Interactions of the Growth Retardants Daminozide and Piproctanyl Bromide, and Gibberellins A1, A3, A4+7, A5 and A13 in Stem Extension and Inflorescence Development in Chrysanthemum morifolium Ramat |
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Authors: | MENHENETT R |
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Institution: | Glasshouse Crops Research Institute Worthing Road, Littlehampton, West Sussex BN16 3PU |
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Abstract: | Interactions between the growth retardants daminozide (a substitutedsuccinamic acid) or piproctanyl bromide (a quaternary ammonium,piperidinium compound), and a subsequent application of a singledose (40 µg) of either gibberellin A1, A3, A4+7 or A12,showed that, in Chrysanthemum morifolium Ramat. cv. Bright GoldenAnne, a strong interdependence exists between elongation ofthe lateral shoot and the rate of development of its terminalinflorescence. A1, A3, and A4+7 were highly active in overcoming the restrictionson both internode extension and the rate of flower-bud developmentimposed by either retardant, suggesting that these two retardanteffects are caused by a deficiency of active gibberellins (GN).In the absence of retardant, A1, A3, and A4+7 markedly increasedstem elongation, and flowering occurred earlier than in plantsreceiving neither retardant nor GN. A13 the only 20-carbon GNtested, was much less active, while A5 had a relatively greatereffect on the time of flowering than on shoot elongation. Thus,it is not necessarily the rate of stem extension which determinesthe rate of inflorescence development. The response to different amounts of A1, A3 or A13 (1, 5, 10,20, or 50 µg per shoot) neither suggest that differentthreshold levels of a particular GN are requiredto induce increases in either stem elongation or in the rateat which inflorescences develop, nor did a change in the dosegiven lead to any consistent differential effect on these twoprocesses. Chrysanthemum morifolium Ramat., stem extension, inflorescence development, growth retardants, gibberellins |
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