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How Colored Lights Affect Plant Growth

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caroline smith

on 10 June 2013

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Transcript of How Colored Lights Affect Plant Growth

How Colored Lights
Affect Plant Growth 2 main factors of light that affect photosynthesis:
Quantity (# of photons)
Quality (wavelength)
Product: amount of energy Procedure: Chlorophyll --> inside the photosystems with other accessory pigments. These catch the light to be used in photosynthesis. Hypothesis If the light shining over a plant has a shorter wavelength, the plant will grow faster than a plant under a light with a longer wavelength because it is under a light with more energy. Materials 48 plastic cups filled w/ soil and 1 ungerminated sugar snap pea seed per cup
6 cups per box, 7 boxes with a red, orange, green, blue, purple, or white light hanging above connected to a timer to turn on and off at the same time each day
6 sunlit plants, try to give these same light quantity as others
1 tbsp of water every day at the same time per cup for 21 days after the first plants start growing
measure the plants' stems in cm at the same time every day Thesis This experiment will be observing the
differences in rates of sugar snap
pea plant growth using different
color light sources, and analyzing the
results and determining the best light
color for fast pea plant growth. Discussion: colored lights do affect plant growth Blue: White: Green: Purple: Yellow: Sunlight: Sources of Error: Conclusion: Orange/Red: Human error (incorrect measurements in procedure and observations)
Cellophane paper for orange/purple
box problems (hole in the flaps, distance from light to the plants)
the sunlit plants blue wavelength --> optimal energy for photosynthesis
photosynthesis will occur more quickly w/ the right amount of energy
photosynthetic pigments can absorb this wavelength most, most beneficial for the plant to perform photosynthesis
best QUALITY and a high QUANTITY (penetrates atmosphere well) similar growth rate to blue but slower
white light composed of entire visible spectrum ROYGBIV
therefore: plants able to absorb all the optimal wavelengths for photosynthesis
however: also absorbs all the wavelengths that caused less growth 3rd highest, should have been one of lowest, chlorophyll reflects green light
maybe the green light used:
absorbed by carotenoids/accessory pigments
had a wavelength closer to blue, not the one reflected by plants --> QUALITY close to blue's the orange and red lights had similar growth rates
orange used was very red (as w/ purple b/c cellophane paper)
absorbed very well by chlorophyll, should have been more than green
large red-orange range of light in sun --> evolutionarily beneficial to be able to absorb more
(best QUANTITY) similar growth rates as red/orange
pigments absorb as much purple as red or orange
shorter wavelength yet not higher absorption
too much energy for the plant so it needed to restrict some of the energy slowest growth rate w/ lightbulb: no pigments absorbed any yellow wavelengths
yellow is also reflected from plants: why they are yellowish green
evolutionarily, there is probably not enough yellow light in most light sources (does not have the QUALITY nor the QUANTITY)
plants evolved to absorb less slowest growth by far: hardest to control
weather: affected amount of sunlight / day
time: duration of light changed every day, as well as differed from other plants
temperature: temp in boxes controlled, temp of sunlit plants depends on time and temp of room (effect on photosynthesis)
intensity: sun changes position rel. to plants throughout the day so diff amounts of light at diff times of day hypothesis proved incorrect
purple light had slower growth rate than blue light, yellow had slower growth rate than red
hypothesis did not take quality into account: higher QUANTITIES of red and blue
blue & white lights: most beneficial for plants to grow under
yellow & green lights: least beneficial for plants, why they are reflected by chlorophyll Relevance to today can be used to find best quality of light for growing
eg. farming, gardening
can be used to slow down/speed up growth for observation in experiments
can be used to decrease need for extra resources/help with scarcity
to determine if growing plants using artificial light is more efficient/effective than growing plants with sunlight as the light source "When electric sources produce light, the wavelength is influenced by many things. For instance, a tungsten filament in an incandescent bulb emits more light with long wavelengths (the reds) when it is relatively cool, and more short wavelengths (the blues) when it is relatively hot." Vandre, Wayne. "Fluorescent Lights for Plant Growth." University of Alaska Fairbanks. Cooperative Extension Service, n.d. Web. 24 Apr. 2013. <http://www.uaf.edu/files/ces/publications-db/catalog/anr/HGA-00432.pdf>. Why sugar snap pea plants? Easy to grow (do not require high maintenance)
Not too big in size
Grow quickly (were able to fully mature in a few weeks)
Easily accessible By Caroline Smith and Sydney Reynolds References Jackie D. "Requirements for Plant Growth." Requirements for Plant Growth. N.p., 18 July 2012. Web. 05 Feb. 2013. <http://www.aces.uiuc.edu/vista/html_pubs/hydro/require.html>.
"AZ Master Gardener Manual: Environmental Factors." AZ Master Gardener Manual: Environmental Factors. The University of Arizona, 1998. Web. 04 Feb. 2013. <http://ag.arizona.edu/pubs/garden/mg/botany/environmental.html>.
Danielle Dunn, edublogs, 2011. Web. <http://dedunn.edublogs.org/2011/06/08/chlorophyll-and-absorption-of-light/>.Butler,
Madigan, Jay. "What Wavelength Goes With a Color?" What Wavelength Goes With a Color? National Aeronautics and Space Administration, n.d. Web. 06 Feb. 2013. <http://science-edu.larc.nasa.gov/EDDOCS/Wavelengths_for_Colors.html>.
"Light and Color @ The Franklin Institute." Light and Color @ The Franklin Institute. The Franklin Institute, n.d. Web. 06 Feb. 2013. <http://www.fi.edu/color/color.html>.
Raven, Peter H. "How Plants Grow in Response to Their Environment."Http://www.mhhe.com/biosci/genbio/raven6b/graphics/raven06b/other/raven06_41.pdf”. McGraw-Hill Higher Education, Jan. 1996. Web. 2 Feb. 2013.
Miller, Ken. "Photosynthesis: Introduction." Photosynthesis: Introduction. Pearson, n.d. Web. 07 Feb. 2013. <http://www.phschool.com/science/biology_place/biocoach/photosynth/intro.html>.
Richard E. Barrans Jr., Ph.D; Argonne National Laboratory, 2012. Web. <http://www.newton.dep.anl.gov/askasci/phy99/phy99523.htm>.
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