Distribution of accessory nuclei in the oocytes of the sawfly, Athalia rosae (Hymenoptera: Tenthredinidae)
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In the oocytes of Athalia rosae accessory nuclei (AN) arise in late previtellogenesis. Three categories of AN: large (LAN), medium (MAN), and small (SAN) can be distinguished. Distribution of AN along the anteroposterior and dorsoventral axes of the oocyte is uneven. In the previtellogenic and vitellogenic oocytes dorsoventral polarity is marked by an abundance of AN in the ventral ooplasm. Distribution of AN along anteroposterior axis depends on the stage of oogenesis. In this paper the possible mechanism responsible for the uneven distribution of AN is proposed and discussed.
Publication order reference
M. Zawadzka, Department of Systematic Zoology, Institute of Zoology, Jagiellonian University, R. Ingardena 6, 30-060 Krakow, Poland.