Colorless plastids located in roots and non photosynthetic tissue of plants . They may become specialized for bulk storage of starch, lipid or protein and are then known as amyloplasts elaioplasts, proteinoplasts.

Colourless plastids are called Leucoplasts.

Leucoplasts are a type of plastid that lack pigmentation and are therefore colorless. They are primarily involved in the synthesis and storage of various compounds. Leucoplasts are found in plant cells and are classified into different types based on their functions and contents.

Types of Leucoplasts:

1. Amyloplasts: Amyloplasts are leucoplasts that store starch. They are commonly found in storage organs such as tubers, roots, and seeds. Amyloplasts are responsible for converting excess glucose into starch and storing it for future use. They contain enzymes necessary for the synthesis and degradation of starch.

2. Proteinoplasts: Proteinoplasts are leucoplasts involved in the synthesis and storage of proteins. They are found in cells that require a high protein content, such as developing seeds, endosperm, and embryos. Proteinoplasts contain specialized enzymes for protein synthesis.

3. Elaioplasts: Elaioplasts are leucoplasts that store lipids and oils. They are found in oil-rich tissues of plants, such as seeds and fruits. Elaioplasts synthesize and store lipids, which are essential for energy storage and membrane formation.

4. Tannosomes: Tannosomes are leucoplasts involved in the synthesis and storage of tannins. Tannins are a type of phenolic compound that provide defense against herbivores and pathogens. Tannosomes are found in cells of plant tissues, such as bark and leaves, where tannins are produced.

Functions of Leucoplasts:

- Storage: Leucoplasts store various compounds such as starch, proteins, lipids, and tannins, which are essential for plant growth, development, and survival.

- Synthesis: Leucoplasts are involved in the synthesis of different molecules, including starch, proteins, lipids, and tannins. They contain specialized enzymes for these synthesis processes.

- Conversion: Leucoplasts can convert one type of compound into another. For example, amyloplasts can convert excess glucose into starch for storage.

- Differentiation: Leucoplasts can differentiate into other types of plastids, such as chromoplasts or chloroplasts, depending on the requirements of the plant cell.

In conclusion, leucoplasts are colorless plastids that play essential roles in the storage and synthesis of various compounds in plant cells. They are classified into different types based on their functions and contents, including amyloplasts, proteinoplasts, elaioplasts, and tannosomes.