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Unformatted text preview: opy Architecture
Factors Affecting Photosynthesis How is photosynthesis measured?
• Portable photosynthesis meter
• Measured gases entering and gases exiting chamber
gas exchange meter puts air into the chamber and out of the chamber
the difference is amount it used. It measures net photosynthesis Factors Affecting Photosynthesis Net photosynthesis
it is - 0.5V0 bc it releases CO2 where it suppose to use it. An = Vc – 0.5Vo - R
• An = net photosynthetic (assimilation) rate ( mol m-2 s-1)
Vc = carboxylation rate of RUBISCO
Vo = oxygenation rate of RUBISCO (photorespiration)
R = respiration rate (i.e. leaf mitochondria, or roots etc)
using sugar to release CO2 for every 4 reaction that rubisco one of them is photorespiration in the dark Rubisco is not working cause no photon, so during night the net rate of carbon dioxide
exchange is negative because we are only having Respiration rate happening through the mitochond
Factors Affecting Photosynthesis Text Light
660-450 • Light Quality (Color)
– Chlorophyll absorbs light
between red (660 nm) and
blue (450 nm)
– These are the
wavelengths of light
• Called Photosynthetically
Active Radiation (PAR) Factors Affecting Photosynthesis as you add more light, it saturates bc not enough enzyme • Intensity
– Saturation point
• In low light,
photosynthesis – Photoin...
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This document was uploaded on 01/17/2014.
- Winter '08