Temporal shifts in iso/anisohydry revealed from daily observations of plant water potential in a dominant desert shrub

Jessica S. Guo, Kevin R. Hultine, George W. Koch, Heather Kropp, Kiona Ogle

Research output: Contribution to journalArticle

Abstract

Plant species are characterized along a spectrum of isohydry to anisohydry depending on their regulation of water potential (Ψ), but the plasticity of hydraulic strategies is largely unknown. The role of environmental drivers was evaluated in the hydraulic behavior of Larrea tridentata, a drought-tolerant desert shrub that withstands a wide range of environmental conditions. With a 1.5 yr time-series of 2324 in situ measurements of daily predawn and midday Ψ, the temporal variability of hydraulic behavior was explored in relation to soil water supply, atmospheric demand and temperature. Hydraulic behavior in Larrea was highly dynamic, ranging from partial isohydry to extreme anisohydry. Larrea exhibited extreme anisohydry under wet soil conditions corresponding to periods of high productivity, whereas partial isohydry was exhibited after prolonged dry or cold conditions, when productivity was low. Environmental conditions can strongly influence plant hydraulic behavior at relatively fast timescales, which enhances our understanding of plant drought responses. Although species may exhibit a dominant hydraulic behavior, variable environmental conditions can prompt plasticity in Ψ regulation, particularly for species in seasonally dry climates.

Original languageEnglish (US)
JournalNew Phytologist
DOIs
StateAccepted/In press - Jan 1 2019

Fingerprint

Larrea
water potential
deserts
fluid mechanics
shrubs
Droughts
Water
Soil
Water Supply
Climate
environmental factors
drought
Larrea tridentata
Temperature
water supply
time series analysis
soil quality
soil water
climate

Keywords

  • anisohydry
  • drought response
  • hydraulic behavior
  • isohydry
  • Larrea tridentata (creosotebush)
  • xylem water potential

ASJC Scopus subject areas

  • Physiology
  • Plant Science

Cite this

Temporal shifts in iso/anisohydry revealed from daily observations of plant water potential in a dominant desert shrub. / Guo, Jessica S.; Hultine, Kevin R.; Koch, George W.; Kropp, Heather; Ogle, Kiona.

In: New Phytologist, 01.01.2019.

Research output: Contribution to journalArticle

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