Roles of Morphology, Anatomy, and Aquaporins in Determining Contrasting Hydraulic Behavior of Roots

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dc.contributor.authorBramley, H.
dc.contributor.authorTurner, N.
dc.contributor.authorTurner, D.
dc.contributor.authorTyerman, S.
dc.date.issued2009
dc.description.abstractThe contrasting hydraulic properties of wheat (Triticum aestivum), narrow-leafed lupin (Lupinus angustifolius), and yellow lupin (Lupinus luteus) roots were identified by integrating measurements of water flow across different structural levels of organization with anatomy and modeling. Anatomy played a major role in root hydraulics, influencing axial conductance (L(ax)) and the distribution of water uptake along the root, with a more localized role for aquaporins (AQPs). Lupin roots had greater L(ax) than wheat roots, due to greater xylem development. L(ax) and root hydraulic conductance (L(r)) were related to each other, such that both variables increased with distance from the root tip in lupin roots. L(ax) and L(r) were constant with distance from the tip in wheat roots. Despite these contrasting behaviors, the hydraulic conductivity of root cells (Lp(c)) was similar for all species and increased from the root surface toward the endodermis. Lp(c) was largely controlled by AQPs, as demonstrated by dramatic reductions in Lp(c) by the AQP blocker mercury. Modeling the root as a series of concentric, cylindrical membranes, and the inhibition of AQP activity at the root level, indicated that water flow in lupin roots occurred primarily through the apoplast, without crossing membranes and without the involvement of AQPs. In contrast, water flow across wheat roots crossed mercury-sensitive AQPs in the endodermis, which significantly influenced L(r). This study demonstrates the importance of examining root morphology and anatomy in assessing the role of AQPs in root hydraulics.
dc.description.statementofresponsibilityHelen Bramley, Neil C. Turner, David W. Turner, and Stephen D. Tyerman
dc.identifier.citationPlant Physiology, 2009; 150(1):348-364
dc.identifier.doi10.1104/pp.108.134098
dc.identifier.issn0032-0889
dc.identifier.issn1532-2548
dc.identifier.orcidTyerman, S. [0000-0003-2455-1643]
dc.identifier.urihttp://hdl.handle.net/2440/51461
dc.language.isoen
dc.publisherAmer Soc Plant Physiologists
dc.relation.grantARC
dc.source.urihttps://doi.org/10.1104/pp.108.134098
dc.subjectLupinus
dc.subjectTriticum
dc.subjectPlant Roots
dc.subjectMercury
dc.subjectWater
dc.subjectAquaporins
dc.subjectBiological Transport
dc.subjectXylem
dc.titleRoles of Morphology, Anatomy, and Aquaporins in Determining Contrasting Hydraulic Behavior of Roots
dc.typeJournal article
pubs.publication-statusPublished

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