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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