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If you took the chemicals a plant gains through photosynthesis and put it through the plants' roots or by tubes, would the plant need light? If not, how would it respond to the treatment?

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Are you suggesting that someone would artificially supply a plant with sugar, proteins, lipids, etc. via the roots? Isn't that sort of like putting a plant on a feeding tube? –  Meg Coates Feb 21 '12 at 19:11
    
Yes. Would it work? –  J. Musser Feb 22 '12 at 2:03
    
This approach can be used to culture mycorrhizae jstor.org/stable/3760183 –  David Mar 7 '12 at 2:53

2 Answers 2

I doubt this would work for the vast majority of plants. I think it would cause root rot as the microorganisms in the soil would out-compete the plant. Also the transport systems of the plant might not be efficient in this direction.

I mean might there be a plant somewhere where this might work? Sure. Fungi that grow in the dark would be a lot like such plants, so its biologically possible. There might be a primitive plant that doesn't need its chloroplast to be active to live. I've never heard of one and wikipedia is not helping here...

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Not exactly the same thing, but a species of algae has been genetically altered to allow it to uptake glucose, bypassing the need for photosynthesis: http://www.unisci.com/stories/20012/0615013.htm

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