In red algae, the action spectrum is blue-green light, ..
(red, blue, green) would influence the plant to produce the most amount of photosynthesis.
Botany: Why is photosynthesis maximum in red light? …
Above 700 nm, the photon energy is too low to activate the photosynthetic process via the chlorophylls and various cartenoids. However, the phytochrome photopigment, which is responsible for stem elongation, leaf expansion, shade avoidance, neighbor perception, seed germination, and flower induction, has two isoforms called Pr and Pfr. In its ground state Pr, phytochrome has a spectral absorbance peak of 660 nm. When it absorbs a red photon, it converts to its Pfr state, which has a spectral absorbance peak of 730 nm. When the phytochrome molecule absorbs a far-red photon, it converts back to its Pr state, and in doing so triggers a physiological change in the plant.
Some plants and plantlike organisms have developed other pigments to compensate for low light or poor use of light. Cyanobacteria and red algae have phycocyanin and allophycocyanin as accessory pigments to absorbe orange light. They also have a red pigment called phycoerythrin that absorbs green light and extends the range of photosynthesis. The red pigment is found in vegetables. Some red algae are in fact nearly black, so that increases their photosynthetic efficiency. Brown algae have the pigment fucoxanthin in addition to chlorophyll to widen their absorption range. These red and brown algae grow to depths around 270 meters where the light is less than 1% of surface light.
molecules in the plant cell absorb light ..
To test this we used about 5 grams of leaves for each trial, and placed them in a gas chamber. On two sides of the gas chamber we placed two clear containers filled with water to serve as the temperature regulators. Behind the water containers we placed lights directed at the plant. We ran three trails for each different leaf we used. Each trail consisted of measuring the amount of CO2, with a CO2 gas sensor under blue light, red light, and green light. We made sure to switch the order of colors in each trail as an experimental control, to minimize error. Since we know that photosynthesis requires CO2, and we know that blue light pigments absorb the most light energy, we predicted that under blue light the most CO2 would be used.
Other accessory pigments are mainly carotenoids, which mainly utilize blue and violet light.One source with utilization spectra of various plant photopigments andan overall "action spectrum" for a specific plant frequently studied forphotosynthesis:The same action spectra are also availableThe specific plant species chosen here appears to me to have spectral responsepeaks corresponding to those of Chlorophyll A, but has significantutilization of red wavelengths 625 to 680 nm and violet, blue and green-bluewavelengths 400 to 495 nm.Another "action spectrum" is available at:, specifically Fig.
Why the rate of Photosynthesis is higher in red light …
One possible explanation for our results is that due to the high-energy nature of blue light, some of the blue light shining onto the juniper needles is absorbed by plant pigments other than the chlorophylls and is not transferred to the photosynthetic reactions.
High pressure sodium lamps havea significant very yellowish green spectral emission feature around 568-569nm, but that one is not as well utilized by plants as red and bluewavelengths are - that wavelength is mainly useful for usefulness to humanphotopic vision.Although stimulating only one photopigment is sufficient for photosynthesis,many plants have some requirement of stimulating more than one photopigmentor at least one other than the red utilization of Chlorophyll A for propergrowth regulation, flowering and fruiting.
Effects of Blue and Red Light on the Rate of Photosynthesis
This tutorial introduces photosynthesis
Photosynthesis - Wikipedia
Other sections include animal systems, ..
Braddock, B., ..
Even when light gets to a plant, ..
What is photosynthesis
Plants mostly absorb red and blue wavelengths.
Terashima, I., T. Fujita, T. Inoue, W. S. Chow, and R. Oguchi. 1009. “Green Light Drives Leaf Photosynthesis More Efficiently than Red Light in Strong White Light: Revisiting the Enigmatic Question of Why Leaves are Green,” Plant & Cell Physiology 50(4):684-697.
Colored leaves have chlorophyll too
As a reminder, photosynthetically active radiation (PAR) does not consider the spectral response of plants (FIG. 3); it simply represents the number of photons (quanta) per unit area per second within the range of 400 to 700 nm. With the availability of color-tunable LED modules for greenhouse lighting, horticulturalists will likely want to experiment with different SPDs for specific crops and flowering plants, as well as both the directionality and daily timing (photoperiods) of the luminaires. Regardless, being able to convert predicted and measured illuminance values to PPFD values for common light sources will certainly ease the communication problem between lighting designers and horticulturalists.
"The chlorophyll needed for photosynthesis is ..
In addition to using chlorophylls and carotenoids for photosynthesis, plants use these and other photopigments for a wide variety of functions. The phytochromes Pr and Pfr, for example, respond to 660 nm red and 735 nm infrared radiation respectively, and in doing so induce seed germination and flowering, regulate leaf expansion and stem elongation, and trigger photoperiod and shade avoidance responses (see Appendix A).
Micromoles and Plant Photosynthesis | Smart Grow …
How horticulturalists choose to balance the ratio of red to blue light will likely depend on the specific plant species being cultivated and their stage of growth. Some plants like shade, while others prefer direct sunlight, with different SPD requirements. In addition, far-red 735 nm LEDs may be employed to induce flowering. Regardless, the above conversion factors will still be useful.
Photosynthesis | Definition of Photosynthesis by …
It will be very interesting to see how light will influence the rate of photosynthesis in plants and what will happen if they do not get the required light in order to produce starch .
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