Production of diploid and triploid offspring by inbreeding of the triploid planarian Dugesia ryukyuensis

Kazuya Kobayashi, Hirotsugu Ishizu, Sachiko Arioka, Jocelyn Padilla Cabrera, Motonori Hoshi, Midori Matsumoto

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6 Citations (Scopus)

Abstract

Triploidy has generally been considered to be an evolutionary dead end due to problems of chromosomal pairing and segregation during meiosis. Thus, the formation of tetraploids and diploids from triploid types is a rare phenomenon. In the present study, we demonstrated that inbreeding of the triploid planarian Dugesia ryukyuensis resulted in both diploid and triploid offspring in nature. In the triploids of D. ryukyuensis, chiasmata between homologous chromosomes were observed in both female and male germ lines. This result suggests that both diploid and triploid offspring of this species are produced bisexually by zygotic fusion between sperm and eggs. Hence, this phenomenon may be a novel mechanism in planarian for escaping the triploid state.

Original languageEnglish
Pages (from-to)289-296
Number of pages8
JournalChromosoma
Volume117
Issue number3
DOIs
Publication statusPublished - 2008 Jun 1

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ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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