ISHS Acta Horticulturae 378: Workshop on Environmental Regulation of Plant Morphogenesis
GROWTH OF YOUNG DENDRANTHEMA PLANTS IN RELATION TO CONSTANT AND DIFFERENTIAL AIR AND ROOT TEMPERATURE |
| Authors: | P. Karlsen, L. Bertram |
| Keywords: | DIF, Elongation, Root-DIF |
| Abstract:
The purpose of the present investigation was to examine if a negative root-DIF could have a similar effect on stem elongation as an aerial DIF. Rooted cuttings of Dendranthema morifolia Ramat. cv ‘Coral Charm’ were used as experimental plants. Within two aerial temperature treatments, constant day/night and negative DIF, the plants were grown in water culture systems with differential or constant root temperatures. When root temperature was constant an aerial negative DIF -6°C reduced stem elongation by 40%. Negative root-DIF did not significantly affect elongation when the plants were exposed to aerial negative DIF. When air temperature was constant, a negative root-DIF of -3°C reduced elongation between 8 and 13%. | |
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