Abstract
Enlarging plant factory increases the risk of inhomogeneous distribution and fluctuation in temperature. This is why a research about quantification of the effect of temperature fluctuation is required focusing on high temperature-sensitivity of plant. In this study we quantified temperature-sensitivity of lettuce in the germination using synchronization index of circadian rhythms as an index. We used transgenic Greenwave lettuce (AtCCA1 :LUC) and analyzed the synchronization rate of circadian rhythms among individuals by measuring circadian rhythm of the lettuce in germination. It was revealed that circadian rhythms synchronized among individuals by temperature changes with diurnal fluctuation and rapidly decreasing. These results indicate that plant circadian clock has high temperature-sensitivity. Therefore plant factory is required accurate temperature control when we perform monitoring and selection of seedling based on measurement of circadian clock.
