Plants channeling light into their roots?

Without magic, is it possible for a plant to channel light (all colors) to/through its roots?

What I'm thinking is having a giant cavern with a bunch of these plants above. The roots go down and cover the ceiling of the cave. When the sky is blue the roots either turn blue and/or give off a blue light. If there are clouds in the sky they are seen in the cave. In a way that's like a camera on the surface and a screen on the roots. Or have the whole plant change color, like a chameleon, to show what is above.

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Plants channeling light into their roots?

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