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 (ăp′ə-spôr′ē, ə-pŏs′pə-rē)
The development of a gametophyte directly from a sporophyte without the occurrence of meiosis or spore formation.

a·pos′por·ous (ə-pŏs′pər-əs), ap′o·spor′ic (-spôr′ĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(ˌæpəˈspɔːrəs) or


characterized by apospory
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
2010), for example, to test the ploidy status of aposporous gametophytes of Platycerum bifurcatum (Cav.) C.
Otherwise, the 2n gamete of an additional aposporous sac can be fertilized by a male haploid gamete from a neighbouring apomictic 4x plant (2n) to establish a new apomictic 4x genotype, as was achieved experimentally in P.
Frio is an aposporous apomict, and its mode of reproduction was determined by (i) cytologically observing megasporogenesis and embryo sac development and (ii) progeny testing.
Diplosporous and aposporous apomixis in a pentaploid race of Paspalum minus.
The remaining ovules had immature or aborted embryo sacs, but aposporous sacs were not observed.
In the aposporous form of apomixis, the female gametophyte (embryo sac) develops from an unreduced somatic nucellar cell in the ovule.
The utility of RAPD markers was explored in Kentucky bluegrass in determining the genetic origins of aberrant plants derived from facultative aposporous apomixis using the improved procedure with silver-stained polyacrylamide gels (Huff and Bara, 1993).
In the genus Paspalum, the absence of antipodal cells usually indicates aposporous sacs.
Quantitative analysis of aposporous parthenogenesis in Poa pratensis genotypes.
In contrast with MMCs from diplosporous and tetrasporic species, MMCs from aposporous Kentucky bluegrass (Naumova et al., 1993) and Guineagrass (Panicum maximum Jacq., Naumova and Willemse, 1995) are enveloped with callose.
Production of apomictic seed by buffelgrass is based on formation of meiotically unreduced, aposporous embryo sacs of the Panicum type followed by pseudogamous, parthenogenetic development of the embryo (Fisher et al., 1954; Nogler et al., 1984).