单词	apomixis
释义	apomixis /ˌapəˈmɪksɪs / noun [mass noun] Botany Asexual reproduction in plants, in particular agamospermy. Often contrasted with amphimixis.Another example is the major impact that understanding apomixis would have on plant breeding.... During in vivo development, maternal apomixis refers to the asexual formation of a seed from the maternal tissues of the ovule, avoiding the processes of meiosis and fertilization. It is noteworthy that according to the studies of Illg, M. brasiliensis may be apomictic, although pollinator-dependent; i.e. apomixis is triggered by pollen-tube development. Derivatives apomictic adjective ... Maternal apomictic embryos develop from a somatic cell within the ovule or from an unreduced embryo sac derived from the megaspore mother cell (diplospory). The results show that early fertilization leads to the formation of apomictic embryos while fertilization at anthesis favours the formation of sexually derived embryos. Furthermore, apomictic reproduction has been found in most polyploid Corollinae species, which, if transferred to cultivated beet, has the potential to improve the fixation of desired genotypes in breeding programmes. Origin Early 20th century: from apo- + Greek mixis 'mingling'.
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