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Thread: effects of wavelength to photosynthesis?

  1. #1 effects of wavelength to photosynthesis? 
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    hii im a college student, and i need to make a research paper on biology. i chose to research about the effects of wavelength to the rate of photosynthesis of a type of plant. do you have any suggestions on how i can manipulate the variable and how i could measure the rate of photosynthesis? thank you!!


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    Bullshit Intolerant PhDemon's Avatar
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    The easiest way to manipulate the wavelength of light getting to the plant is to use a white light source (a normal light bulb is fine) but pass it through filters that cut out all but a narrow wavelength of light (these can be bought but can also be made in-house).

    For easy ways of measuring photosynthesis rate, see here: Measuring the rate of photosynthesis


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    Quote Originally Posted by aglioalia View Post
    hii im a college student, and i need to make a research paper on biology. i chose to research about the effects of wavelength to the rate of photosynthesis of a type of plant. do you have any suggestions on how i can manipulate the variable and how i could measure the rate of photosynthesis? thank you!!
    An additional possibility beyond PhDemon's excellent suggestion is to use LEDs. You would be limited to a relatively small set of wavelengths, but that might suffice nonetheless (indeed, their narrow spectra might even be of use to you). Highly efficient LEDs are available in wavelengths from about a micron down to about 350nm.
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    thanks for both of your replies! however i'm afraid if my research sounds so easy for my stage of education right now . thank youu
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    Forum Freshman Robbedoes's Avatar
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    Quote Originally Posted by aglioalia View Post
    hii im a college student, and i need to make a research paper on biology. i chose to research about the effects of wavelength to the rate of photosynthesis of a type of plant.
    I once read a paper of people that found in certain plant species that they use the 'entire' visible spectrum and chloroplasts(which reflect green light) are only on the 'leaf-surface'. Bellow the surface there are 'chloroplasts' that absorb green light. Is this related to your research?
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    Quote Originally Posted by Robbedoes View Post
    Quote Originally Posted by aglioalia View Post
    hii im a college student, and i need to make a research paper on biology. i chose to research about the effects of wavelength to the rate of photosynthesis of a type of plant.
    I once read a paper of people that found in certain plant species that they use the 'entire' visible spectrum and chloroplasts(which reflect green light) are only on the 'leaf-surface'. Bellow the surface there are 'chloroplasts' that absorb green light. Is this related to your research?
    Please cite a reference for your claim that chloroplasts below the surface absorb green light. Your claim is seemingly at odds with the observed fact that leaves are green, and thus reflect green light away from the surface.
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    Forum Freshman Robbedoes's Avatar
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    Quote Originally Posted by tk421 View Post
    Please cite a reference for your claim that chloroplasts below the surface absorb green light. Your claim is seemingly at odds with the observed fact that leaves are green, and thus reflect green light away from the surface.
    Not all green light gets reflected.

    https://academic.oup.com/pcp/article/50/4/684/1908367
    Last edited by Robbedoes; January 26th, 2019 at 08:01 AM. Reason: forgot something
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    Quote Originally Posted by Robbedoes View Post
    Quote Originally Posted by tk421 View Post
    Please cite a reference for your claim that chloroplasts below the surface absorb green light. Your claim is seemingly at odds with the observed fact that leaves are green, and thus reflect green light away from the surface.
    Not all green light gets reflected.

    https://academic.oup.com/pcp/article/50/4/684/1908367
    Thank you! That paper is very, er, illuminating.

    The work raises the question (but does not answer) why leaves evolved to reflect away so much of the colour that they can otherwise use so efficiently. Very interesting. Perhaps it's that "too much of a good thing is a bad thing".
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    ^I would say that evolution is just displaying its stochastic and heuristic nature.
    I was some of the mud that got to sit up and look around.
    Lucky me. Lucky mud.
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