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Transport in a coordinated soil-root-xylem-phloem leaf system

dc.contributor.author Domec, Jean
dc.contributor.author Palmroth, Sari
dc.contributor.author Katul, Gabriel
dc.contributor.author Huang, Cheng-Wei
dc.contributor.author Pockman, William T
dc.contributor.author Litvak, Marcy E
dc.date.accessioned 2018-08-13T12:55:04Z
dc.date.available 2018-08-13T12:55:04Z
dc.date.issued 2018-09
dc.identifier.issn 0309-1708
dc.identifier.uri https://hdl.handle.net/10161/17324
dc.description.abstract © 2018 Elsevier Ltd Links between the carbon and water economies of plants are coupled by combining the biochemical demand for atmospheric CO2with gas transfer through stomates, liquid water transport in the soil-xylem hydraulic system and sucrose export in the phloem. We formulated a model to predict stomatal conductance (gs), consistent with the maximum energy circulation concept of Lotka and Odum, by maximizing the sucrose flux out of photosynthesizing leaves. The proposed modeling approach recovers all prior results derived from stomatal optimization theories and profit-maximization arguments for the xylem hydraulic system aimed at predicting gs. The novel features of this approach are its ability to 1) predict the price of losing water in carbon units using xylem and phloem properties (i.e., the marginal water use efficiency) and 2) explain why water molecules become more expensive to exchange for CO2molecules when soil moisture becomes limiting or when plants acclimate to new elevated atmospheric CO2concentration. On short time-scales (sub-daily), predicted gsunder many environmental stimuli were consistent with measurements reported in the literature, including a general sensitivity of gsto vapor pressure deficit and leaf water potential. During progressive droughts, differences in the coordination among the leaf, xylem, and phloem functioning determine the isohydric-to-anisohydric behavior among plants.
dc.relation.ispartof Advances in Water Resources
dc.relation.isversionof 10.1016/j.advwatres.2018.06.002
dc.title Transport in a coordinated soil-root-xylem-phloem leaf system
dc.type Journal article
dc.date.updated 2018-08-13T12:55:02Z
pubs.begin-page 1
pubs.end-page 16
pubs.organisational-group Nicholas School of the Environment
pubs.organisational-group Duke
pubs.organisational-group Environmental Sciences and Policy
pubs.publication-status Accepted
pubs.volume 119
duke.contributor.orcid Katul, Gabriel|0000-0001-9768-3693


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