nuclear endosperm

plant anatomy

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June 11, 2026

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The term "nuclear endosperm" refers to a specific type of endosperm formation in flowering plants. Endosperm is a nutritive tissue that surrounds and nourishes the embryo within a seed.12

This process begins with double fertilization, unique to angiosperms. During double fertilization, one sperm nucleus fuses with the egg cell to form the zygote (which develops into the embryo), and a second sperm nucleus fuses with two polar nuclei in the embryo sac. This fusion creates a triploid nucleus, known as the endosperm nucleus. This endosperm nucleus then undergoes repeated free-nuclear divisions before cell walls are formed, leading to the development of nuclear endosperm. This tissue serves as a vital food source for the developing embryo and the germinating seed.1342

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angiosperm
Fertilization and embryogenesis
In nuclear endosperm formation, repeated free-nuclear divisions take place; if a cell wall is formed, it will form after free-nuclear division. In cellular endosperm formation, cell-wall formation is coincident with nuclear divisions. In helobial endosperm formation, a cell wall is laid down between the first two…
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In nuclear endosperm formation, repeated free-nuclear divisions take place; if a cell wall is formed, it will form after free-nuclear division. In cellular endosperm formation, cell-wall formation is coincident with nuclear divisions. In helobial endosperm formation, a cell wall is laid down between the first two…
Read More