文章基本信息

标题：Positioning the Root Elongation Zone Is Saltatory and Receives Input from the Shoot
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作者：Tobias I. Baskin ; Simon Preston ; Ellen Zelinsky 等
期刊名称：iScience
印刷版ISSN：2589-0042
出版年度：2020
卷号：23
期号：7
页码：1-47
DOI：10.1016/j.isci.2020.101309
语种：English
出版社：Elsevier
摘要：SummaryIn the root, meristem and elongation zone lengths remain stable, despite growth and division of cells. To gain insight into zone stability, we imaged individualArabidopsis thalianaroots through a horizontal microscope and used image analysis to obtain velocity profiles. For a root, velocity profiles obtained every 5 min over 3 h coincided closely, implying that zonation is regulated tightly. However, the position of the elongation zone saltated, by on average 17 μm every 5 min. Saltation was apparently driven by material elements growing faster and then slower, while moving through the growth zone. When the shoot was excised, after about 90 min, growth zone dynamics resembled those of intact roots, except that the position of the elongation zone moved, on average, rootward, by several hundred microns in 24 h. We hypothesize that mechanisms determining elongation zone position receive input from the shoot.Graphical AbstractDisplay OmittedHighlights•ForArabidopsisthalianaroots, the distribution of elongation is stable over several hours•The position of the elongation zone saltates (moving ±17 μm on average over 5 min)•After shoot excision, saltation continues with a net movement toward the tip•The elongation zone may be sited by a feedback mechanism, with input from the shootBiological Sciences; Plant Biology; Plant Development