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Polar nuclei


polar nuclei
In angiosperms, the two nuclei of the central cell of the female gametophyte; they fuse with a sperm nucleus to form the triploid (3n) endosperm nucleus.
pollen ...
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polar nuclei Two of the eight haploid nuclei of a megagametophyte that migrate, one from each end, to the middle of the embryo sac. These two nuclei fuse with a sperm nucleus during double fertilization.
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polar nuclei
The two nuclei that are formed at each pole of the angiosperm embryo sac. They will fuse with a male nucleus to form a primary endosperm nucleus.
Covered in Lab 8 Seed Plant Reproduction ...
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One sperm nucleus fuses with the egg forming the diploid zygote.
The other sperm nucleus fuses with the polar nuclei forming the endosperm nucleus. Most angiosperms have two polar nuclei so the endosperm is triploid (3n).
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The events of "double fertilization" of the egg and polar nuclei by the two sperm cells. Image from Purves et al.
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: The union of one male gametophyte nucleus with the ovum nucleus and another male gametophyte nucleus with the polar nuclei to form the endosperm in seed plants. See also
pollen grain
.
Double heterozygote ...
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The other sperm cell fuses with two haploid polar nuclei in the center of the embryo sac. The resulting cell is triploid (3n). This triploid cell divides through mitosis and forms the endosperm, a nutrient-rich tissue inside the fruit.
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