title: Vascular-mediated signalling involved in early phosphate stress response in plants.
abstract: Depletion of finite global rock phosphate (Pi) reserves will impose major limitations on future agricultural productivity and food security. Hence, modern breeding programmes seek to develop Pi-efficient crops with sustainable yields under reduced Pi fertilizer inputs. In this regard, although the long-term responses of plants to Pi stress are well documented, the early signalling events have yet to be elucidated. Here, we show plant tissue-specific responses to early Pi stress at the transcription level and a predominant role of the plant vascular system in this process. Specifically, imposition of Pi stress induces rapid and major changes in the mRNA population in the phloem translocation stream, and grafting studies have revealed that many hundreds of phloem-mobile mRNAs are delivered to specific sink tissues. We propose that the shoot vascular system acts as the site of root-derived Pi stress perception, and the phloem serves to deliver a cascade of signals to various sinks, presumably to coordinate whole-plant Pi homeostasis.
authors.affiliation: Department of Plant Biology, College of Biological Sciences, University of California, Davis, California, USA.
authors.forename: Zhaoliang
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: Boyce Thompson Institute for Plant Research, Cornell University, Ithaca, New York, USA.
authors.forename: Yi
authors.initials: Y
authors.lastname: Zheng
authors.affiliation: Department of Plant Biology, College of Biological Sciences, University of California, Davis, California, USA.
authors.forename: Byung-Kook
authors.initials: BK
authors.lastname: Ham
authors.affiliation: Department of Plant Biology, College of Biological Sciences, University of California, Davis, California, USA.
authors.forename: Jieyu
authors.initials: J
authors.lastname: Chen
authors.affiliation: Department of Plant Biology, College of Biological Sciences, University of California, Davis, California, USA.|Department of Agricultural and Environmental Biology, Graduate School of Agricultural and Life Sciences, University of Tokyo, Bunkyo-ku, Tokyo, Japan.
authors.forename: Akiko
authors.initials: A
authors.lastname: Yoshida
authors.affiliation: USDA-ARS Robert W. Holley Center for Agriculture and Health, Cornell University, Ithaca, New York, USA.
authors.forename: Leon V
authors.identifier: 0000-0003-3416-089X
authors.initials: LV
authors.lastname: Kochian
authors.affiliation: Boyce Thompson Institute for Plant Research, Cornell University, Ithaca, New York, USA.
authors.forename: Zhangjun
authors.initials: Z
authors.lastname: Fei
authors.affiliation: Department of Plant Biology, College of Biological Sciences, University of California, Davis, California, USA.
authors.forename: William J
authors.initials: WJ
authors.lastname: Lucas
mesh_terms: D029773:Citrullus / Q000235:genetics* / Q000378:metabolism; D028462:Cucumis / Q000235:genetics* / Q000378:metabolism; D018506:Gene Expression Regulation, Plant; D010710:Phosphates / Q000378:metabolism*; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism; D015398:Signal Transduction; D013312:Stress, Physiological
chemical_list: D010710:Phosphates; D010940:Plant Proteins