What products does photosystem II produce?
Photosystem II obtains replacement electrons from water molecules, resulting in their split into hydrogen ions (H+) and oxygen atoms. The oxygen atoms combine to form molecular oxygen (O2), which is released into the atmosphere.
What is produced as a result of photosystem II?
Photosystem II is the first membrane protein complex in oxygenic photosynthetic organisms in nature. It produces atmospheric oxygen to catalyze the photo-oxidation of water by using light energy. It oxidizes two molecules of water into one molecule of molecular oxygen.
What happens Photoinhibition?
Photoinhibition occurs when the rate of PS II inactivation and photodamage exceeds the rate of PS II repair (Ohad et al., 1984), and it is enhanced in excess light and during other abiotic stresses such as salinity stress (Neale and Melis, 1989).
What is produced in photosystem II electron transport?
When light is absorbed by one of the pigments in photosystem II, energy is passed inward from pigment to pigment until it reaches the reaction center. There, energy is transferred to P680, boosting an electron to a high energy level (forming P680*).
What is a main function of photosystem II?
The most important function of photosystem II (PSII) is its action as a water-plastoquinone oxido-reductase. At the expense of light energy, water is split, and oxygen and plastoquinol are formed.
Does photosystem 2 produce ATP?
This is accomplished by the use of two different photosystems in the light reactions of photosynthesis, one to generate ATP and the other to generate NADPH. Electrons are transferred sequentially between the two photosystems, with photosystem I acting to generate NADPH and photosystem II acting to generate ATP.
What is the xanthophyll cycle?
The xanthophyll cycle consists of the light-dependent conversion of the light harvesting xanthophyll, violaxanthin, to the energy quenching xanthophylls, antheraxanthin and zeaxanthin (Yamamoto and Bassi, 1999).
What is Photoinhibition in phytoplankton?
Photoinhibition is the phenomenon of a decrease in photosynthesis exhibited by plants when they are exposed to high irradiance. In the first case, photoinhibition occurs during the hours of strongest irradiance in phytoplankton growing at or near the surface.
What is the function of photosystem II?
Photosystem II (PSII) is a multi-component pigment-protein complex that is responsible for water splitting, oxygen evolution, and plastoquinone reduction.