Leucoplast

Leucoplasts ("formed, molded") are a category of plastid and as such are organelles found in plant cells.

Lacking photosynthetic pigments, leucoplasts are located in non-photosynthetic tissues of plants, such as roots, bulbs and seeds.

They may be specialized for bulk storage of starch, lipid or protein and are then known as amyloplasts, elaioplasts, or proteinoplasts (also called aleuroplasts) respectively.

In general, leucoplasts are much smaller than chloroplasts and have a variable morphology, often described as amoeboid.

After several minutes exposure to light, etioplasts transform into functioning chloroplasts and cease being leucoplasts.