Apomicts reproduce clonally through seeds, including apomeiosis
, parthenogenesis, and autonomous or pseudogamous endosperm formation.
Estos datos nos permiten considerar que esta generacion tiene una supervivencia mas larga con respecto a la gametofitica, y a otros mecanismos de reproduccion como la propagacion vegetativa o la apomeiosis
(Ardito y Gomez, 2005).
The objective of the present study was to determine if the meiotic anomalies typical of apomeiosis and 2n pollen formation in E.
Nevertheless, other attributes of apomeiosis were observed in clones of all four [B.sub.III] hybrids, including weak callose fluorescence (Fig.
The present study provides evidence that certain aspects of apomeiosis in E.
Accordingly, developmental signals that initiate and maintain meiosis, embryo sac formation, and embryogenesis must be appropriately superimposed or apomeiosis followed by precocious embryo sac formation and parthenogenesis will not occur.
During apomeiosis, most MMCs become abnormally elongated and enter a lengthy "waiting" stage in which vacuoles form and coalesce.
During meiosis or apomeiosis
, in polysporic or diplosporic species, respectively, other embryo-sac-specific genes may be differentially expressed, which either limit (bispory and Taraxacum and Ixeris types of diplospory) or prevent (tetraspory and Antennaria type diplospory) cytokinesis.
The formation of unreduced eggs through apomeiosis in a diploid plant of M.
Stability of expression of apomeiosis was established by comparing the frequency of apomeiosis in field grown plants of PG-F9 in 1992 and 1993.
The occurrence of normal tetrads and the degree of apomeiosis were significantly different ([chi square] = 38.464, P [is less than or equal to] 0.001, d.f.
Thus, stable versus variable expression of restitutional meiosis and diplosporic apomeiosis may reflect a female gametophyte development influenced by various modifying genes whose expression is sensitive to the environment.