CORTICAL CYTOSKELETAL RING AT PROPHASE II LEADS TO CORRECTION OF ABNORMALITIES OF THE FIRST MEIOTIC DIVISION
AND TO MEIOTIC RESTITUTION
N. V. Shamina,1 I. A. Zaporozhchenko,2 Yu. R. Maksiutova,2
O. A. Shatskaya 3
1 Institute of Cytology and Genetics, Siberian Branch of RAS, Novosibirsk, 2 Chair of
Cytology and Genetics of Novosibirsk State University, and 3 Kuban P. P. Lukianenko Research Agricultural
Institute, Krasnodar;
The deviation of prophase cytoskeletal ring formation was determined during meiotic division in 50 % of
pollen mother cells (PMCs) in maize haploid N 1498 (Zea mays). At prophase in both meiotic divisions the cytoskeletal
ring is formed in cortical region of cytoplasm instead of perinuclear. Sometimes formation of both perinuclear
and cortical rings is observed in the same cell. It has been shown that in multinucleate PMCs the cortical
ring leads to the consolidation of chromosomes into common spindle and to meiotic restitution.
Key words: cytoskeleton division spindle, PMCs, Zea mays, haploids, meiosis, microtubules
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