caa a22 4500 445840501 CHVBK 20180317145342.0 cr unu---uuuuu 170323e20111001xx s 000 0 eng 10.1007/s00709-010-0234-5 doi (NATIONALLICENCE)springer-10.1007/s00709-010-0234-5 An ultrastructural study of cytomixis in tobacco pollen mother cells [Elektronische Daten] [Sergey Mursalimov, Elena Deineko] Intercellular chromatin migration (cytomixis) in the pollen mother cells of two tobacco (Nicotiana tabacum L.) lines was analyzed by electron microscopy during the first meiotic prophase. The maximal manifestation of cytomixis was observed in the pachytene. As a rule, several cells connected with one another by cytomictic channels wherein the nuclei migrated were observable at this stage. In the majority of cases, nuclei passed from cell to cell concurrently through several closely located cytomictic channels. Chromatin migrated between cells within the nuclear envelope, and its disintegration was unobservable. The nucleus, after passing through cytomictic channels into another cell, can be divided into individual micronuclei or, in the case of a direct contact with another nucleus, can form a nuclear bridge. It has been demonstrated that the chromatin structure after intracellular migration visually matches the chromatin structure before it passed through the cytomictic channel. No signs of pyknosis were observable in the chromatin of the micronuclei formed after cytomixis, and the synaptonemal complex was distinctly seen. The dynamics of changes in the nucleoli during cytomixis was for the first time monitored on an ultrastructural level. Possible mechanisms determining cytomixis are discussed and the significance of this process in plant development is considered. Springer-Verlag, 2011 Cytomixis nationallicence Cytomictic channels nationallicence Cell wall nationallicence Microsporogenesis nationallicence Mursalimov Sergey Laboratory of Plant Bioengineering, Institute of Cytology and Genetics, Siberian Branch, Russian Academy of Sciences, Prospekt Lavrentyeva 10, 630090, Novosibirsk, Russian Federation aut Deineko Elena Laboratory of Plant Bioengineering, Institute of Cytology and Genetics, Siberian Branch, Russian Academy of Sciences, Prospekt Lavrentyeva 10, 630090, Novosibirsk, Russian Federation aut Protoplasma Springer Vienna 248/4(2011-10-01), 717-724 0033-183X 248:4<717 2011 248 709 https://doi.org/10.1007/s00709-010-0234-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00709-010-0234-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mursalimov Sergey Laboratory of Plant Bioengineering, Institute of Cytology and Genetics, Siberian Branch, Russian Academy of Sciences, Prospekt Lavrentyeva 10, 630090, Novosibirsk, Russian Federation aut NATIONALLICENCE 700 1- Deineko Elena Laboratory of Plant Bioengineering, Institute of Cytology and Genetics, Siberian Branch, Russian Academy of Sciences, Prospekt Lavrentyeva 10, 630090, Novosibirsk, Russian Federation aut NATIONALLICENCE 773 0- Protoplasma Springer Vienna 248/4(2011-10-01), 717-724 0033-183X 248:4<717 2011 248 709 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer