embryo sac


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Related to embryo sac: pollen grain, double fertilization, synergid

embryo sac

n.
The female gametophyte of a seed plant, within which the embryo develops.

embryo sac

n
(Botany) the structure within a plant ovule that contains the egg cell: develops from the megaspore and contains the embryo plant and endosperm after fertilization

em′bryo sac`


n.
(in flowering plants) a large cell of the rudimentary seed, within which the embryo develops. Also called megaspore.

embryo sac

An oval structure within an ovule of a flowering plant that contains the egg cell. Together with the fertilized egg cell, it develops into a seed.
Translations

embryo sac

[ˈɛmbrɪəʊˈsæk] nsacco embrionale
References in periodicals archive ?
Their topics include mitochondrial and peroxisomal divisions, mechanisms of organelle inheritance in dividing plant cells, the regulation of plant cell expansion: auxin-induced turgor-driven cell elongation, asymmetric cell division in the zygote of flowering plants: the continuing polarized event of embryo sac development, and death and rebirth: programmed cell death during plant sexual reproduction.
The functional megaspore undergoes three successive mitoses resulting in the formation of an 8- nucleate embryo sac of the Polygonum type.
There seems to be no doubt that the endothelium is a nutritive layer, whose main role is to work as an intermediate for the transport of nutrients from the integument to the embryo sac (MAHESHWARI, 1971).
After the embryo sac in fertilized by the pollen tube, the ovule gradually turns into a seed, and the carpel becomes a fruit.
Because it was difficult to discriminate morphological features of pollen tubes on stigmas between "Q10-33-1" and "QX-118," a possible reason for this discrepancy is that the growth of "QX-118" pollen tubes was abnormal or inhibited, and few pollen tubes could grow toward the embryo sac along the transmitting tissues of style, and as a consequence the ovules were not fertilized.
So, the present investigation has been conducted to determine the chromosome number of a series of Brazilian accessions of Caespitosa, and to analyze the type of embryo sac in representatives of three species.
The female gametophyte corresponds to the embryo sac and covers an egg cell, a central cell, two synergid cells, and several antipodal cells.
Through this route, immature ovules are cultured up to maturation of embryo sac, where a haploid embryo is developed.
Embryo sac development and fruit set of 'Satohnishiki' sweet cherry as affected by temperature, GA3 and paclobutrazol.
Earlier, the research team used genetic tools to shift the position of a single nucleus at one end of an embryo sac in the plant Arabidopsis.
Previous research suggested synergid cells, which hug the embryo sac, direct the tubes once they approach the ovary.