photosynthesis - purdue agriculture...photosynthesis, where carbohydrates are produced. a typical...
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Photosynthesis
Agronomy 105 2
In words…
Carbon Dioxide + Water + Light Energy
→ Glucose + Oxygen In simplest chemical terms…
CO2 + H20 → CH2O + O2
In more detailed chemical terms…
6 CO2 + 12 H2O → C6H12O6 + 6 O2 + 6 H2O
Photosynthesis
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Photosynthesis Light Reactions
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CELL ANATOMY Middle Lamella Between the cell walls, this is the "glue" that holds adjoining cells together.
The middle lamella is high in calcium; thus calcium deficiencies result in abnormal plant growth.
Cell Wall This is the rigid but porous "building block" of plant cells, and a characteristic that
distinguishes plants from animals. Cell walls are not living material, but without them, plants
would not be able to grow upward.
Nucleus The "brain" of the cell, this contains much of the genetic material and wields control
over many cell functions.
Cytoplasmic membrane This thin semi-permeable layer serves as a "skin", and controls
movement of materials in and out of cells. Through osmosis it maintains turgor pressure for
cell rigidity.
Vacuole This part of a cell gets larger as cells get older, and can occupy a considerable
volume of the cell. It is the "storage" site of not only carbohydrates for food, but also waste
products.
Chloroplast Composed of the stroma and grana, this is the site of "food production" via
photosynthesis, where carbohydrates are produced. A typical cell has about 400 chloroplasts.
Mitochondria The "energy" center for the plant, the mitochondria is the site of respiration, to
power cell activities. A typical cell has about 2000 mitochondria.
Cytoplasm The word means "cell material", this is the living liquid medium, the site for many
cell reactions, and contains all of the organelles.
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Leaf Anatomy
http://preuniversity.grkraj.org/html/3_PLANT_ANATOMY.htm
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• Type of plant, C3 vs. C4
• Light intensity
• Temperature
• Carbon dioxide concentration
• Leaf water potential
• Leaf carbohydrates
• Leaf area index
• Plant maturity
Factors that Influence
Photosynthesis
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Law of the Minimum
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http://www.soilcropandmore.info/crops/Corn/How-Corn-Grows/index.htm
Husks/Cobs
Grain
Leaf Sheaths Stalk
Leaves
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• If corn only utilizes 1% of the sunlight striking the
leaves, what is its ultimate yield potential?
Photosynthesis Efficiency
National Farm Machinery Show
February 2013 Louisville, KY
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The Washington Post