Abstract
Water channel proteins, termed aquaporin, belong membrane proteins and involved water movement across membrane. We have previously reported that plant's stem conducts light toward root. In addition, we confirmed that several aquaporin gene expression levels in Arabidopsis root were altered by far-red light irradiation. These observations suggest axial light conduction might modulate water transport activity through regulation of aquaporin level in root. To elucidate whether water transport activity was controlled by light, we monitored water dynamics in Arabidopsis root under light-dark cycles using 1H-NMR imaging. Under light condition, water content in root was decreased compare to that in dark. Moreover, autonomous rhythm of water dynamics were observed under continuous light and dark conditions, suggesting both light signal and circadian clock might modulate water transport in root. Here, we will present about correlation between aquaporin gene expression level and water transport activity in root under light-dark cycles.
