Photosynthetic Pigments: The effect from coloured lighting


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Photosynthetic Pigments: The effect from coloured lighting

Post by biologyeeisuckx » Mon Jan 24, 2011 11:31 am

I would firstly like to say that im new to the science of biology and far newer to the topic of photosynthetic pigments.

Im in my senior year at school, and have a rather large assessment coming up, but am unaware whether the investigation i want to carry out will give me enough to write about, or even work.

I have been researching answers to the following questions which seem straightforward, but have found conflicting statements and honestly, I am basically confused.

So not to waste anybodys time here are my questions:

1. If I was to offer plants a coloured light, would the plants react, and produce greater quantities of a pigment other than chlorophyll a? (assuming that the colour wasnt in the absorption spectrum of chlorophyll a

2. Would i be able to measure this increase using chromatography?

3. And the most confusing one, if i was to collect different coloured leaves instead and then perform my chromatography on them, what would answer the anomaly that they arn't green in the first place, considering that this is the most effecient absorption spectrum? Why would they change there colour whether on the top or bottom of a tree or during autumn/summer other than poor health, do they not want that much energy perhaps?

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Post by JackBean » Mon Jan 24, 2011 12:07 pm

1. I think that depends on the spectra (what colour would the ligth have) and probably most on the intensity

2. sure

3. the difference would be due to different levels of pigments, either more non-chlorophyll or less chlorophyll or even less of all pigments (etiolated plants).
The question of how much pigments they should produce depends on several factors, as the ligth quality and intensity. If you grew plants in dark, they will be etiolated, that is, they do not profit from having photosynthetic pigments, so they rather save energy and try to grow up more to reach the sunligth.

Cis or trans? That's what matters.

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Re: Photosynthetic Pigments: The effect from coloured lighting

Post by lonniekeenan1 » Tue Dec 06, 2011 6:04 am

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