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...

primitive arthropods
Arthropods

The arthropods were assumed to be the first taxon of species to possess jointed limbs and exoskeleton, exhibit more adva..

Psychiatry and mental disorders
Psychiatry & Mental Disorders

Different mental disorders are described here. Read this tutorial to get an overview of schizophrenia, affective mood di..

Physiological Homeostasis
Physiological Homeostasis

Homeostasis is essential to maintain conditions within the tolerable limits. Otherwise, the body will fail to function p..

Cell Respiration
Cell Respiration

Cell respiration is the process of creating ATP. It is "respiration" because it utilizes oxygen. Know the different stag..

Homo Species
The Homo Species

The evolution of the species of the genus "Homo" led to the emergence of modern humans. Find out more about human evolut..

river
Running Water Freshwater Communities

This tutorial introduces flowing water communities, which bring new and dithering factors into the equation for possible..