Emerson Red Drop and Enhancement Effect
•The rate of photosynthesis is measured as the number of O2 molecules produced per quantum of light absorbed
• Robert Emerson et al (1958): Experimental material Chlorella
• Studying rate of photosynthesis at different wavelengths of light (390-760 nm)
• Monochromatic light of different wavelength is used and rate of photosynthesis is measured
• The sudden fall in photosynthetic yield in the far red region (greater than 680 nm) compared to the red region of the electromagnetic spectrum is called “Emersons red drop”
• The increase in photosynthetic yield by the combined effect of red (680 nm) and far red light (700 nm) is called Emerson enhancement effect or Emerson effect.
• This work provide experimental evidence for the presence of two photo systems-PS I & PS II