Lecture6Photosynthesis

Lecture6Photosynthesis - From last day Wavelength of...

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From last day…
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Wavelength of light (nanometers)
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Photosynthesis Photosynthesis vs. vs. Primary Production Primary Production
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sunlight water uptake carbon dioxide uptake ATP ADP + P i NADPH NAD + glucose P oxygen release LIGHT INDEPENDENT REACTIONS LIGHT DEPENDENT REACTIONS new water Photosynthesis occurs in two stages: The Light-Dependent & the Light-Independent Reactions (thylakoid) (stroma) NADP+
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Visible light is a rainbow of colors = light “quality” Photosynthetic organisms use pigments to capture light of various colors Pigments are the “molecular bridge” between sunlight and photosynthesis Light Capture Wavelength of light (nanometers) High energy Low energy
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Relative absorption wavelength (nanometers) wavelength (nanometers) chlorophyll b chlorophyll a beta-carotene phycoerythrin (a phycobilin) Each pigment contains a group of atoms that can absorb photons of different energies, which correspond to different colors of light
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chlorophyll b chlorophyll a carotenoids phycoerythrin (a phycobilin) (combined absorption efficiency across entire visible spectrum) chlorophyll a chlorophyll b phycocyanin (a phycobilin) Why do green plants or algae look green?
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Chlorophyll a Chlorophyll a is the main light harvesting pigment in most photosynthetic organisms Oceanographers measure this as a “proxy” for phytoplankton biomass
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Pigments that fill in the chlorophyll absorption gaps are called accessory pigments Carotenoids are a group of accessory pigments These differ in the kinds and amounts between species/algal groups β -carotene
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Photosynthetic pigments are located on the thylakoid membrane are organized into clusters with proteins called Photosystems Photosystem = Proteins + 200-300 pigment molecules
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