Activity of the aldehyde and alcohol of gibberellins A12 and A14, two derivatives of gibberellin A15 and four decomposition products of gibberellin A3 in 13 plant bioassays |
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Authors: | G V Hoad R P Pharis I D Railton R C Durley |
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Institution: | (1) Long Ashton Research Station, University of Bristol, BS18 9AF Bristol, UK;(2) Department of Biology, University of Calgary, T2N 1N4 Calgary, Alberta, Canada;(3) Present address: Botany Department, Rhodes University, P.O. Box 94, Grahamstown, South Africa;(4) Present address: Department of Crop Science, University of Saskatchewan, S7N OWO Saskatoon, Saskatchewan |
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Abstract: | Summary The biological activities of the aldehyde and alcohol of gibberellins (GAs) A12 and A14, 3 -OH-GA15, 3 -OH-GA15 wrong lactone (i.e. GA37 wrong lactone) and the four major decomposition products of GA3 (isogibberellic, allogibberic, epiallogibberic and 9(11)-dehydroallogibberic acids) were tested over a wide range of concentrations on 13 plant bioassays in order to ascertain certain of the structural requirements for biological activity. Generally modification of the basic GA-molecule decreased its activity in all assays except for derivatives of GA12 and GA14 (suggesting conversion of these derivatives to more polar, active GAs). Modification of the 3-OH from the usual 3 to 3 configuration markedly reduced activity. Neither the presence of an inverted lactone ring (i.e. 3 -OH-GA15 wrong lactone) nor changes to the lactone ring of GA3 (4 10) to form iso-GA3 (4 2) appreciably reduce activity. Further decomposition of GA3 to allogibberic and 9(11)-dehydroallogibberic acid reduced activity only slightly, but epimerization of allogibberic acid at C-9 essentially eliminated biological activity. |
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