Kok Effect, Tobacco Mutants, 180 2-Uptake, Mass Spectrometry The Kok effect of photosynthesis was investigated in different tobacco mutants. It was found that the breaks in the light intensity curve were always at or around 1000 lux in all plants tested regardless of the unit sizes which differed by a factor of 10. It was concluded that the photo receptor responsible for the effect must be pre...
