Abstract
The effects of day temperature, night temperature, and the difference between day and night temperatures on coloring of flowering cabbage ‘Winter cherry’ and ‘Haresugata’ were investigated under illumination with blue, green, and yellow rich type white fluorescent lamps. In the experiment which investigated the night temperature, the leaves changed color at 20/5°C (day/night) and 20/10°C until 20 days after temperature treatment started, but it did not change at 20/15°C. In the experiment which investigated the day temperature, the leaves changed color at 15/5°C and 20/5°C until 20 days after temperature treatment started, but it did not change at 25/5°C. In the experiment with no difference between day and night temperatures, the leaves changed color at 15/0°C and 20/5°C until 20 days after temperature treatment started, but it did not change at 25/10°C. In all experiments, the coloring area rate was the highest at 20/5°C until 20 days after temperature treatment started. These results showed that a day temperature of under 20°C and night temperature of under 10°C were necessary for coloring. Furthermore, it was revealed that coloring of flowering cabbage ‘Winter cherry’ and ‘Haresugata’ was influenced by the day temperature more than the night temperature or difference between the two.
