Function of Nucellus

The nucellus is a central cell in the ovule of a flowering plant. It performs various essential functions during the process of fertilization and seed development. Let's discuss the functions of the nucellus in detail.

1. Nutrient Storage
The nucellus stores nutrients to nourish the developing embryo. It contains starch grains, proteins, and oils that are essential for the growth of the embryo. The nutrients stored in the nucellus are transferred to the developing embryo through the endosperm.

2. Secretion of the Embryo Sac
The nucellus secretes the embryo sac, which encloses the embryo. The embryo sac is a protective layer that prevents the embryo from being damaged during development.

3. Secretion of Enzymes
The nucellus secretes enzymes that help in the breakdown of the endosperm. The endosperm provides nutrients to the developing embryo, and the enzymes secreted by the nucellus help in the breakdown of the endosperm, making the nutrients available to the embryo.

4. Formation of the Micropyle
The nucellus forms the micropyle, which is a small opening in the ovule. The micropyle allows the pollen tube to enter the ovule, facilitating fertilization.

5. Production of Antifungal Compounds
The nucellus produces antifungal compounds that protect the developing embryo from fungal infections.

In conclusion, the nucellus plays a vital role in the development of the ovule and the growth of the embryo. It stores nutrients, secretes the embryo sac, enzymes, and antifungal compounds, and forms the micropyle, which facilitates fertilization.