The below mentioned article provides a notes on Control of Photorespiration. Photorespiration is apparently a wasteful process because quite a large amount of recently fixed carbon is lost by re-oxidation to CO2. Lorimer and Andrews in 1973 suggested that oxygenation of RuBP is unavoidable because with the present gaseous composition of the atmosphere, photosynthesis via the C3 cycle is obligatorily [...]
The below mentioned article provides a summary on Co2 Concentrating Mechanisms in CO2 Fixation Pathways. When the terrestrial plants first appeared in the ancient geologic time, the atmospheric CO2 concentration was several fold higher than today. Ultimately, the CO2 concentration became reduced to the present low values. It is believed that the relative abundance of land plants was mainly responsible [...]
The upcoming discussion will update you about the comparison among C3, C4 and CAM. Comparison # C3: 1. Plants operate Calvin Cycle only in all green cells. 2. There is only one CO2 acceptor, i.e., RuBP. 3. The first stable product of photosynthesis is PGA (a C3 acid). 4. "Kranz anatomy" is not found. There is no chloroplast dimorphism. They [...]