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Re: Why plants turn red
>And IMO, not a very good theory when it comes to figuring out why aquatic
>plants turn red. Most of the bright red plants that we use in the aquarium
>are NOT red when grown emersed in in full sun. Only the submersed foliage
>is red. That would make no sense if the purpose is to protect the plant
>from burning in the sun.
Could it be that anthocyanin is more important as "suncreen" under water
because of some physical difference of the sumbersed and emersed leaves?
Here is an interesting article which is very updated on light and growth
.. more specific:
"Light signals and the growth and development of plants"