ISHS Acta Horticulturae 378: Workshop on Environmental Regulation of Plant Morphogenesis
THE ROLE OF GIBBERELLINS IN THE CONTROL OF INFLORESCENCE BUD INITIATION OF RHODODENDRON SIMSII |
| Authors: | M. BODSON, E. THOMAS |
| Keywords: | shoot growth, internode elongation, GA1, GA3, GA4, paclobutrazol, cimectacarb-ethyl, growth retardants |
| Abstract:
Three different GAs (GA1, GA3 and GA4) and two growth retardants (paclobutrazol and cimectacarb-ethyl) were applied directly on the apical buds of Rh. simsii grown in 16-h days. All 3 GAs stimulated shoot growth and inhibit the inflorescence bud initiation. At similar concentrations, they act differently : GA1 promotes leaf initiation to a small extent, while GA3 and GA4 stimulate both leaf initiation and internode elongation. The inhibition of the inflorescence bud initiation is directly related to the promotive effect of GAs on shoot growth. Paclobutrazol reduces leaf initiation and internode elongation, but promotes inflorescence initiation. Cimectacarb-ethyl inhibits both internode elongation and inflorescence initiation. The possible role of specific GAs in the control of the shoot development of Rh. simsii will be discussed. | |
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