Articles
ROOT TEMPERATURE AND STEM ELONGATION
Article number
435_2
Pages
33 – 46
Language
Abstract
An experiment was carried out under greenhouse conditions to examine the effects of differential root temperatures on stem elongation.
Young Dendranthema plants were exposed to root temperatures of Day / Night: 25/15°C or 15/25°C. It was found that both treatments reduced the final stem length compared to plants grown at a constant root temperature of 20°C. When root temperature was changed in the morning, the pressure potential in the upper part of the stem decreased by 22 – 34% compared with plants grown at a constant root temperature.
Young Dendranthema plants were exposed to root temperatures of Day / Night: 25/15°C or 15/25°C. It was found that both treatments reduced the final stem length compared to plants grown at a constant root temperature of 20°C. When root temperature was changed in the morning, the pressure potential in the upper part of the stem decreased by 22 – 34% compared with plants grown at a constant root temperature.
Stem elongation of plants treated with differential root temperatures was measured continuously, using linear voltage differential transducers (LVDT), and stem elongation rate (SER) kinetics were computed and presented on a day and night basis.
The changes in the SER pattern due to changes in root temperature and their possible causes, are discussed.
Authors
P. Karlsen
Keywords
Cucumis, Dendranthema, differential root temperature, pressure potential
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