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.

View this video for the topic from 0:34 to 12;26

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