Abstract
The objective of this study was to quantify the effect of potassium (K) supply on osmotic adjustment and drought avoidance mechanisms of Eucalyptus seedlings growing under short-term water stress. The effects of K supply on plant growth, nutritional status, leaf gas exchange parameters, leaf water potential (Ψw), leaf area (LA), stomatal density (SD), leaf carbon (C) and nitrogen (N) isotopic compositions (δ13C and δ15N ‰) and leaf C/N ratio under polyethylene glycol (PEG)-induced water deficit were measured. Under both control (non-PEG) and osmotic stress (+PEG) conditions, K supply increased plant growth, boosting dry matter yield with decreased C/N leaf ratio and δ15N ‰ values. The +PEG significantly reduced LA, plant growth, dry matter yield, Ψw, number of stomata per plant and leaf gas exchange, relative to non-PEG condition. Potassium supply alleviated osmotic-induced alterations in Eucalyptus seedlings by better regulating leaf development as well as SD, thus improving the rate of leaf gas exchange parameters, mesophyll conductance to CO2 (lower δ13C ‰ values) and water use efficiency (WUE). Consequently, K-supplied plants under drought better acclimated to osmotic stress than K-deficient plants, which in turn induced lower CO2 assimilation and dry matter yield, as well as higher leaf δ13C ‰ and δ15N ‰ values. In conclusion, management practices should seek to optimize K-nutrition to improve WUE, photosynthesis-related parameters and plant growth under water deficit conditions.
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Claims 14
Claim · model-written summary
Potassium supply increased Eucalyptus plant growth under both non-PEG and osmotic stress conditions.
- Taxon
- Eucalyptus
.jpg?width=60)
Eucalyptust0 - Treatment
- K supplye0
- Outcome
- plant growthe0
- Direction
- increasede0
- Comparator
- control (non-PEG) and osmotic stress (+PEG) conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“Eucalyptus”
e0“Under both control (non-PEG) and osmotic stress (+PEG) conditions, K supply increased plant growth”
Claim · model-written summary
Potassium supply increased Eucalyptus dry matter yield under non-PEG and osmotic stress conditions.
- Taxon
- EucalyptusEucalyptust0
- Treatment
- K supplye0
- Outcome
- dry matter yielde0
- Direction
- boostinge0
- Comparator
- control (non-PEG) and osmotic stress (+PEG) conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Eucalyptus”
e0“Under both control (non-PEG) and osmotic stress (+PEG) conditions, K supply increased plant growth, boosting dry matter yield”
Claim · model-written summary
Potassium supply decreased Eucalyptus leaf C/N ratio under non-PEG and osmotic stress conditions.
- Taxon
- EucalyptusEucalyptust0
- Treatment
- K supplye0
- Outcome
- C/N leaf ratioe0
- Direction
- decreasede0
- Comparator
- control (non-PEG) and osmotic stress (+PEG) conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Eucalyptus”
e0“Under both control (non-PEG) and osmotic stress (+PEG) conditions, K supply increased plant growth, boosting dry matter yield with decreased C/N leaf ratio”
Claim · model-written summary
Potassium supply decreased Eucalyptus leaf δ15N values under non-PEG and osmotic stress conditions.
- Taxon
- EucalyptusEucalyptust0
- Treatment
- K supplye0
- Outcome
- δ15N ‰ valuese0
- Direction
- decreasede0
- Comparator
- control (non-PEG) and osmotic stress (+PEG) conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Eucalyptus”
e0“Under both control (non-PEG) and osmotic stress (+PEG) conditions, K supply increased plant growth, boosting dry matter yield with decreased C/N leaf ratio and δ15N ‰ values”
Claim · model-written summary
PEG-induced osmotic stress significantly reduced Eucalyptus leaf area, plant growth, and dry matter yield relative to non-PEG conditions.
- Taxon
- EucalyptusEucalyptust0
- Treatment
- +PEGe0
- Outcome
- LA, plant growth, dry matter yielde0
- Direction
- reducede0
- Comparator
- non-PEG conditione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Eucalyptus”
e0“The +PEG significantly reduced LA, plant growth, dry matter yield, Ψw, number of stomata per plant and leaf gas exchange, relative to non-PEG condition”
Claim · model-written summary
PEG-induced osmotic stress significantly reduced Eucalyptus leaf water potential relative to non-PEG conditions.
