megagametophyte


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megagametophyte

[¦meg·ə·gə′mēd·ə‚fīt]
(botany)
The female gametophyte in plants having two types of spores.
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References in periodicals archive ?
In vitro morphogenesis of Ceratozamia hildae and C mexicana from megagametophytes and zygotic embryos.
In an effort to identify possible causes for low rates of seed initiation in greenhouse-grown buckwheat, megagametophyte structure was surveyed across the time course of maximum reproductive activity (Weeks 5 through 9).
Fine structural development of the megagametophyte of Zea mays following fertilization.
megagametophyte: Gametophyte stage containing eight haploid nuclei within the embryo sac.
Dissected ovules were examined for comparative development of megagametophytes derived from vc or control genotypes with a Leitz Diaplan (Leitz/Wild, Rockleigh, NJ) microscope with Normarski interference.
However, genetic interpretation of isozyme variants is more difficult with diploid, vegetative tissue than with haploid megagametophytes from the seeds, and mating system analysis is not possible with vegetative tissues.
At the micropylar end of the seed, the megagametophyte (sometimes erroneously called endosperm) is covered by the brown, papery left over of the nucellus (perisperm) and forms a cap over the archegonial chamber and radicle (Fig.
The pollination, by a donor raised in one environment, of homozygous, identical maternal plants raised in an array of environments will allow the detection of environmentally induced maternal effects (cases 3 and 4, above) ruling out the possibility of environment-specific meiotic drive among megagametophytes. If genetically identical homozygous pollen donors, raised in distinct environments, are compared with respect to their pollen performance or the mean phenotype of their offspring, one may detect environmentally induced paternal effects (cases 3 and 4, above).
megagametophyte are apparently primitive, for both are multigametic (up
At time of fertilization, the megagametophyte consists of antipodal cells at the placental side and two partly fused polar nuclei and egg apparatus at the micropylar end.
Megagametophyte organization in diploid alfalfa meiotic mutants producing 4n pollen and 2n eggs.