THE ULTRASTRUCTURAL PATTERNS OF GERMINAL AND YOLK GRANULES IN OOCYTES
AND EMBRYONIC CELLS OF THE HOLOTHURIAN APOSTICHOPUS JAPONICUS
A. A. Reunov, Ya. N. Alexandrova
Institute of Marine Biology, Far East Branch, RAS, Vladivostok;
e-mail: arkadiy_reunov@hotmail.com
The yolk germinal granules in oocytes and embryonic cells of Apostichopus japonicus were studied by transmission
electron microscopy. Analysis of the features of synthesis and utilization of yolk granules made it possible
to reveal ultrastructural criteria to distinguish between granules of the forming and utilized yolk, and germinal
granules. Based on these findings, the authors suppose that identification of germ plasm elements in oocytes
and embryonic cells of A. japonicus is quite possible with ultrastructural analysis only, and does not require
utilizing molecular markers.
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