Sexual reproduction inEudorina elegans (chlorophyta,volvocales) |
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Authors: | Hisayoshi Nozaki |
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Institution: | (1) Keio Senior High School, Hiyoshi, Kohoku-ku, Yokohama-shi, 223 Kanagawa |
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Abstract: | Sexual reproduction inEudorina elegans Ehr. was studied in detail in laboratory cultures, with particular regard to conjugation between gametes and gone colony
formation.
Male and female gametes fused after being induced by changing the medium. The anterior end, including the flagellar base,
of the male gamete entered the anterior region of the female gamete. Fusion of the two protoplasts proceeded laterally and
posteriorly. The male gamete bore a slender cytoplasmic protrusion at the base of the flagella. This structure has not been
previously described in the male gamete ofEudorina, and may participate in plasmogamy.
A biflagellate gone cell swam from the germinating zygote and secreted a gelatinous envelope. It then divided to form a gone
colony within the gelatious envelope, which moved during colony formation by means of the two flagella which were retained
intact from the original gone cell. |
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Keywords: | Anisogamous conjugation Chlorophyta Eudorina elegans Gone colony formation Sexual reproduction Volvocales |
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