horocytes

Horocytes are a type of cell found in certain plants, notably members of the family Asteraceae, which includes sunflowers and daisies. These cells are specialized for the storage of lipids, or fats. They are typically found in the pith and cortex of stems and roots, and sometimes in leaves. Horocytes are characterized by their large, spherical or oval shape and their cytoplasm, which is densely packed with lipid droplets. These droplets often appear as clear or unstained spaces within the cell when viewed under a microscope because the lipids are dissolved during the preparation process.

The primary function of horocytes is to accumulate and store reserve lipids. These stored lipids can serve as an energy source for the plant during periods of stress, such as darkness or nutrient deficiency, or during reproductive growth. They can also be mobilized to support seedling establishment after germination. The presence and abundance of horocytes can vary depending on the plant species, its developmental stage, and environmental conditions. While the term "horocyte" specifically refers to lipid-storing cells in some plant groups, the general phenomenon of lipid storage within plant tissues is widespread and can occur in various cell types. Understanding horocytes contributes to our knowledge of plant metabolism and energy storage strategies.