nucellus - ορισμός. Τι είναι το nucellus
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Τι (ποιος) είναι nucellus - ορισμός

PLANT STRUCTURE. A SMALL BODY IN SEED-BEARING PLANTS THAT CONSISTS OF THE INTEGUMENT(S), NUCELLUS, AND EMBRYOSAC (CONTAINING THE EGG CELL) AND DEVELOPS INTO THE SEED AFTER FERTILIZATION
Nucellar; Nucellus; Embryo sac; Perisperm; Ovules; Antipodal Cells; Ovular; Antipodal cell; Synergid; Funiculus (plant reproduction); Micropyle (botany)
  • Ovule with megagametophyte: egg cell (yellow), synergids (orange), central cell with two polar nuclei (bright green), and antipodals (dark green)
  • Megagametophyte formation of the genera ''Polygonum'' and ''Lilium''. Triploid nuclei are shown as ellipses with three white dots. The first three columns show the meiosis of the megaspore, followed by 1-2 mitoses.
  • Models of different ovules, [[Botanical Museum Greifswald]]
  • Plant ovules: Gymnosperm ovule on left, angiosperm ovule (inside ovary) on right
  • Ovule structure (anatropous) 1: nucellus 2: [[chalaza]] 3: funiculus 4: raphe
  • Location of ovules inside a ''[[Helleborus foetidus]]'' flower

Nucellus         
·noun ·see Nucleus, 3 (a).
nucellus         
[nju:'s?l?s]
¦ noun (plural nucelli -l??, -li:) Botany the central part of an ovule, containing the embryo sac.
Derivatives
nucellar adjective
Origin
C19: mod. L., appar. an irregular dimin. of nucleus.
Ovule         
·noun An Ovum.
II. Ovule ·noun The rudiment of a seed. It grows from a placenta, and consists of a soft nucleus within two delicate coatings. The attached base of the ovule is the hilum, the coatings are united with the nucleus at the chalaza, and their minute orifice is the foramen.

Βικιπαίδεια

Ovule

In seed plants, the ovule is the structure that gives rise to and contains the female reproductive cells. It consists of three parts: the integument, forming its outer layer, the nucellus (or remnant of the megasporangium), and the female gametophyte (formed from a haploid megaspore) in its center. The female gametophyte — specifically termed a megagametophyte— is also called the embryo sac in angiosperms. The megagametophyte produces an egg cell for the purpose of fertilization. The ovule is a small structure present in the ovary. It is attached to the placenta by a stalk called a funicle. The funicle provides nourishment to the ovule.