polyembryony

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pol·y·em·bry·o·ny

(pol'ē-em-brē'ō-nē),
Condition of a zygote's giving rise to two or more embryos.
[poly- + G. embryon, embryo]

polyembryony

/poly·em·bry·o·ny/ (-em-bri´o-ne) the production of two or more embryos from the same oocyte or seed.

polyembryony

(pŏl′ē-ĕm′brē-ə-nē, -ĕm-brī′-)
n.
Development of more than one embryo from a single egg or ovule.

pol′y·em′bry·on′ic (-brē-ŏn′ĭk) adj.

polyembryony

  1. (in plants) the formation of more than one embryo within the TESTA of a seed.
  2. (in animals) the development of more than one embryo from a single egg as occurs, for example, in certain parasitic HYMENOPTERA which use this phenomenon to increase rapidly the numbers of juveniles within the host.

polyembryony

the production of two or more embryos from one ovum, e.g. monozygotic twins. Armadillos are the only consistently polyembryonic mammals.
It is a phenomenon in some helminths, e.g. Gyrodactylus spp., in which viviparous adults produce trematodes that are identical with themselves and as larvae they carry larvae within their uteri which contain larvae in their uteri. The rate of reproduction can be very high. Also occurs in some insects in which fertilized eggs give rise to a number of larvae.
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References in periodicals archive ?
tribuloides female produced embryos that were more than 20% polyembryonic, even under the presumably unstressful conditions of 22 [degrees]C and 32 ppt (Fig.
Brood size in a polyembryonic parasitoid wasp is affected by relatedness among competing larvae.
Copidosoma truncatellum, a polyembryonic parasite of Trichoplusia ni age of host eggs parasitized, searching, fecundity, and effectiveness.
It is highly recommended to give preference to local varieties that have small size and the polyembryonic cultivars, i.
planipennisi is not polyembryonic (JJD unpublished data), the number of parasitoid offspring (late-instar larvae/pupae) is a reasonable estimate of egg production or fecundity.
Comparison of free and glycosidically linked volatile components from polyembryonic and monoembryonic mango (Mangifera indica L.
Costs and consequences of superparasitism in the polyembryonic parasitoid Copidosoma koehleri (Hymenoptera: Encyrtidae).
In polyembryonic seeds, there is usually a zygotic embryo formed by fertilization, and one or more asexual embryos, which produce plants that are clones of the mother plant.