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  1. Growth and physiological responses of isohydric and anisohydric poplars to drought

    Understanding how different plants prioritize carbon gain and drought vulnerability under a variable water supply is important for predicting which trees will maximize woody biomass production under different environmental conditions. Here, Populus balsamifera (BS, isohydric genotype), P. simonii (SI, previously uncharacterized stomatal behaviour), and their cross, P....

    Author(s):
    Ziv Attia; Jean-Christophe Domec; Ram Oren; Danielle A. Way; Menachem Moshelion
    Year:
    2015
    Keywords:
    Bioenergy, biomass, carbon, hydraulic conductance, stomata, transpiration
    Source:
    Journal of Experimental Botany

  2. Does homeostasis or disturbance of homeostasis in minimum leaf water potential explain the isohydric versus anisohydric behavior of Vitis vinifera L. cultivars?

    Due to the diurnal and seasonal fluctuations in leaf-to-air vapor pressure deficit (D), one of the key regulatory roles played by stomata is to limit transpiration-induced leaf water deficit. Different types of plants are known to vary in the sensitivity of stomatal conductance (gs) to D with important consequences for their survival and growth. Plants that minimize...

    Author(s):
    Jean-Christophe Domec; Daniel M. Johnson
    Year:
    2012
    Keywords:
    Source:
    Tree Physiology 32:245–248

  3. Dynamics of stem water uptake among isohydric and anisohydric species experiencing a severe drought

    Predicting the impact of drought on forest ecosystem processes requires an understanding of trees' species-specific responses to drought, especially in the Eastern USA, where species composition is highly dynamic due to historical changes in land use and fire regime. Here, we adapted a framework that classifies trees' water-use strategy along the spectrum of...

    Author(s):
    Koong Yi; Danilo Dragoni; Richard P. Phillips; Daniel Tyler Roman; Kimberly A. Novick
    Year:
    2017
    Keywords:
    anisohydric, drought, hydraulic capacitance, isohydric, sap flux, stomatal conductance, water regulation
    Source:
    Tree Physiology. 14 p.

  4. Stomatal kinetics and photosynthetic gas exchange along a continuum of isohydric to anisohydric regulation of plant water status

    Species’ differences in the stringency of stomatal control of plant water potential represent a continuum of isohydric to anisohydric behaviours. However, little is known about how quasi-steady-state stomatal regulation of water potential may relate to dynamic behaviour of stomata and photosynthetic gas exchange in species operating at different positions along this...

    Author(s):
    Frederick C. Meinzer; Duncan D. Smith; David R. Woodruff; Danielle E. Marias; Katherine A. McCulloh; Ava R. Howard; Alicia L. Magedman
    Year:
    2017
    Keywords:
    Anisohydry, intrinsic water-use efficiency, photosynthesis, turgor.
    Source:
    Plant, Cell & Environment. 40(8): 1618-1628

  5. Capturing species-level drought responses in a temperate deciduous forest using ratios of photochemical reflectance indices between sunlit and shaded canopies

    To classify trees along a spectrum of isohydric to anisohydric behavior is a promising new framework for identifying tree species' sensitivities to drought stress, directly related to the vulnerability of carbon uptake of terrestrial ecosystems with increased hydroclimate variability. Trees with isohydric strategies regulate stomatal conductance to maintain...

    Author(s):
    Taehee Hwang; Hamed Gholizadeh; Daniel A. Sims; Kimberly A. Novick; Edward R. Brzostek; Richard P. Phillips; Daniel T. Roman; Scott M. Robeson; Abdullah F. Rahman
    Year:
    2017
    Keywords:
    PRI, Isohydricity, Drought, LUE, Imaging spectroscopy, MODIS
    Source:
    Remote Sensing of Environment

  6. Anisohydric water use behavior links growing season evaporative demand to ring-width increment in conifers from summer-dry environments

    Conifers in the Pinaceae and Cupressaceae from dry environments have been shown to broadly differ in their stomatal sensitivity to soil drying that result in isohydric versus anisohydric water use behavior, respectively. Here, we first employ a series of drought experiments and field observations to confirm the degree of isohydric versus anisohydric water use behavior...

    Author(s):
    Steve L. Voelker; R. Justin DeRose; Matthew F. Bekker; Chalita Sriladda; Nisa Leksungnoen; Roger K. Kjelgren
    Year:
    2018
    Keywords:
    dendrochronology, drought tolerance, stomatal conductance, tree growth, water potential, water use behavior
    Source:
    Trees. 32: 735-749.

  7. Dynamics of leaf water relations components in co-occurring iso- and anisohydric conifer species

    Because iso- and anisohydric species differ in stomatal regulation of the rate and magnitude of fluctuations in shoot water potential, they may be expected to show differences in the plasticity of their shoot water relations components, but explicit comparisons of this nature have rarely been made. We subjected excised shoots of co-occurring anisohydric Juniperus...

