Question
Describe the endosperm development in angiosperms.
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Answer
- The endosperm development starts from the primary endosperm cell (PEC).
- In the most common type of endosperm development, the primary endosperm nucleus (PEN) undergoes repeated mitotic divisions to give rise to a number of free nuclei in the primary endosperm cell.
- The number of free nuclei formed varies greatly with the species.
- At this stage of development, the endosperm is called free-nuclear endosperm.
- Subsequently, cell wall formation occurs and the endosperm becomes cellular.
- The cells are filled with reserve food materials. Endosperm development precedes that of embryo development as an adaptation to provide assured nutrition to the embryo.
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