Polar nucleus | plant anatomy | Britannica (original) (raw)

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angiosperm gametophytes

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  In plant reproductive system: Angiosperms
  …with the two nuclei (polar nuclei) within the large central cell of the female gametophyte. The resultant nucleus, which has three sets of chromosomes, is the primary endosperm nucleus. This process, double fertilization, occurs only in angiosperms.
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seed structure

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  In seed: Angiosperm seeds
  …centre are referred to as polar nuclei; the egg cell, or oosphere, is situated near the micropylar (“open”) end of the ovule.
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