title: Is the leaf bundle sheath a "smart flux valve" for K+ nutrition?
abstract: Evidence has started to accumulate that the bundle sheath regulates the passage of water, minerals and metabolites between the mesophyll and the conducting vessels of xylem and phloem within the leaf veins which it envelops. Although potassium (K(+)) nutrition has been studied for several decades, and much is known about the uptake and recirculation of K(+) within the plant, the potential regulatory role of bundle sheath with regard to K(+) fluxes has just begun to be addressed. Here we have collected some facts and ideas about these processes.
authors.affiliation: The R.H. Smith Institute of Plant Sciences and Genetics in Agriculture, The R.H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 76100, Israel.
authors.forename: Noa
authors.initials: N
authors.lastname: Wigoda
authors.affiliation: The R.H. Smith Institute of Plant Sciences and Genetics in Agriculture, The R.H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 76100, Israel.
authors.forename: Menachem
authors.initials: M
authors.lastname: Moshelion
authors.affiliation: The R.H. Smith Institute of Plant Sciences and Genetics in Agriculture, The R.H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 76100, Israel. Electronic address: nava.moran@huji.ac.il.
authors.forename: Nava
authors.initials: N
authors.lastname: Moran
mesh_terms: D001692:Biological Transport; D008954:Models, Biological; D052585:Phloem / Q000166:cytology / Q000378:metabolism; D018515:Plant Leaves / Q000166:cytology / Q000378:metabolism; D010940:Plant Proteins / Q000378:metabolism; D010944:Plants / Q000378:metabolism*; D031425:Plasmodesmata / Q000378:metabolism; D011188:Potassium / Q000378:metabolism*; D015221:Potassium Channels / Q000378:metabolism*; D014867:Water / Q000378:metabolism; D052584:Xylem / Q000166:cytology / Q000378:metabolism
chemical_list: D010940:Plant Proteins; D015221:Potassium Channels; D014867:Water; D011188:Potassium
keywords: Apoplasmic; Barrier; Bundle sheath; Plasmodesmata; Potassium transporter