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 language | English (US) |
|---|---|
| Journal | New Phytologist |
| DOIs | |
| State | Accepted/In press - Jan 1 2019 |
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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 journal › Article
}
TY - JOUR
T1 - Temporal shifts in iso/anisohydry revealed from daily observations of plant water potential in a dominant desert shrub
AU - Guo, Jessica S.
AU - Hultine, Kevin R.
AU - Koch, George W.
AU - Kropp, Heather
AU - Ogle, Kiona
PY - 2019/1/1
Y1 - 2019/1/1
N2 - 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.
AB - 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.
KW - anisohydry
KW - drought response
KW - hydraulic behavior
KW - isohydry
KW - Larrea tridentata (creosotebush)
KW - xylem water potential
UR - http://www.scopus.com/inward/record.url?scp=85074651476&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85074651476&partnerID=8YFLogxK
U2 - 10.1111/nph.16196
DO - 10.1111/nph.16196
M3 - Article
AN - SCOPUS:85074651476
JO - New Phytologist
JF - New Phytologist
SN - 0028-646X
ER -