Erratum to Production of diploid and triploid offspring by inbreeding of the triploid planarian <Emphasis Type="Italic">Dugesia ryukyuensis</Emphasis> |
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| Authors: | Kazuya Kobayashi Hirotsugu Ishizu Sachiko Arioka Jocelyn Padilla Cabrera Motonori Hoshi Midori Matsumoto |
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| Institution: | (1) Department of Biosciences and Informatics, Keio University, Hiyoshi 3-14-1, Kouhoku-ku, Yokohama 223-8522, Japan;(2) Center for Life Science and Technology, Keio University, Hiyoshi 3-14-1, Kouhoku-ku, Yokohama 223-8522, Japan;(3) Institute of Biology, University of the Philippines, Diliman, Quezon City, 1101, Manila, Philippines;(4) Present address: Animal Evolutionary Ecology, Zoological Institute, University of Tübingen, Auf Der Morgenstelle 28, 72076 Tübingen, Germany;(5) Present address: University of the Air, 2-11, Wakaba, Mihama-ku, Chiba 261-8586, Japan |
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| 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. |
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