Use of a duckweed species, , for whole-plant observation of physiological behavior at the single-cell level.

We developed a new model system to analyze physiological behavior at the single-cell level in whole plants. is a species of rootless duckweed, which has a thin and very small structure and can grow rapidly on the surface of culture medium. Epidermal and mesophyll cells were transfected with a reporter gene using particle bombardment and were observed at the single-cell level in the whole living plant. An EM-CCD camera system with a macro zoom microscope was used to capture time-lapse images of bioluminescence, and we successfully detected circadian rhythms in individual cells that expressed a luciferase gene under the control of a circadian promoter. We also detected individual -phase cells in meristematic tissues of intact plants by using a 5-ethynyl-2'-deoxyuridine (EdU)-labeling assay. Our observations indicated that low-molecular-weight compounds could access the inside of the plant body. Thus, showed the experimental characteristics suitable for single-cell analyses that could be combined with whole-plant observations and/or pharmacological analyses/chemical biology.