Testing the Münch hypothesis of long distance phloem transport in plants

Author:

Knoblauch Michael1ORCID,Knoblauch Jan12,Mullendore Daniel L1,Savage Jessica A23,Babst Benjamin A4,Beecher Sierra D1,Dodgen Adam C1,Jensen Kaare H5,Holbrook N Michele2

Affiliation:

1. School of Biological Sciences, Washington State University, Pullman, United States

2. Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, United States

3. Arnold Arboretum of Harvard University, Boston, United States

4. Department of Biosciences, Brookhaven National Laboratory, Upton, New York

5. Department of Physics, Technical University of Denmark, Lyngby, Denmark

Abstract

Long distance transport in plants occurs in sieve tubes of the phloem. The pressure flow hypothesis introduced by Ernst Münch in 1930 describes a mechanism of osmotically generated pressure differentials that are supposed to drive the movement of sugars and other solutes in the phloem, but this hypothesis has long faced major challenges. The key issue is whether the conductance of sieve tubes, including sieve plate pores, is sufficient to allow pressure flow. We show that with increasing distance between source and sink, sieve tube conductivity and turgor increases dramatically in Ipomoea nil. Our results provide strong support for the Münch hypothesis, while providing new tools for the investigation of one of the least understood plant tissues.

Funder

Harvard Bullard Fellowship

National Science Foundation

U.S. Department of Energy

Carlsbergfondet

Publisher

eLife Sciences Publications, Ltd

Subject

General Immunology and Microbiology,General Biochemistry, Genetics and Molecular Biology,General Medicine,General Neuroscience

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