    Author(s):
    Frederick Meinzer; David Woodruff; Danielle Marias; Katherine McCulloh; Sanna Sevanto
    Year:
    2014
    Keywords:
    anisohydry, drought, isohydry, osmotic potential, turgor.
    Source:
    Plant, Cell & Environment. 37(11): 2577-2586.

  8. The Role of Xylem Sap Abscisic Acid in Leaf Abscission of Droughted Seedlings of Isohydric and Anisohydric Temperate Deciduous Angiosperms

    Presented at the Proceedings of the 14th Central Hardwood Forest conference held March 16-19 in Wooster Ohio

    Author(s):
    Stephen G. Pallardy; Nancy J. Loewenstein
    Year:
    2004
    Keywords:
    Central Hardwood, silviculture, oak-hickory, upland hardwoods, bottomland hardwoods
    Source:
    In: Yaussy, Daniel A.; Hix, David M.; Long, Robert P.; Goebel, P. Charles, eds. Proceedings, 14th Central Hardwood Forest Conference; 2004 March 16-19; Wooster, OH. Gen. Tech. Rep. NE-316. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station: 365-372

  9. Drought limitations to leaf-level gas exchange: results from a model linking stomatal optimization and cohesion-tension theory

    We merge concepts from stomatal optimization theory and cohesion–tension theory to examine the dynamics of three mechanisms that are potentially limiting to leaf-level gas exchange in trees during drought: (1) a ‘demand limitation’ driven by an assumption of optimal stomatal functioning; (2) ‘hydraulic limitation’ of water movement from the roots to the leaves...

    Author(s):
    Kimberly A. Novick; Chelcy F. Miniat; James M. Vose
    Year:
    2016
    Keywords:
    Stomatal conductance, transpiration, isohydric, anisohydric, water use efficiency, capacitance
    Source:
    Plant, Cell & Environment

  10. Linking variation in intrinsic water-use efficiency to isohydricity: a comparison at multiple spatiotemporal scales

    Species-specific responses of plant intrinsic water-use efficiency (iWUE) to multiple environmental drivers associated with climate change, including soil moisture (θ), vapor pressure deficit (D), and atmospheric CO2 concentration (ca), are poorly understood. We...

    Author(s):
    Koong Yi; Justin T. Maxwell; Matthew K. Wenzel; D. Tyler Roman; Peter E. Sauer; Richard P. Phillips; Kimberly A. Novick
    Year:
    2018
    Keywords:
    anisohydric, climate change, dendrochronology, drought, isohydric, stable carbon isotope composition (d13C), vapor pressure deficit, water-use efficiency (WUE).
    Source:
    New Phytologist

  11. Mapping ‘hydroscapes’ along the iso- to anisohydric continuum of stomatal regulation of plant water status

    The concept of iso- vs. anisohydry has been used to describe the stringency of stomatal regulation of plant water potential (ψ). However, metrics that accurately and consistently quantify species’ operating ranges along a continuum of iso- to anisohydry have been elusive. Additionally, most approaches to quantifying iso/anisohydry require labour-intensive measurements...

    Author(s):
    Frederick C. Meinzer; David R. Woodruff; Danielle E. Marias; Duncan D. Smith; Katherine A. McCulloh; Ava R. Howard; Alicia L. Magedman; Josep Penuelas
    Year:
    2016
    Keywords:
    Anisohydry, drought resistance, isohydry, leaf osmotic potential, leaf turgor, plant traits, plant water potential, stomata.
    Source:
    Ecology Letters. 19(11): 1343-1352.

  12. Mechanisms of plant survival and mortality during drought: Why do some plants survive while others succumb to drought?

    Severe droughts have been associated with regional-scale forest mortality worldwide. Climate change is expected to exacerbate regional mortality events; however, prediction remains difficult because the physiological mechanisms underlying drought survival and mortality are poorly understood. We developed a hydraulically based theory considering carbon balance and...

    Author(s):
    Nate McDowell; William T. Pockman; Craig D. Allen; David D. Breshears; Neil Cobb; Thomas Kolb; Jennifer Plaut; John Sperry; Adam West; David G. Williams; Enrico A. Yepez
    Year:
    2008
    Keywords:
    climate, die-off, hydraulics, vegetation mortality, water relations
    Source:
    New Phytologist. 178: 719-739.

  13. Metrics and proxies for stringency of regulation of plant water status (iso/anisohydry): a global data set reveals coordination and trade-offs among water transport traits

    Plants operate along a continuum of stringency of regulation of plant water potential from isohydry to anisohydry. However, most metrics and proxies of plant iso/anisohydric behavior have been developed from limited sets of site-specific experiments. Understanding the underlying mechanisms that determine species’ operating ranges along this continuum, independent of...

