ISHS Acta Horticulturae 514: XXV International Horticultural Congress, Part 4: Culture Techniques with Special Emphasis on Environmental Implications
EFFECT OF DAY AND NIGHT TEMPERATURE VARIATION AND OF HIGH TEMPERATURE ON DEVERNALIZATION IN RADISH |
| Author: | S. Tzay-Fa |
| Keywords: | devernalization, radish, temperature |
| Abstract:
Ta-Mei-Fua radish must be exposed to a temperature of 5? for a period of 20 days to achieve complete vernalization. Exposure to 5? for only 10 days resulted in incomplete vernalization. When temperatures varied from day to night during vernalization, the higher daytime temperature erased the vernalizing effect of low night temperature. It was shown that devernalization occurred during the higher daytime temperature of 20 or 30.3? eliminated the sugar formed during the cooler nights. After an uninterrupted period of vernalization, neither subsequent high temperature nor alternating high day/low night temperature could reverse the complete vernalization. It was also shown that a completely vernalized plant maintains a stable high sugar content which neither high temperature nor day /night temperature variation could reduce. Thus, a high sugar level in vernalized plants might account for the hastening of flower initiation and development. | |
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