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Elsewhere on the web I read that abscisic acid is responsible for geotropism (roots growing downwards). Could some expert confirm this and put it in the article if it's true?
It isn't true. The downward growth of roots is due to stratoliths, auxins, and gravity. The stratolith effect is still being studied by botanists because it is still not fully understood.
[edit] Diphenhydramine
I've seen various people in the online heroin community referring to diphenhydramine (active ingredient in Benadryl) as "dormin". Apparently, heroin is frequently cut with that stuff. But "dormin" only redirects here. Confusing. --63.25.108.100 03:38, 31 October 2007 (UTC)
Abscisic acid is transported via the xylem and the phloem, it is more abundant in the pholem. —Preceding unsigned comment added by 129.120.54.171 (talk) 20:53, 22 April 2008 (UTC)