- Taxon
- EucalyptusEucalyptust0
- Treatment
- +PEGe0
- Outcome
- Ψwe0
- Direction
- reducede0
- Comparator
- non-PEG conditione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Eucalyptus”
e0“The +PEG significantly reduced LA, plant growth, dry matter yield, Ψw, number of stomata per plant and leaf gas exchange, relative to non-PEG condition”
Claim · model-written summary
PEG-induced osmotic stress significantly reduced Eucalyptus stomata per plant and leaf gas exchange relative to non-PEG conditions.
- Taxon
- EucalyptusEucalyptust0
- Treatment
- +PEGe0
- Outcome
- number of stomata per plant and leaf gas exchangee0
- Direction
- reducede0
- Comparator
- non-PEG conditione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Eucalyptus”
e0“The +PEG significantly reduced LA, plant growth, dry matter yield, Ψw, number of stomata per plant and leaf gas exchange, relative to non-PEG condition”
Claim · model-written summary
Potassium supply improved Eucalyptus leaf gas exchange and mesophyll conductance to CO2 under osmotic stress.
- Taxon
- EucalyptusEucalyptust0
- Treatment
- Potassium supplye0
- Outcome
- leaf gas exchange parameters, mesophyll conductance to CO2e0
- Direction
- improvinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Eucalyptus”
e0“Potassium supply alleviated osmotic-induced alterations in Eucalyptus seedlings by better regulating leaf development as well as SD, thus improving the rate of leaf gas exchange parameters, mesophyll conductance to CO2”
Claim · model-written summary
Potassium supply was associated with lower Eucalyptus leaf δ13C values under osmotic stress.
- Taxon
- EucalyptusEucalyptust0
- Treatment
- Potassium supplye0
- Outcome
- δ13C ‰ valuese0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Eucalyptus”
e0“Potassium supply alleviated osmotic-induced alterations in Eucalyptus seedlings by better regulating leaf development as well as SD, thus improving the rate of leaf gas exchange parameters, mesophyll conductance to CO2 (lower δ13C ‰ values)”
Claim · model-written summary
Potassium supply improved Eucalyptus water use efficiency under osmotic stress.
- Taxon
- EucalyptusEucalyptust0
- Treatment
- Potassium supplye0
- Outcome
- water use efficiency (WUE)e0
- Direction
- improvinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Eucalyptus”
e0“Potassium supply alleviated osmotic-induced alterations in Eucalyptus seedlings by better regulating leaf development as well as SD, thus improving the rate of leaf gas exchange parameters, mesophyll conductance to CO2 (lower δ13C ‰ values) and water use efficiency (WUE)”
Claim · model-written summary
Under drought, potassium-supplied Eucalyptus plants acclimated better to osmotic stress than potassium-deficient plants.
- Taxon
- EucalyptusEucalyptust0
- Treatment
- K-suppliede0
- Outcome
- acclimated to osmotic stresse0
- Direction
- bettere0
- Comparator
- K-deficient plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Eucalyptus”
e0“K-supplied plants under drought better acclimated to osmotic stress than K-deficient plants”
Claim · model-written summary
Potassium-deficient Eucalyptus plants had lower CO2 assimilation and dry matter yield under drought.
- Taxon
- EucalyptusEucalyptust0
- Material
- K-deficient plantse0
- Outcome
- CO2 assimilation and dry matter yielde0
- Direction
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Eucalyptus”
e0“K-deficient plants, which in turn induced lower CO2 assimilation and dry matter yield”
Claim · model-written summary
Potassium-deficient Eucalyptus plants had higher leaf δ13C and δ15N values under drought.
- Taxon
- EucalyptusEucalyptust0
- Material
- K-deficient plantse0
- Outcome
- leaf δ13C ‰ and δ15N ‰ valuese0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Eucalyptus”
e0“K-deficient plants, which in turn induced lower CO2 assimilation and dry matter yield, as well as higher leaf δ13C ‰ and δ15N ‰ values”
Claim · model-written summary
The authors recommend optimizing potassium nutrition to improve Eucalyptus water use efficiency, photosynthesis-related parameters, and growth under water deficit.
- Taxon
- EucalyptusEucalyptust0
- Outcome
- optimize K-nutrition to improve WUE, photosynthesis-related parameters and plant growth under water deficit conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Eucalyptus”
e0“management practices should seek to optimize K-nutrition to improve WUE, photosynthesis-related parameters and plant growth under water deficit conditions”
The same questions in other papers
poly(ethylene glycol) · growth · EucalyptusPositive and negative results
1 in the opposite direction
- positive
potassium · physiology: gas exchange · EucalyptusResults agree
1 paper in the same direction as this paper
- positive
potassium · physiology: water · EucalyptusResults agree
1 paper in the same direction as this paper
- positive
potassium · growth · EucalyptusResults agree
1 paper in the same direction as this paper
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.