Efficiency of the induction of cytomixis in the microsporogenesis of dicotyledonous (N. tabacum L.) and monocotyledonous (H. distichum L.) plants by thermal stress

Cytoskeleton and nucleoskeleton involvement in processes of cytomixis in plants

“…In monocots cytomixis has several forms including pair‐looped and micronuclear types (e.g., donor‐recipient and chained) (Figure ) as well as direct internuclear bridges (Mursalimov et al, ; Kravets et al, ; Sidorchuk et al, ). These variations of the behaviour can occur within a single population of microsporocytes and can happen sequentially or simultaneously, with pair‐looped and donor‐recipient interactions more typical of spontaneous cytomixis (Kravets et al, ), whereas chained interactions tend to be induced (Sidorchuk et al, ). Structurally, cytomixis is a part of the early‐prophase meiotic chromosome transformations, whereas functionally, we suppose, of DNA monitoring, homologous recombination and DNA repair (unpublished data).…”

“…Nuclear transition through the CC leads to its deformation which compresses the chromatin. Micronuclei and migrating chromatin retain the compacted structure and pyknotic form for some time post‐transition before their structure is fully restored (Pan et al, ; Mursalimov et al, , ; Mursalimov and Deineko, ; Sidorchuk et al, ). A transient changes in nuclear morphology is also seen during nuclear migration in animals, which reflects the direction of the external stimulus, the geometry of the tissue and the intracellular resistance (Friedl et al, ).…”

“…The authors of these data emphasized that this was evidence for a contributing role of this activity in driving evolution, rather than as a destructive force. Indeed, despite a significant percentage of cytological abnormalities cytomixis does display some order and regularity (Malallah and Attia, ; Bellucci et al, ; Tyagi, , Kumar and Singhal, , ; Mursalimov et al, ; Kravets, , ; Sidorchuk et al, ).…”