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During etiolated growth of the Arabidopsis hypocotyl, all cells initially grow synchronously at a slow pace and then growth acceleration takes place only in cells located at the base of the hypocotyl. Although several growth-regulatory key players have been identified, the regulation of hypocotyl elongation remains elusive. Zdanio et al. (on pp. 1192–1204) have identified EXTENSIN33, an ER and cell wall-localised protein that controls the rate and extent at which hypocotyls grow in the dark by modifying cell wall extensibility.
The cover image shows a confocal image of a 2-day-old dark-grown promotor-EXT33::GFP expressing Arabidopsis hypocotyl, with highest GFP/EXT33 expression at the base of the hypocotyl where cell expansion rate is highest at the moment of imaging. Red colour denotes cell walls stained by propidium iodide, green denotes prom EXT33-driven GFP expression. Image supplied by Malgorzata Zdanio (University of Antwerp, Belgium).
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