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Photosynthesis
Lock and Key of Earth
Topic #2015Matt Jakubik
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Why Learn About Photosynthesis?
• Photosynthesis is the most important chemical reaction on earth.
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What is it?
• Process plants use to convert carbon dioxide and water into sugar and oxygen
Picture taken from Life: The Science of Biology, 4th edition, by Sinauer Associates and WH Freeman
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Plants as Autotrophs
• Autotrophs: Make their own energy
• Heterotrophs: Get energy from other living organisms
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Light• How do plants make their energy?
• Is all light the same?
• The more the better?
• What properties does light have?
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Wavelength
is the
symbol for wavelength
• Energy of light is inversely related to the wave length
Picture taken from Life: The Science of Biology, 4th edition, by Sinauer Associates and WH Freeman
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Light quality• Spectrums
• Visible light
• Plants mainly use Red and Blue
• Why are plants green?
Picture taken from Life: The Science of Biology, 4th edition, by Sinauer Associates and WH Freeman
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Light Quantity
• Measured in micromoles/m²
• Light quantity is the amount of light that hits a surface
• What variables can you think of that would affect light quantity?
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Duration• Generally referred to as daylength in
the field.• Affects flowering, bulbset, tuberset,
germination, budset… etc.
• What are some benefits of greenhouse lighting? (think back to what we discussed in the last slide)
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Two Types of Photosynthesis
C3-has 3 carbon chainsC4-has 4 carbon chains
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C3 Plants
Cannot increase increase rate of photosynthesis when light intensity is greater than 1/3-1/2 full sunlight
Examples-soybeans, cotton, potatoes, alfalfa, sugarbeets, cool season grasses
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C4 Plants
Can continue to increase their rate of photosynthesis past full sunlight
Examples-corn, sorghum, sugarcane, and warm season grasses
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So Where Does the Light Go to Do It’s Thing?
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Plant Cell Structure• The following are
important to know• Xylem• Phloem• Guard cell• Stoma• Chloroplasts
Picture taken from Life: The Science of Biology, 4th edition, by Sinauer Associates and WH Freeman
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Plant Organelle Function
• Xylem• Phloem• Guard Cell• Stomata
Stomata
Picture taken from Life: The Science of Biology, 4th edition, by Sinauer Associates and WH Freeman
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The All Important Chloroplast
• What is the chloroplast?
• What is chlorophyll?
• Thylakoids?
Picture taken from Life: The Science of Biology, 4th edition, by Sinauer Associates and WH Freeman
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Formula for photosynthesis
6H2O + 6CO2 ----------> C6H12O6+ 6O2
In English terms.Where does light fit in?
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Factors affecting photosynthesis
• CO2 concentration• Temperature• Available water• Light