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Naturally-occurring growth regulators in leaf washings of Picea sitchensis (Bong.) Carr and Betula pendula Roth
1Institute of Tree Biology, c/o Department of Forestry and Natural Resources, The University, King's Buildings, Mayfield Road, EH9 3JU, Edinburg, UK.
Abstract:
Leaf washings were collected during and immediately after periods of rainfall ('natural') from Picea sitchensis (Bong.) Carr and Betula pendula Roth., growing in the field. They contained acidic and non-acidic ethyl acetate-soluble growth regulating factors, including a gibberellin-like compound and an inhibitor resembling abscisic acid (ABA). Similar ranges of growth regulators were obtained when needles of Picea sitchensis were intermittently sprayed with a fine water mist ('artificial') in glasshouse conditions, greater amounts of an ABA-like compound occurring per unit volume of spray when intervals between spray applications were shortened.
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