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Luciferase is the ideal reporter gene to provide temporal and spatial information on promoter activity in
Arabidopsis
and other eukaryotes; the noninvasive detection of luminescence and short half-life of luciferase activity allow repeated measurements of individual seedlings over several days to assay dynamic changes in gene expression. Transgenic or transiently transformed plants with a luciferase gene under the control of a promoter of interest are required. Detection of the low level of luminescence produced by the luciferase gene in
Arabidopsis
requires the use of low light detecting charge-coupled device (CCD) cameras or scintillation counters. This chapter contains protocols on assaying and imaging luciferase in vivo and the automation for high-resolution timecourses.