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Plants respond to a wide range of intrinsic signals that regulate their growth and development. These include sugars, RNAs, polypeptides, phytohormones and peptide hormones, which are thought to act as long-range mobile signals that travel via either the phloem or xylem to help co-ordinate whole-plant responses. This month’s Spotlight Issue, organised by Hitoshi Sakakibara and Yoshikatsu Matsubayashi, which includes a meeting report and a selection of review papers from contributors of the recent Integrative Graduate Education and Research Program in Green Natural Sciences (IGER) International Symposium on Long-Distance Signaling in Plants (see Kiba, on pp. 1697–1699), presents an overview of current research in this field.
The cover shows a confocal laser scanning microscopy image of Fluorescein diacetate (greenfluorescence) loaded into petioles of N. tabacum and transported via the stem vasculature (recorded by Friedrich Kragler and Wenna Zhang, Max Planck Institute of Molecular Plant Physiology, Potsdam, Germany) to dissect the unloading pattern of phloem-transported molecules in leaves and flowers (as reported in Zhangetal.2014). Plastid and vascular cell wall auto-fluorescence is shown in red and blue, respectively.
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