Factors affecting photosynthesis
Photosynthesis is influenced by both environmental and genetic factors. The environmental factors include light, availability of CO2, temperature, soil, water and nutrient supply apart from age of leaf, leaf angle and leaf orientation. Photosynthesis is not affected by all environmental factors at a given time.
According to Blackmann who postulated Law of Limiting factor in 1905, photosynthesis is limited by slowest step of the most limiting factor in the pathway. This means that at a given time, only the factor that is most limiting among all will determine the rate of photosynthesis. For example, if CO2 is available in plenty but light is limiting due to cloudy weather, the rate of photosynthesis under such situation is controlled by the light. Further, if both CO2 and light are limiting, then the factor which is the most limiting of the two will control the rate of photosynthesis.


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