The Behavior of Chromosomes During Parthenogenetic Oogenesis in Marmorkrebs Procambarus fallax f. virginalis

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  • Miku Kato
    Department of Natural History Sciences, Faculty of Science, Hokkaido University,Kita 10 Nishi 8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan
  • Chizue Hiruta
    Department of Biology, Center for Liberal Arts and Sciences, Iwate Medical University,Nishitokuta 2-1-1, Yahaba-cho, Shiwa-gun, Iwate 028-3694, Japan
  • Shin Tochinai
    Field Science Center for Northern Biosphere, Hokkaido University,Kita 11 Nishi 8, Kita-ku, Sapporo, Hokkaido 060-0811, Japan

説明

Parthenogenetic oogenesis varies among and even within species. Based on cytological mechanisms, it can largely be divided into apomixis (ameiotic parthenogenesis) producing genetically identical progeny, and automixis (meiotic parthenogenesis) producing genetically non-identical progeny. Polyploidy is common in parthenogenetic species, although the association between parthenogenesis and polyploidy throughout evolution is poorly understood. Marmorkrebs, or the marbled crayfish, was first identified as a parthenogenetic decapod and was tentatively named as Procambarus fallax f. virginalis. Previous studies revealed that Marmorkrebs is triploid and produces genetically identical offspring, suggesting that apomixis occurs during parthenogenetic oogenesis. However, the behavior of chromosomes during the process of oogenesis is still not well characterized. In this study, we observed parthenogenetic oogenesis around the time of ovulation in P. fallax f. virginalis by histology and immunohistochemistry. During oogenesis, the chromosomes were separated into two groups and behaved independently from each other, and one complete division corresponding to mitosis (the second meiosis-like division) was observed. This suggests that parthenogenetic oogenesis in Marmorkrebs exhibits gonomery, a phenomenon commonly found in apomictic parthenogenesis in polyploid animals.

収録刊行物

  • Zoological Science

    Zoological Science 33 (4), 426-, 2016-08-01

    Zoological Society of Japan

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