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ISHS Acta Horticulturae 515: XXV International Horticultural Congress, Part 5: Culture Techniques with Special Emphasis on Environmental Implications Chemical, Physical and Biological Means of Regulating Crop Growth in Ornamentals and Other Crops

THE INFLUENCE OF TEMPERATURE ON THE GERMINATION OF SEED OF A COMMERCIAL VERBENA HYBRID

Authors:   P.J. Jansen van Vuuren, A.C. Lubbe
Keywords:   Verbena x hybrida, germination percentage, cardinal temperature
Abstract:
The influence of temperature on Verbena. x hybrida Voss seed germination was evaluated, in terms of current germination recommendations to overcome erratic and low germination. During three experiments, non-dormant seeds were exposed to continuous constant temperatures and alternating diurnal temperatures. Seeds were germinated on germination paper inside clear petri dishes, using dark temperature-controlled incubators.

No germination occurred at constant 10°C. Significantly (P≤0,05) reduced germination occurred at constant 15°C and at irregular fluctuating temperatures, while 25°C was assumed as a cardinal constant temperature. Controlled fluctuations did not significantly reduce germination.

V. x hybrida seed should be germinated at any alternating diurnal temperature regime with a constant amplitude, between 28°C day and 14°C night temperatures.

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