Dictionary > Accessory pigment

Accessory pigment

Definition
noun, plural: accessory pigments
A non-chlorophyll pigment inside the chloroplast of photosynthetic organisms, and help in absorbing other light energy essential during the light reactions of photosynthesis
Supplement
In photosynthetic organisms such as algae and plants, they have light-absorbing pigments essential in the process of photosynthesis. Photosynthesis is a process that produces complex organic material from inorganic sources and light energy. The process is comprised of two main reactions: the light reactions and the dark reactions. The light reactions of photosynthesis occur on the thylakoid membranes of the chloroplast. The light reactions may either be cyclic or non-cyclic. In cyclic reaction, when the electron is displaced from the photosystem, the electron is passed down the electron acceptor molecules and returns back to photosystem I, from where it was emitted. In the non-cyclic reaction, the photons are captured in the light-harvesting antenna complexes of photosystem II by chlorophyll and other accessory pigments. Accessory pigments are therefore essential since they help absorb light and then pass the energy to a primary pigment, i.e. chlorophyll. Examples of accessory pigments are carotenoids (e.g. xanthophylls and carotenes) and phycobilins (e.g. phycoerythrin, phycocyanin, allophycocyanin, etc.).
See also:


You will also like...

temperature - abiotic factor
Abiotic and Biotic Factors

This tutorial deals with the abiotic factors of the freshwater environment that determine what sort of life would be sui..

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..

New Zealand - Biodiversity fauna
New Zealand’s Biodiversity

Find out more about New Zealand's unique biodiversity by exploring a range of different ecosystems and the key role of s..

Photosynthesis and respiration
Plant Metabolism

Plants are responsible for incredible feats of molecular transformation. Plant processes, such as photosynthesis, photop..

Origins of Life on Earth
Origins of Life on Earth

Earth was created around 4.5 billion years ago and life began not long after. Primitive life likely possessed the elemen..

green plant cells
Plant Cells vs. Animal Cells

Plant cells have plastids essential in photosynthesis. They also have an additional layer called cell wall on their cell..

Related Articles...

No related articles found

See all Related Topics