCC, by suppressing the extrusion of the second polar body by refrigeration of eggs after insemination with sperm of male amphidiploids, (N)NNCC. In eight experimental series, (N)NNCC♀×(N)NN♂, with cold-treatment of eggs, 255 (6.1%) of 4163 eggs became normally feeding tadpoles. Of 178 analyzed tadpoles, 138 (77.5%) were allopentaploids, (N)NNNCC, 100 completed metamorphosis and 52 attained sexual maturity. There were seven females and 45 males. In five experimental series, (N)NNCC♀×(C)CC♂, with cold-treatment of eggs, 110 (7.4%) of 1491 eggs became normally feeding tadpoles. Of 77 analyzed tadpoles, 63 (81.8%) were allopentaploids, (N)NNCCC, 59 completed metamorphosis and 37 attained sexual maturity. There were 11 females and 26 males. The testes of 11 male allopentaploids including six (N)NNNCC and five (N)NNCCC had no normal spermatozoa. On the other hand, two of the seven female allopentaploids, (N)NNNCC, and nine of the 11 female allopentaploids, (N)NNCCC, contained many mature eggs. When these females were injected with bullfrog pituitaries, only two female allopentaploids, (N)NNCCC, laid 191 and 180 eggs, respectively. When inseminated with sperm of a male diploid R. nigromaculata, 122 (63.9%) and 55 (30.6%) eggs cleaved normally, respectively, and 12 (6.3%) and nine (5.0%) attained metamorphosis. The chromosomes of the offspring which were abnormal embryos and tadpoles or normal feeding tadpoles were examined. In 11 experimental series, (N)NNCC♀×(N)NNCC♂, with cold-treatment of eggs, 240 (4.3%) of 5603 eggs became normally feeding tadpoles. Of 137 analyzed tadpoles, 53 (38.7%) were allohexaploids, (N)NNNCCC; 41 of them completed metamorphosis and 22 attained sexual maturity. There were five females and 17 males. The testes of eight males examined contained no normal spermatozoa. The ovaries of four females were degenerated and contained no mature ova, while the other female had several large ova in the ovaries.

• 広島大学の論文

著者

• Nishioka M

  Institute For Amphibian Biology Graduate School Of Science Hiroshima University

• Nishioka Midori

  Laboratory For Amphibian Biology Faculty Of Science Hiroshima University

• Nishioka Midori

  Institute For Amphibian Biology Graduate School Of Science Hiroshima University

• Nishioka Midori

  Graduate School Of Science Hiroshima University

• Nishioka Midori

  Laboratory For Amphibian Biology Graduate School Of Science Hiroshima University

• KAWAMURA Toshijiro

  Laboratory for Amphibian Biology, Faculty of Science, Hiroshima University

• OKUMOTO Hitoshi

  Laboratory for Amphibian Biology, Faculty of Science, Hiroshima University

• Okumoto H

  Hiroshima Univ. Higashihiroshima Jpn

• Okumoto Hitoshi

  Laboratory For Amphibian Biology Faculty Of Science Hiroshima University

• Kawamura T

  Laboratory For Amphibian Biology Faculty Of Science Hiroshima University

• Kawamura Toshijiro

  Laboratory For Amphibian Biology Faculty Of Science Hiroshima University

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