    Author(s):
    Xiaoli Fu; Frederick C. Meinzer
    Year:
    2018
    Keywords:
    Anisohydry, drought tolerance, hydraulic architecture, hydraulic safety margin, isohydry, leaf osmotic potential, plant functional traits, stomata, wood density, xylem embolism resistance.
    Source:
    Tree Physiology. 39(1): 122-134.

  14. Linking nonstructural carbohydrate dynamics to gas exchange and leaf hydraulic behavior in Pinus edulis and Juniperus monosperma

    • Leaf hydraulics, gas exchange and carbon storage in Pinus edulis and Juniperus monosperma, two tree species on opposite ends of the isohydry–anisohydry spectrum, were analyzed to examine relationships between hydraulic function and carbohydrate dynamics.
    • Leaf hydraulic vulnerability,...

      Author(s):
      David R. Woodruff; Frederick C. Meinzer; Danielle E. Marias; Sanna Sevanto; Michael W. Jenkins; Nate G. McDowell
      Year:
      2014
      Keywords:
      carbon starvation, carbon storage, drought, growth limitation, Juniperus monosperma, leaf hydraulics, nonstructural carbohydrate (NSC), Pinus edulis.
      Source:
      New Phytologist

  15. Forest canopy hydraulics

    Water and carbon cycles are strongly coordinated and water availability is a primary limiting factor in many terrestrial ecosystems. Photosynthesis requires sufficient water supply to leaves and constraints on delivery at any point in the hydraulic continuum can lead to stomatal closure and reduced photosynthesis. Thus, maximizing water transport enhances assimilation...

    Author(s):
    David R. Woodruff; Frederick C. Meinzer; Katherine A. McCulloh
    Year:
    2016
    Keywords:
    Academics, students, scientists
    Source:
    Book - Canopy Photosynthesis: From Basics to Applications. Volume 42 of the series Advances in Photosynthesis and Respiration. Springer Netherlands

  16. Non-native tree in a dry coastal area in Hawai'i has high transpiration but restricts water use despite phreatophytic trait

    In arid systems, phreatophytes are often among the most effective invaders because of their capacity to access and exploit groundwater resources otherwise unavailable to native vegetation. On Hawai'i Island, a non‐native phreatophyte, Prosopis pallida (kiawe), has invaded extensive dry lowland areas following its introduction in the...

    Author(s):
    Yoshiyuki Miyazawa; Bruce D. Dudley; R. Flint Hughes; Joshua Vandemark; Susan Cordell; Michael A. Nullet; Rebecca Ostertag; Thomas W. Giambelluca
    Year:
    2016
    Keywords:
    coastal groundwater, carbon assimilation, invasive species, sap flow, stomatal control
    Source:
    Ecohydrology. 9(7): 1166-1176

  17. Climate change may increase the drought stress of mesophytic trees downslope with ongoing forest mesophication under a history of fire suppression

    In mountainous headwater catchments, downslope flow of subsurface water could buffer downslope forest communities from soil moisture stress during drought. Here we investigated changes in landscape-scale vegetation patterns at five forested headwater catchments in the Coweeta Hydrologic Laboratory in the southern Appalachians. We used a ca. 30-year Landsat...

    Author(s):
    Taehee Hwang; Lawrence E. Band; Chelcy F. Miniat; James M. Vose; Jennifer D. Knoepp; Conghe Song; Paul V Bolstad
    Year:
    2020
    Keywords:
    Forest mesophication, fire suppression, isohydricity and anisohydricity, forest hydrology, drought
    Source:
    Frontiers in Forests and Global Change

  18. Forest tree growth response to hydroclimate variability in the southern Appalachians

    Climate change will affect tree species growth and distribution; however, under the same climatic conditions species may differ in their response according to site conditions. We evaluated the climate-driven patterns of growth for six dominant deciduous tree species in the southern Appalachians. We categorized species into two functional groups based on their stomatal...

    Author(s):
    Katherine J. Elliott; Chelcy Ford Miniat; Neil Pederson; Stephanie H. Laseter
    Year:
    2015
    Keywords:
    radial growth, hydroclimate, tree-rings, small storms, ring-porous, diffuse-porous, structural equation modeling, productivity
    Source:
    Global Change Biology

  19. Are Northeastern U.S. forests vulnerable to extreme drought?

    In the Northeastern U.S., drought is expected to increase in frequency over the next century, and therefore, the responses of trees to drought are important to understand. There is recent debate about whether land-use change or moisture availability is the primary driver of changes in forest species composition in this region. Some argue that fire suppression from the...

    Author(s):
    Adam P. Coble; Matthew A. Vadeboncoeur; Z. Carter Berry; Katie A. Jennings; Cameron D. McIntire; John L. Campbell; Lindsey E. Rustad; Pamela H. Templer; Heidi Asbjornsen
    Year:
    2017
    Keywords:
    Acer Betula, Drought sensitivity, Drought tolerance, Quercus, Northeastern U.S. Temperate deciduous, drought
    Source:
    Ecological Processes
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