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
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