Spatial Regulation of the Gene Expression Response to Shade in Arabidopsis Seedlings.

The shade avoidance response, which allows plants to escape from nearby competitors, is triggered by a reduction in the PFR form of phytochrome in response to shade. Classic physiological experiments have demonstrated that the shade signal perceived by the leaves is transmitted to the other parts of the plant. Recently, a simple method was developed to analyze the transcriptome in a single microgram tissue sample.