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Coloured light and plants

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Coloured light and plants

Postby Hickory » Tue Feb 07, 2006 10:53 am

Hellosies again!

In class, we're looking at how coloured light (one colour from the visible spectrum ie Red) affects plants. I understood some of it, but wondered how this could affect plants right from a seedling. Please could someone explain the process to me, and what kinds of coloured light don't help plants grow and why?

Thanks
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Re: Coloured light and plants

Postby zami'87. » Tue Feb 07, 2006 9:22 pm

Hickory wrote:Hellosies again!

In class, we're looking at how coloured light (one colour from the visible spectrum ie Red) affects plants. I understood some of it, but wondered how this could affect plants right from a seedling. Please could someone explain the process to me, and what kinds of coloured light don't help plants grow and why?

Thanks


As I remember red induces and far red inhibits germination. Blue affects on opening of stomata and bending toward light. Of course if u look on action spectrum of photosynthesis you'll notice that blue and red light are most effective(pigment molecules absorb energy of photons of specific light spectrum portion-wavelengfht.. and elevate electron in higher energy state). ...
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Postby Hickory » Wed Feb 08, 2006 9:08 am

Thankyou very much! Yes, we're looking at the effectiveness of coloured light now, and green is the most interesting to me!
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Postby Dr.Stein » Wed Feb 08, 2006 9:17 am

Plants don't absorb green, they reflect it, that's why we can see leaves are green 8)
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chlorophyll is sweet

Postby HayleyNasman » Thu Feb 09, 2006 9:30 pm

I've been very interested in this, as well. Wikipedia goes into more detail about the organic chemistry of chlorophyll, you should look it up. There are many other pigments like it, called chelates, that are color specific. Hemoglobin is one - much like chlorophyll, except for it contains a central iron atom in its structure where chlorophyll has a magnesium atom.

Check this out.
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"Nothing is too wonderful to be true, be it consistent with the laws of nature."
- Michael Faraday
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Coured light and plants

Postby shelarsanjana » Tue Feb 21, 2006 4:16 am

Hello!
Me and some af my classmates are doing an experiment studying the effect of coloured light on the germination of seeds. we don't know exactly what should happento them, but right now, the one's in the red light have grown the tallest, but the ones in yellow light are the greenest.
The ones in green light are sickly, but have very wide stems. So, we are slightly lost. Can you help us?
I'm ffrom the Mahindra United Wrold College of India
Thanks, Sanjana.
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Postby seminarska » Wed Mar 01, 2006 12:35 pm

hello everibody!
Me and some of my classmates are doing an experiment studying the effect of coloured light(different wave lengths) on GROWTH AND DEVELOPEMENT OF PLANTS. If anyone should know anything about this reserch area, or where we could find some more information about it, please let us know!
We have found a lot of articles about experiments with light quality on germination of seeds, but nothing about how different lihght colors effect 'adult' plants. We are growing our plants (beans) under green, red, far-red, blue and day light. The day and night cicle is 16/8 hours. They are being exposed to the specific light the whole 'day' - 16hours.
Thanks, Zala
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Postby Nawal » Wed Mar 08, 2006 2:10 pm

Hello Zala,
About the effect of the color light on the germination of seeds , the color light effect certain growth factors [hormones ] that may give the plant different characteristics .but in the case of adult plant different light color will effect the rate of photosynthesis depending on light observing by different kind of chlorophyll.
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Postby amirm11 » Sat Dec 02, 2006 11:37 pm

Hi
In school we are learning about plants and i need to know how does colour lights affect plant growth?
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Re: Re:

Postby invisible4good » Wed Jan 21, 2009 4:06 pm

seminarska wrote:hello everibody!
Me and some of my classmates are doing an experiment studying the effect of coloured light(different wave lengths) on GROWTH AND DEVELOPEMENT OF PLANTS. If anyone should know anything about this reserch area, or where we could find some more information about it, please let us know!
We have found a lot of articles about experiments with light quality on germination of seeds, but nothing about how different lihght colors effect 'adult' plants. We are growing our plants (beans) under green, red, far-red, blue and day light. The day and night cicle is 16/8 hours. They are being exposed to the specific light the whole 'day' - 16hours.
Thanks, Zala


I don't want to trouble you but i am doing an experiment so similar to this; it is for a school science fair, and i need to begin setting it up,but i am extremely new to how the science fair works and i have never conducted an experiment as such before. You seem to know what to do; as in procedure... could you explain how specifically you are going about this experiment? The light part is confusing, i mean how long to expose the plants to the colored light and i too wanted to leave one in natural light (ack, the temperature would not be a constant then...) but i don't know how long to expose it to the artificial light to keep it in accordance with the sunlight. Do you turn on the artificial lights over the plants at dawn when the sun rises and turn them out when it sets? (or maybe i should eliminate the plant that is exposed to sunlight so i do not have to worry about this detail?!) Help, please!! Are you measuring your plants every day? How long is the span of your experiment? What exactly would you graph? the height of each plant over the consecutive days? Do you graph the green-ness/ color of the plants and such or just record this data?
Please help, much thanks,
- A.F.
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