[Genesis of cells of apical meristems and realization of gametophytic apomixis in flowering plants].
Based on our own and literature data on peculiarities of caryotypical variability, we concluded that gametophytic apomixis is naturally accompanied with phenomena of poly-, aneu-, and mixoploidy and that apomicts have genome instability manifesting at the level of meristematic somatic cells. In this connection, a hypothesis is substantiated that realization of this mode of seed reproduction in flowering plants is caused by modification of systems of cell cycle control, following after acts of hybridogenesis and/or polyploidization. It is concluded that instability of the seed reproduction system by gametophytic apomixis manifests not only at the stage of choice of a seed reproduction pathway (apomeiosis-euspory; apozygosis-zygosis) but also in all the cycles of reproduction of the cells of a germ line in plant ontogenesis.
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D060832:Apomixis / Q000235:genetics*; D059447:Cell Cycle Checkpoints / Q000235:genetics; D032461:Chromosomes, Plant; D019684:Magnoliopsida / Q000166:cytology / Q000235:genetics* / Q000254:growth & development*; D018519:Meristem / Q000166:cytology / Q000235:genetics* / Q000254:growth & development; D009024:Morphogenesis; D011003:Ploidies; D012639:Seeds / Q000166:cytology / Q000235:genetics / Q000254:growth & development