title: Quantitative imaging of directional transport through plasmodesmata in moss protonemata via single-cell photoconversion of Dendra2.
abstract: Cell-to-cell transport of molecules in plants must be properly regulated for plant growth and development. One specialized mechanism that plants have evolved involves transport through plasmodesmata (PD), but when and how transport of molecules via PD is regulated among individual cells remains largely unknown, particularly at the single-cell level. Here, we developed a tool for quantitatively analyzing cell-to-cell transport via PD at a single-cell level using protonemata of Physcomitrella patens and a photoconvertible fluorescent protein, Dendra2. In the filamentous protonemal tissues, one-dimensional intercellular communication can be observed easily. Using this system, we found that Dendra2 was directionally transported toward the apex of the growing protonemata. However, this directional transport could be eliminated by incubation in the dark or treatment with a metabolic inhibitor. Thus, we propose that directional transport of macromolecules can occur via PD in moss protonemata, and may be affected by the photosynthetic and metabolic activity of cells.
authors: Graduate School of Life Science, Hokkaido University, Kita 10 Nishi 8, Kita-ku, Sapporo, 060-0810, Japan. m.kitagawa@mail.sci.hokudai.ac.jp
authors: Munenori
authors: M
authors: Kitagawa
authors: Tomomichi
authors: T
authors: Fujita
mesh_terms: D001692:Biological Transport; D019068:Bryopsida / Q000235:genetics / Q000378:metabolism* / Q000648:ultrastructure; D002450:Cell Communication; D015870:Gene Expression; D008164:Luminescent Proteins / Q000235:genetics / Q000378:metabolism; D059828:Plant Cells / Q000378:metabolism / Q000648:ultrastructure; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism*; D031425:Plasmodesmata / Q000378:metabolism* / Q000648:ultrastructure; D059008:Time-Lapse Imaging
chemical_list: D008164:Luminescent Proteins; D010940:Plant Proteins
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