Abstract
Abstract It has been suggested that a trade‐off between hydraulic efficiency and safety is related to drought adaptation across species. However, whether leaf hydraulic efficiency is sacrificed for safety during woody resprout regrowth after crown removal is not well understood. We measured leaf water potential ( ψ leaf ) at predawn ( ψ pd ) and midday ( ψ mid ), leaf maximum hydraulic conductance ( K leaf‐max ), ψ leaf at induction 50% loss of K leaf‐max ( K leaf P 50 ), leaf area‐specific whole‐plant hydraulic conductance (LSC), leaf vein structure and turgor loss point ( π tlp ) in 1‐ to 13‐year‐old resprouts of the aridland shrub ( Caragana korshinskii ). ψ pd was similar, ψ mid and K leaf P 50 became more negative, and K leaf–max decreased in resprouts with the increasing age; thus, leaf hydraulic efficiency clearly traded off against safety. The difference between ψ mid and K leaf P 50 , leaf hydraulic safety margin, increased gradually with increasing resprout age. More negative ψ mid and K leaf P 50 were closely related to decreasing LSC and more negative π tlp , respectively, and the decreasing K leaf‐max arose from the lower minor vein density and the narrower midrib xylem vessels. Our results showed that a clear trade‐off between leaf hydraulic efficiency and safety helps C. korshinskii resprouts adapt to increasing water stress as they approach final size.
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Claims 8
Claim · model-written summary
Predawn leaf water potential was similar across resprouts of different ages.
- Taxon
- Caragana korshinskiiCaragana korshinskiit0
- Outcome
- ψ pde0
- Direction
- similare0
Verbatim
t0“Caragana korshinskii”
e0“ψ pd was similar”
Claim · model-written summary
Midday leaf water potential and leaf P50 became more negative with increasing resprout age.
- Taxon
- Caragana korshinskiiCaragana korshinskiit0
- Outcome
- ψ mid and K leaf P 50e0
- Direction
- more negativee0
Verbatim
t0“Caragana korshinskii”
e0“ψ mid and K leaf P 50 became more negative”
Claim · model-written summary
Leaf maximum hydraulic conductance decreased in resprouts with increasing age.
- Taxon
- Caragana korshinskiiCaragana korshinskiit0
- Outcome
- leaf maximum hydraulic conductancee1
- Direction
- decreasede2
- Qualifier
- increasing agee2
Verbatim
t0“Caragana korshinskii”
e1“leaf maximum hydraulic conductance”
e2“decreased in resprouts with the increasing age”
Claim · model-written summary
Leaf hydraulic efficiency clearly traded off against safety as resprouts aged.
- Taxon
- Caragana korshinskiiCaragana korshinskiit0
- Outcome
- leaf hydraulic efficiencye0
- Qualifier
- traded off against safetye0
Verbatim
t0“Caragana korshinskii”
e0“leaf hydraulic efficiency clearly traded off against safety”
Claim · model-written summary
The leaf hydraulic safety margin increased gradually with increasing resprout age.
- Taxon
- Caragana korshinskiiCaragana korshinskiit0
- Outcome
- leaf hydraulic safety margine0
- Direction
- increasede0
- Qualifier
- increasing resprout agee0
Verbatim
t0“Caragana korshinskii”
e0“leaf hydraulic safety margin, increased gradually with increasing resprout age”
Claim · model-written summary
More negative midday leaf water potential and leaf P50 were closely related to decreasing whole-plant hydraulic conductance and more negative turgor loss point, respectively.
- Taxon
- Caragana korshinskiiCaragana korshinskiit0
- Outcome
- ψ mid and K leaf P 50e0
- Direction
- More negativee0
- Qualifier
- closely related to decreasing LSC and more negative π tlpe0
Verbatim
t0“Caragana korshinskii”
e0“More negative ψ mid and K leaf P 50 were closely related to decreasing LSC and more negative π tlp , respectively”
Claim · model-written summary
The decrease in leaf maximum hydraulic conductance arose from lower minor vein density and narrower midrib xylem vessels.
- Taxon
- Caragana korshinskiiCaragana korshinskiit0
- Organ / stage
- midrib xylem vesselse2
- Outcome
- leaf maximum hydraulic conductancee1
- Qualifier
- lower minor vein density and the narrower midrib xylem vesselse2
Verbatim
t0“Caragana korshinskii”
e1“leaf maximum hydraulic conductance”
e2“arose from the lower minor vein density and the narrower midrib xylem vessels”
Claim · model-written summary
The trade-off between leaf hydraulic efficiency and safety helps C. korshinskii resprouts adapt to increasing water stress as they approach final size.
- Taxon
- C. korshinskiiCaragana korshinskiie0
- Outcome
- adapt to increasing water stresse0
- Qualifier
- as they approach final sizee0
Verbatim
e0“helps C. korshinskii resprouts adapt to increasing water stress as they approach final size”