Show simple item record

dc.contributor.author
Carminati, Andrea
dc.date.accessioned
2021-05-06T06:52:56Z
dc.date.available
2021-05-04T20:28:48Z
dc.date.available
2021-05-06T06:52:56Z
dc.date.issued
2013-08-13
dc.identifier.issn
1664-462X
dc.identifier.other
10.3389/fpls.2013.00298
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/482453
dc.identifier.doi
10.3929/ethz-b-000482453
dc.description.abstract
As plant roots take up water and the soil dries, water depletion is expected to occur in the vicinity of roots, the so called rhizosphere. However, recent experiments showed that the rhizosphere of lupines was wetter than the bulk soil during the drying period. Surprisingly, the rhizosphere remained temporarily dry after irrigation. Such water dynamics in the rhizosphere can be explained by the drying/wetting dynamics of mucilage exuded by roots. The capacity of mucilage to hold large volumes of water at negative water potential may favor root water uptake. However, mucilage hydrophobicity after drying may temporarily limit the local water uptake after irrigation. The effects of such rhizosphere dynamics are not yet understood. In particular, it is not known how the rhizosphere dynamics vary along roots and as a function of soil water content. My hypothesis was that the rewetting rate of the rhizosphere is primarily function of root age. Neutron radiography was used to monitor how the rhizosphere water dynamics vary along the root systems of lupines during drying/wetting cycles of different duration. The radiographs showed a fast and almost immediate rewetting of the rhizosphere of the distal root segments, in contrast to a slow rewetting of the rhizosphere of the proximal segments. The rewetting rate of the rhizosphere was not function of the water content before irrigation, but it was function of time. It is concluded that rhizosphere hydrophobicity is not uniform along roots, but it covers only the older and proximal root segments, while the young root segments are hydraulically well-connected to the soil. I included these rhizosphere dynamics in a microscopic model of root water uptake. In the model, the relation between water content and water potential in the rhizosphere is not unique and it varies over time, and the rewetting rate of the rhizosphere decreases with time. The rhisosphere variability seems an optimal adaptation strategy to increase the water uptake of young root segments, which possibly reached new available water, and partly disconnect the old root segments from the already depleted soil.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Frontiers Media
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/3.0/
dc.subject
Drying/wetting cycles
en_US
dc.subject
Mucilage
en_US
dc.subject
Neutron radiography
en_US
dc.subject
Rhizosphere
en_US
dc.subject
Root water uptake
en_US
dc.title
Rhizosphere wettability decreases with root age: A problem or a strategy to increase water uptake of young roots?
en_US
dc.type
Journal Article
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 3.0 Unported
ethz.journal.title
Frontiers in Plant Science
ethz.journal.volume
4
en_US
ethz.journal.issue
1
en_US
ethz.journal.abbreviated
Front. Plant Sci.
ethz.pages.start
298
en_US
ethz.size
9 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.scopus
ethz.publication.place
Lausanne
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02722 - Institut für Terrestrische Oekosysteme / Institute of Terrestrial Ecosystems::09732 - Carminati, Andrea / Carminati, Andrea
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02722 - Institut für Terrestrische Oekosysteme / Institute of Terrestrial Ecosystems::09732 - Carminati, Andrea / Carminati, Andrea
en_US
ethz.identifier.orcidWorkCode
88006287
ethz.date.deposited
2021-05-04T20:29:08Z
ethz.source
FORM
ethz.eth
no
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2021-05-06T06:53:07Z
ethz.rosetta.lastUpdated
2021-05-06T06:53:07Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.atitle=Rhizosphere%20wettability%20decreases%20with%20root%20age:%20A%20problem%20or%20a%20strategy%20to%20increase%20water%20uptake%20of%20young%20roots?&rft.jtitle=Frontiers%20in%20Plant%20Science&rft.date=2013-08-13&rft.volume=4&rft.issue=1&rft.spage=298&rft.issn=1664-462X&rft.au=Carminati,%20Andrea&rft.genre=article&article&rft_id=info:doi/10.3389/fpls.2013.00298&
 Search print copy at ETH Library

Files in this item

Thumbnail

Publication type

Show simple item record