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How do endosperm and cotyledons provide food to a developing seedling?
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plant development
The life cycle of the fern. (1) Clusters (sori) of sporangia (spore cases) grow on the undersurface of mature fern leaves. (2) Released from its spore case, the haploid spore is carried to the ground, where it germinates into a tiny, usually heart-shaped, gametophyte (gamete-producing structure), anchored to the ground by rhizoids (rootlike projections). (3) Under moist conditions, mature sperm are released from the antheridia and swim to the egg-producing archegonia that have formed on the gametophyte's lower surface. (4) When fertilization occurs, a zygote forms and develops into an embryo within the archegonium. (5) The embryo eventually grows larger than the gametophyte and becomes a sporophyte.
During the early stages of plant development, a seedling relies on nutritional reserves provided by the parent plant until it becomes self-supporting through photosynthesis. These reserves are stored either within the endosperm or the cotyledons.1
The Role of Endosperm and Cotyledons
- Endosperm: This tissue acts as a primary food store in many angiosperms. It contains essential nutrients such as carbohydrates, lipids, and proteins.3
- Cotyledons: These embryonic seed leaves function as the interface for nutrition. In seeds where reserves are stored in the endosperm, the cotyledons act as specialized absorbing organs that mobilize and transfer these nutrients to the developing radicle and epicotyl. In other species, the cotyledons themselves store the nutritional reserves, which are then transferred directly to the seedling during germination.12
Much of the early metabolic activity in a seedling involves mobilizing these stored, often insoluble, materials into forms that can be translocated to active growth areas. Once these reserves are exhausted, the seedling must be established as a photosynthetic organism to survive.1