What is photorespiration and what is its effect?
Photorespiration is the oxygenation of RuBP by RUBISCO followed by photorespiratory glycolate metabolism. Evidence that photorespiration influences net photosynthesis and is linked to photoinhibition stems from the effect of oxygen concentration on the rate of 14C assimilation. …
What does RUBISCO mean?
Ribulose-1,5-bisphosphate carboxylase-oxygenase, commonly known by the abbreviations RuBisCo, rubisco, RuBPCase, or RuBPco, is an enzyme involved in the first major step of carbon fixation, a process by which atmospheric carbon dioxide is converted by plants and other photosynthetic organisms to energy-rich molecules …
Which enzyme is responsible for photorespiration?
RUBISCO
Photorespiration is initiated by the oxygenase activity of ribulose-1,5-bisphosphate-carboxylase/oxygenase (RUBISCO), the same enzyme that is also responsible for CO2 fixation in almost all photosynthetic organisms.
What does CAM stand for in plants?
Crassulacean acid metabolism (CAM) is a photosynthetic adaptation to periodic water supply, occurring in plants in arid regions (e.g., cacti) or in tropical epiphytes (e.g., orchids and bromeliads).
What causes Photorespiration?
Photorespiration is a wasteful pathway that competes with the Calvin cycle. It begins when rubisco acts on oxygen instead of carbon dioxide.
Is Photorespiration good or bad?
Photorespiration is bad for C3 plants because this process causes a decrease in the productivity of a plant, hence it is also called the wasteful process.
Is RuBisCO globular or fibrous?
RuBisCO is a globular molecule with a number of small and large subunits and is going to be the central molecule used in this practical.
What causes photorespiration?
Why is photorespiration a problem?
Biochemical studies indicate that photorespiration consumes ATP and NADPH, the high-energy molecules made by the light reactions. Thus, photorespiration is a wasteful process because it prevents plants from using their ATP and NADPH to synthesize carbohydrates.
Is aloe vera a CAM plant?
The best known are the crassulacean acid metabolism (CAM) plants, particularly the species of the genera Opuntia, Agave, and a liliaceous species, Aloe vera. Another common feature of CAM plants is succulence, characterized by cells with large vacuoles, called hydrenchyma.
Is Onion a CAM plant?
(D) Pea. Hint: Crassulacean acid metabolism which is also called as the CAM photosynthesis, is a carbon fixation pathway that advances in certain plants in order to adapt in the arid conditions. Since the desert plants have very less water for the metabolism, the CAM pathway is used.
