INTERACTION BETWEEN GROWTH REGULATORS AND PHOTOPERIOD IN THE CONTROL OF THE REPRODUCTIVE DEVELOPMENT OF RHODONDENDRON SIMSH

Foliar applications of paclobutrazol promote inflorescence bud initiation, while GA treatments release inflorescence bud dormancy and promote the further development to anthesis.
GA₃ is more efficient than GA₄₊₇.

The promotional effect of paclobutrazol is larger for plants grown in 16-h LD than in shorter photoperiods while the promotional effect of GA₃ is larger for plants grown in 12-h days or when plants grown in 16-h days have been previously treated with paclobutrazol.
The possible role of GAs in the control of the reproductive development of Rh. simsii is discussed.

First European Workshop on Thermogenesis and Photomorphogenesis in the Cultivation of Ornamentals

M. Bodson

paclobutrazol, GA₃, GA₄₊₇, flower initiation, inflorescence bud dormancy

https://doi.org/10.17660/ActaHortic.1992.305.13