Lecture 20: Photosynthesis

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Lecture 20 Photosynthesis  
By the end of this lecture you should be able
to Describe photosynthesis as an ecological as
well as a physiological process. Provide an
overview of the mechanics of photosynthesis. Conc
epts and terms light and dark reactions, redox
reactions  Discuss anatomical features of leaves
important for photosynthesis. Concepts and
terms leaf anatomy, chloroplast structure,
grana, stroma  
Describe the energy transformations in the light
reactions. Concepts and terms light
absorption, chlorophyll, photosystems I and II,
action spectrum, NADPH, ATP, cyclic and
non-cyclic e flow. Describe chemiosmosis. Describe
the Calvin cycle. Concepts and terms RUBISO,
3PG Assigned reading Chapter 10 in the text.
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Figure 10.0 Sunbeams
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Figure 10.1 Photoautotrophs
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Autotroph
From Larcher.
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Photosynthesis and respiration are redox
reactions.
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Average bond energies, kcal/molas found in CO2
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Figure 10.4 An overview of photosynthesis
cooperation of the light reactions and the Calvin
cycle (Layer 1)
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Figure 10.4 An overview of photosynthesis
cooperation of the light reactions and the Calvin
cycle (Layer 2)
NADP Nicotinamide Adenine Dinucleotide Phosphate
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Figure 10.4 An overview of photosynthesis
cooperation of the light reactions and the Calvin
cycle (Layer 3)
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Photosynthetically active radiation.. 400 to 700
nm.
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• Non-cyclic electron transport
• Photophosphorylation

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Cyclic electron transport
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Chemiosmosis
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Figure 10.x1 Melvin Calvin
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Photosynthesis can be broadly separated into
light reactions - light dependent dark
reactions - light independent
Light reactions are involved in the
oxidation of water to oxygen reduction of NADP
to NADPH and ATP occur in thylakoid
membranes Dark reactions use NADPH and ATP to
fix CO2 into CH2O occur in stroma matrix of
chloroplasts
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