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Live observation of the oviposition process in Daphnia magna


Autoři: Dohyong Lee aff001;  Ji Soo Nah aff001;  Jungbin Yoon aff001;  Won Kim aff001;  Kunsoo Rhee aff001
Působiště autorů: Department of Biological Sciences, Seoul National University, Seoul, Korea aff001
Vyšlo v časopise: PLoS ONE 14(11)
Kategorie: Research Article
doi: https://doi.org/10.1371/journal.pone.0224388

Souhrn

In favorable conditions, Daphnia magna undergoes parthenogenesis to increase progeny production in a short time. However, in unfavorable conditions, Daphnia undergoes sexual reproduction instead and produces resting eggs. Here, we report live observations of the oviposition process in Daphnia magna. We observed that the cellular contents flowed irregularly through the narrow egg canal during oviposition. Amorphous ovarian eggs developed an oval shape immediately after oviposition and, eventually, a round shape. Oviposition of resting eggs occurred in a similar way. Based on the observations, we propose that, unlike Drosophila eggs, Daphnia eggs cannot maintain cytoplasmic integrity during oviposition. We also determined that the parthenogenetic eggs were activated within 20 min, as demonstrated by vitelline envelope formation. Therefore, it is plausible that the eggs of Daphnia magna may be activated by squeezing pressure during oviposition.

Klíčová slova:

Drosophila melanogaster – Light microscopy – Oocytes – Ovaries – Oviposition – Sexual reproduction – Daphnia – Parthenogenesis


Zdroje

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