Abstract
Leachates from coniferous leaf litter prepared under laboratory conditions contained basic and acidic ethyl acetate-soluble growth regulating factors, including growth inhibitors and compounds showing gibberellin-like activity. The dynamic of the release of leachates from needle litter when percolated with tap water and the effect of substances leached on test plants were studied. By means of PC combined with the lettuce biotest the active substances could be distinguished. The substances showing gibberellin-like activity appeared on the paper chromatogramms run with isopropanol, ammonia, water (IAW 10 :1 :1 v/v/v) at Rf to and to depending on the needle litter concerned. According to other investigators it could be shown that polyhydroxyphenols are present in the leachates of coniferous leaf litter. These are the agents implicated in an inhibitory role.
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