The importance of cuticular permeance in assessing plant water–use strategies

dc.contributor.authorLanning, Matthew
dc.contributor.authorWang, Lixin
dc.contributor.authorNovick, Kimberly A.
dc.contributor.departmentEarth Sciences, School of Scienceen_US
dc.date.accessioned2021-02-05T18:41:13Z
dc.date.available2021-02-05T18:41:13Z
dc.date.issued2020-04
dc.description.abstractAccurate understanding of plant responses to water stress is increasingly important for quantification of ecosystem carbon and water cycling under future climates. Plant water-use strategies can be characterized across a spectrum of water stress responses, from tight stomatal control (isohydric) to distinctly less stomatal control (anisohydric). A recent and popular classification method of plant water-use strategies utilizes the regression slope of predawn and midday leaf water potentials, σ, to reflect the coupling of soil water availability (predawn leaf water potential) and stomatal dynamics (daily decline in leaf water potential). This type of classification is important in predicting ecosystem drought response and resiliency. However, it fails to explain the relative stomatal responses to drought of Acer sacharrum and Quercus alba, improperly ranking them on the spectrum of isohydricity. We argue this inconsistency may be in part due to the cuticular conductance of different species. We used empirical and modeling evidence to show that plants with more permeable cuticles are more often classified as anisohydric; the σ values of those species were very well correlated with measured cuticular permeance. Furthermore, we found that midday leaf water potential in species with more permeable cuticles would continue to decrease as soils become drier, but not in those with less permeable cuticles. We devised a diagnostic parameter, Γ, to identify circumstances where the impact of cuticular conductance could cause species misclassification. The results suggest that cuticular conductance needs to be considered to better understand plant water-use strategies and to accurately predict forest responses to water stress under future climate scenarios.en_US
dc.eprint.versionAuthor's manuscripten_US
dc.identifier.citationLanning, M., Wang, L., & Novick, K. A. (2020). The importance of cuticular permeance in assessing plant water–use strategies. Tree Physiology, 40(4), 425–432. https://doi.org/10.1093/treephys/tpaa020en_US
dc.identifier.urihttps://hdl.handle.net/1805/25153
dc.language.isoenen_US
dc.publisherOxforden_US
dc.relation.isversionof10.1093/treephys/tpaa020en_US
dc.relation.journalTree Physiologyen_US
dc.rightsPublisher Policyen_US
dc.sourceAuthoren_US
dc.subjectcuticleen_US
dc.subjectecohydrologyen_US
dc.subjectdroughten_US
dc.titleThe importance of cuticular permeance in assessing plant water–use strategiesen_US
dc.typeArticleen_US
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