Growth and Physiological Responses of Chinese Cabbage ‘Chungwang' to Different Temperatures during Early to Middle Growth Stages

Changes of the growth patterns of Chinese cabbage (cv ‘Chungwang’) in response to six different temperature treatments were investigated during the early to middle stages of growth. The temperature treatments consisted of 14/9°C (day/night; group I), 17/12°C (group II), 20/15°C (group III), 23/18°C (group IV), 26/21°C (group V), and 29/24°C (group VI) using the soil plant atmosphere research system. Fresh weight was the highest in group III as 1658.3g, and it was decreased in group IV (1458.3g), group I (1340.7g), group II (1243.0g), group V (1240.3g), and group VI (1172.7g). However, dry weight was relatively decreased in low temperature treatment groups. Leaf number and area were the higher in group V and  VI during the early growth stage, but it was relatively increase in group III, and IV after 28 days from planting. Regarding photosynthetic rate and transpiration at the 28 days from planting, photosynthetic rate was the highest in the group IV, and it was relatively decreased in high temperature groups (group V and VI). On the contrary, transpiration was observed a relatively high value in group V and VI, and it was lower in the groups treated with low temperature.