Dictionary > Amyloplast

Amyloplast

Definition
noun, plural: amyloplasts
(botany) A type of leucoplast found in the cytoplasm of a plant cell, and serves as storage organelle of amylopectin
Supplement
Plastids are organelles involved in the synthesis and storage of food. They are found within the cells of photosynthetic eukaryotes. In plants, plastids may develop into these forms: (1) chloroplasts, (2) chromoplasts, (3) gerontoplasts, and (4) leucoplasts. Leucoplasts are colourless plastids because they lack pigments. Their role is primarily for storage. Depending on the content of the leucoplasts, they may be amyloplasts, elaioplasts, proteinoplasts, or tannosomes.
Amyloplast is a leucoplast that is primarily involved in storing starch and detecting gravity. As for storing starch, the amyloplasts transform glucose into starch by polymerization of glucose and store the starch grains in the stroma. Most of the amyloplasts can be found in underground storage tissues of plants, such as potato. The amyloplasts, though, can turn into chloroplasts, such as seen in potato tubers that are exposed to light. They become green as the amyloplasts convert into chloroplasts.
As for detecting gravity, the amyloplasts are able to perceive gravity (gravitropism). These amyloplasts involved in gravitropism are referred to as statoliths.
Word origin: Gk ámylon (starch) + Gk plastós (formed, molded)
See also:


You will also like...

squirrel
Animal Water Regulation

Animals adapt to their environment in aspects of anatomy, physiology, and behavior. This tutorial will help you understa..

Plant Water Regulation
Plant Water Regulation

Plants need to regulate water in order to stay upright and structurally stable. Find out the different evolutionary adap..

Water Cycle
The Water Cycle

The water cycle (also referred to as the hydrological cycle) is a system of continuous transfer of water from the air, s..

Adaptation Tutorial
Adaptation Tutorial

Adaptation, in biology and ecology, refers to the process or trait through which organisms or the populations in a habit..

Plant biology
Plant Biology

Plantlife can be studied at a variety of levels, from the molecular, genetic and biochemical level through organelles, c..

Early Earth
The Origins of Life

This tutorial digs into the past to investigate the origins of life. The section is split into geological periods in the..

Related Articles...

No related articles found

See all Related Topics