Transcript Photosynthesis - sun and shade leaves

REWM 3500
Rangeland Plant Ecophysiology
Friday, September 4, 2009
The light environment of plants and
photosynthetic adaptations
• Light response curve of photosynthesis
• Adaptation and acclimation to variable light
conditions
9.7 Response of photosynthesis to light in a C3 plant
9.8 Light-response curves of photosynthetic carbon fixation in sun and shade
plants
9.10 Light-response of photosynthesis of a sun plant grown under sun or shade
conditions
9.11 Changes in photosynthesis in individual needles, a complex shoot, and a
forest canopy
9.1 Leaf anatomy from a legume (Thermopsis montana) grown in different light
environments
Sun
Upper palisade parenchyma
Lower palisade parenchyma
Spongy parenchyma
Shade
Terms to know:
Light response curve
Light compensation point (LCP)
Apparent light use efficiency (phi, θ) – initial slope
Maximum rate of photosynthesis - Amax
Dark respiration (Rd)
Light limited part of curve
Carboxylation limited part of curve
Sun and shade leaves
Palisade layer
Spongy layer
Grana stacks
Leaf level adaptation and acclimation