apospory

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apospory

a situation occurring in some plants where MEIOSIS is omitted and an ordinary diploid SPOROPHYTE cell gives rise to the spore which produces a diploid GAMETOPHYTE.
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Thus, embryo sac formation generally occurs precociously in aposporic, diplosporic (see Table 2), tetrasporic, and bisporic species, as if both developmental programs (the meiotic program and the embryo sac forming program) were superimposed.
At the family level, phylogenetic associations among aposporic, diplosporic, bisporic, and tetrasporic species were found to be highly significant (Carman, 1997).
Aposporic initials developing from the nucellar tissue and in competition with sexual cells were never detected.