ovular$56959$ - traduction vers néerlandais
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ovular$56959$ - traduction vers néerlandais

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

ovular      
adj. eier-, van ei

Définition

Nucellus
·noun ·see Nucleus, 3 (a).

Wikipédia

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.