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  1. Xylem hydraulic safety margins in woody plants: coordination of stomatal control of xylem tension with hydraulic capacitance

    The xylem pressure inducing 50% loss of hydraulic conductivity due to embolism (P50) is widely used for comparisons of xylem vulnerability among species and across aridity gradients. However, despite its utility as an index of resistance to catastrophic xylem failure under extreme drought, P50 may have no special...

    Author(s):
    Frederick C. Meinzer; Daniel M. Johnson; Barbara Lachenbruch; Katherine A. McCulloh; David R. Woodruff
    Year:
    2009
    Keywords:
    drought, hydraulic architecture, xylem embolism, plant-water relations, transpiration
    Source:
    Functional Ecology. 23: 922-930

  2. Transgenic poplars with reduced lignin show impaired xylem conductivity, growth efficiency and survival

    We studied xylem anatomy and hydraulic architecture in 14 transgenic insertion events and a control line of hybrid poplar (Populus spp.) that varied in lignin content. Transgenic events had different levels of down-regulation of two genes encoding 4-coumarate:coenzyme A ligase (4CL). Two-year-old trees were characterized after...

    Author(s):
    Steven L. Voelker; Barbara Lachenbruch; Frederick C. Meinzer; Peter Kitin; Steven H. Strauss
    Year:
    2011
    Keywords:
    biomass, cavitation, embolism, hydraulic architecture, leaf area, moisture content, P50, sapwood area, shoot dieback, xylem
    Source:
    Plant, Cell and Environment. 34: 655-668

  3. Drought resistance in early and late secondary successional species from a tropical dry forest: the interplay between xylem resistance to embolism, sapwood water storage and leaf shedding

    The mechanisms of drought resistance that allow plants to successfully establish at different stages of secondary succession in tropical dry forests are not well understood. We characterized mechanisms of drought resistance in early and late-successional species and tested whether risk of drought differs across sites at different successional stages, and whether early...

    Author(s):
    Fernando Pineda-Garcia; Horacio Paz; Frederick C. Meinzer
    Year:
    2013
    Keywords:
    drought avoidance, drought tolerance, evolutionary trade-off, hydraulic architecture, secondary succession, soil drought, stem water storage capacity
    Source:
    Plant, Cell and Environment. 36: 405-418

  4. Coordination of leaf and stem water transport properties in tropical forest trees

    Stomatal regulation of transpiration constrains leaf water potential (ψ l) within species-specific ranges that presumably avoid excessive tension and embolism in the stem xylem upstream. However, the hydraulic resistance of leaves can be highly variable over short time scales, uncoupling tension in the xylem of leaves from that in the...

    Author(s):
    Frederick C. Meinzer; David R. Woodruff; Jean-Christophe Domec; Guillermo Goldstein; Paula I. Campanello; Genoveva M. Gatti; Randol Villalobos-Vega
    Year:
    2008
    Keywords:
    Capacitance, Stomata, Transpiration, Turgor, Xylem vulnerability
    Source:
    Oecologia: Vol 156 pgs 31-41
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