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

Disclaimer: may from time to time provide links to third party Internet sites under their respective fair use policy and it may from time to time provide materials from such third parties on this website. These third party sites and any third party materials are provided for viewers convenience and for non-commercial educational purpose only. Compete does not operate or control in any respect any information, products or services available on these third party sites. makes no representations whatsoever concerning the content of these sites and the fact that has provided a link to such sites is NOT an endorsement, authorization, sponsorship, or affiliation by with respect to such sites, its services, the products displayed, its owners, or its providers.