Photosynthesis in Higher Plants
Factors affecting photosynthesis
- Blackman started that when a process is induced by a number of separate factors for the rapidity of the process, the rate of the process is limited by the speed of the slowest factors.
- Increase in the CO2 concentration to 0.05% increase the rate of photorespiration above which it shows a decline.
- Threshold value (or) compensation point (Cp) is the point at which, plant parts fixing CO2 will be equal to CO2 evolved in photorespiration/respiration.
- Cp value for C3 and C4 plants are 25-100 and 0.10 ppm.
- A point in light intensity where there is no gaseous exchange is called light compensation point.
- Maximum photosynthesis occurs in blue-violet and red light.
- Red light enhances carbohydrate accumulation, while blue light stimulates protein synthesis.
- The optimum temperature for C3 plants ranges from 10°C-25°C and is 30°C-45°C for C4 plants.
- O2 is required in a minimum amount for photosynthesis.
- At very high O2, the rate of photosynthesis is declined which is referred to as Warburg effect.
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