Accessory phragmoplast corrects abnormal cytokinesis in wheat x rye hybrids |
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Authors: | N. V. Shamina L. F. Dudka V. Ya. Kovtunenko E. U. Bolobolova |
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Affiliation: | (1) Institute of Cytology and Genetics, Novosibirsk, Russia;(2) Luk’yanenko Agricutural Institute, Krasnodar, Russia |
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Abstract: | The compensation for phragmoplast dysfunction in the male meiosis of F1 wheat × rye hybrids was described. In pollen mother cells (PMCs), he transition from central spindle fibers (forming a solid bundle) to phragmoplast (hollow cylinder) was blocked. This blockage suppresses the centrifugal movement of the phragmoplast and cell-plate formation. As a result, cells become binucleate. Sometimes, two nuclei fuse and form one restitution nucleus. In PMCs of the wheat × rye F1 hybrid D-144 gp 06 year (T. aestivum n. 93-60 t 9 × S. cereale n. Saratovskaya 7) with this phenotype, an additional phragmoplast is formed at the late telophase. This occurs by a common mechanism for the development of the immobile phragmoplast in the meiosis in bicotyledons; new phragmoplasts arise as a result of microtubule polymerization starting from the spindle poles. The accessory phragmoplast facilitates a new cell plate assembly and achievement of cytokinesis. |
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Keywords: | cell division pollen mother cells meiosis cereal wide hybrids cytokinesis cytoskeleton phragmoplast |
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