About the Cover
On the Cover: Plant physiology is powered by growth. Cells grow in different directions and rates according to their position within an organ; however, how plants modify growth rates within an organ is mostly unknown. A prerequisite for progress is being able to measure the spatial distribution of growth accurately and conveniently. In this issue, van der Weele et al. (pp. 1138-1148) present new software, RootflowRT, that uses digital image processing techniques to calculate automatically the velocity of motion in two dimensions at each pixel of an image. The cover illustrates the spatial pattern of velocity within a portion of the Arabidopsis root, with high velocity in red and low velocity in blue. The software produces highly resolved spatiotemporal velocity fields, without requiring the root to be marked, and has already produced data that suggest our view of growth within the root needs revision.
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Copyright © 2007 by the American Society of Plant Biologists
