Testing the Münch hypothesis of long distance phloem transport in plants

Michael Knoblauch, Jan Knoblauch, Daniel L. Mullendore, Jessica A. Savage, Benjamin A. Babst, Sierra D. Beecher, Adam C. Dodgen, Kaare Hartvig Jensen, N. Michele Holbrook

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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.
Original languageEnglish
JournaleLife
Volume5
ISSN2050-084X
DOIs
Publication statusPublished - 2016

Bibliographical note

This article is distributed under the terms of the Creative Commons Attribution License

Keywords

  • Münch
  • Long distance transport
  • Morning glory
  • Phloem
  • Plant biology
  • Pressure flow hypothesis
  • Sieve element

Cite this

Knoblauch, M., Knoblauch, J., Mullendore, D. L., Savage, J. A., Babst, B. A., Beecher, S. D., ... Holbrook, N. M. (2016). Testing the Münch hypothesis of long distance phloem transport in plants. eLife, 5. https://doi.org/10.7554/eLife.15341
Knoblauch, Michael ; Knoblauch, Jan ; Mullendore, Daniel L. ; Savage, Jessica A. ; Babst, Benjamin A. ; Beecher, Sierra D. ; Dodgen, Adam C. ; Jensen, Kaare Hartvig ; Holbrook, N. Michele. / Testing the Münch hypothesis of long distance phloem transport in plants. In: eLife. 2016 ; Vol. 5.
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abstract = "Long distance transport in plants occurs in sieve tubes of the phloem. The pressure flow hypothesis introduced by Ernst M{\"u}nch 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 M{\"u}nch hypothesis, while providing new tools for the investigation of one of the least understood plant tissues.",
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author = "Michael Knoblauch and Jan Knoblauch and Mullendore, {Daniel L.} and Savage, {Jessica A.} and Babst, {Benjamin A.} and Beecher, {Sierra D.} and Dodgen, {Adam C.} and Jensen, {Kaare Hartvig} and Holbrook, {N. Michele}",
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Knoblauch, M, Knoblauch, J, Mullendore, DL, Savage, JA, Babst, BA, Beecher, SD, Dodgen, AC, Jensen, KH & Holbrook, NM 2016, 'Testing the Münch hypothesis of long distance phloem transport in plants', eLife, vol. 5. https://doi.org/10.7554/eLife.15341

Testing the Münch hypothesis of long distance phloem transport in plants. / Knoblauch, Michael; Knoblauch, Jan; Mullendore, Daniel L.; Savage, Jessica A.; Babst, Benjamin A.; Beecher, Sierra D.; Dodgen, Adam C.; Jensen, Kaare Hartvig; Holbrook, N. Michele.

In: eLife, Vol. 5, 2016.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Testing the Münch hypothesis of long distance phloem transport in plants

AU - Knoblauch, Michael

AU - Knoblauch, Jan

AU - Mullendore, Daniel L.

AU - Savage, Jessica A.

AU - Babst, Benjamin A.

AU - Beecher, Sierra D.

AU - Dodgen, Adam C.

AU - Jensen, Kaare Hartvig

AU - Holbrook, N. Michele

N1 - This article is distributed under the terms of the Creative Commons Attribution License

PY - 2016

Y1 - 2016

N2 - 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.

AB - 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.

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KW - Long distance transport

KW - Morning glory

KW - Phloem

KW - Plant biology

KW - Pressure flow hypothesis

KW - Sieve element

U2 - 10.7554/eLife.15341

DO - 10.7554/eLife.15341

M3 - Journal article

VL - 5

JO - eLife

JF - eLife

SN - 2050-084X

ER -

Knoblauch M, Knoblauch J, Mullendore DL, Savage JA, Babst BA, Beecher SD et al. Testing the Münch hypothesis of long distance phloem transport in plants. eLife. 2016;5. https://doi.org/10.7554/eLife.15341