Testing the Münch hypothesis of long distance phloem transport in plants
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.
- Authors:
-
[1];
- School of Biological Sciences, Washington State University, Pullman, United States
- School of Biological Sciences, Washington State University, Pullman, United States, Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, United States
- Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, United States, Arnold Arboretum of Harvard University, Boston, United States
- Department of Biosciences, Brookhaven National Laboratory, Upton, New York
- Department of Physics, Technical University of Denmark, Lyngby, Denmark
- Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, United States
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER)
- OSTI Identifier:
- 1261693
- Alternate Identifier(s):
- OSTI ID: 1261694; OSTI ID: 1628853
- Grant/Contract Number:
- AC02-98CH10886
- Resource Type:
- Published Article
- Journal Name:
- eLife
- Additional Journal Information:
- Journal Name: eLife Journal Volume: 5; Journal ID: ISSN 2050-084X
- Publisher:
- eLife Sciences Publications, Ltd.
- Country of Publication:
- United States
- Language:
- English
- Subject:
- Life Sciences & Biomedicine - Other Topics
Citation Formats
Knoblauch, Michael, Knoblauch, Jan, Mullendore, Daniel L., Savage, Jessica A., Babst, Benjamin A., Beecher, Sierra D., Dodgen, Adam C., Jensen, Kaare H., and Holbrook, N. Michele. Testing the Münch hypothesis of long distance phloem transport in plants. United States: N. p., 2016.
Web. doi: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 H., & Holbrook, N. Michele. Testing the Münch hypothesis of long distance phloem transport in plants. United States. 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 H., and Holbrook, N. Michele. Thu .
"Testing the Münch hypothesis of long distance phloem transport in plants". United States. https://doi.org/10.7554/eLife.15341.
@article{osti_1261693,
title = {Testing the Münch hypothesis of long distance phloem transport in plants},
author = {Knoblauch, Michael and Knoblauch, Jan and Mullendore, Daniel L. and Savage, Jessica A. and Babst, Benjamin A. and Beecher, Sierra D. and Dodgen, Adam C. and Jensen, Kaare H. and Holbrook, N. Michele},
abstractNote = {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.},
doi = {10.7554/eLife.15341},
journal = {eLife},
number = ,
volume = 5,
place = {United States},
year = {Thu Jun 02 00:00:00 EDT 2016},
month = {Thu Jun 02 00:00:00 EDT 2016}
}
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https://doi.org/10.7554/eLife.15341
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