Abstract
The aim of this work was to study the physiological responses of Eucalyptus genotypes seedlings to water availability and potassium fertilization. The plants were grown in pots filled with 7 L of the Quartzenic Neosoil, with low natural content potassium (0,2 mmolc.dm-3 K), and submitted to two irrigation regimes (IR1 – diary and IR2 - cessation of watering until visible wilting occurred), no (K0) and with (K1 - 200 mg.dm-3 K2O) potassium fertilization in greenhouse condition. Photosynthetic rate (A), stomatal conductance (gs), transpiration (E), chlorophyll content index (CCI), relative water content (RWC), photochemical efficiency (Fv/Fm), intrinsic water-use-efficiency (iWUE), instantaneous water-use efficiency (WUE) and leaf water potential (Ψf ) were measured in all plants. The experiment was arranged in randomized block design, in the 5x2x2 factorial schemes with five replicates. Except photochemical efficiency, all physiological traits were significantly affected by water stress with decreased in A, gs and E values and increased in the CCI and iWUE. The application of potassium in water-stressed plants (IR2) promoted higher A, gs, E and RWC. Among genotypes examined, G1 may be considered as the most tolerant and G2 as the most susceptive to water stress. It is concluded that potassium application, could ameliorate negative effects of water stress on early growth stages of Eucalyptus genotypes.
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Claims 8
Claim · model-written summary
Water stress significantly decreased photosynthetic rate, stomatal conductance and transpiration.
- Taxon
- Eucalyptus
.jpg?width=60)
Eucalyptust0 - Treatment
- water stresse0
- Outcome
- A, gs and Ee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Except photochemical efficiency, all physiological traits were significantly affected by water stress with decreased in A, gs and E values and increased in the CCI and iWUE.”
t0“Eucalyptus grandis x E. urophylla”
Claim · model-written summary
Water stress significantly increased chlorophyll content index and intrinsic water use efficiency.
- Taxon
- EucalyptusEucalyptust0
- Treatment
- water stresse0
- Outcome
- CCI and iWUEe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Except photochemical efficiency, all physiological traits were significantly affected by water stress with decreased in A, gs and E values and increased in the CCI and iWUE.”
t0“Eucalyptus grandis x E. urophylla”
Claim · model-written summary
Photochemical efficiency was the exception to significant physiological effects of water stress.
- Taxon
- EucalyptusEucalyptust0
- Treatment
- water stresse0
- Outcome
- photochemical efficiencye0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Except photochemical efficiency, all physiological traits were significantly affected by water stress with decreased in A, gs and E values and increased in the CCI and iWUE.”
t0“Eucalyptus grandis x E. urophylla”
Claim · model-written summary
Potassium application in water-stressed plants raised photosynthetic rate, stomatal conductance and transpiration.
- Taxon
- EucalyptusEucalyptust0
- Treatment
- application of potassiume0
- Outcome
- A, gs, Ee0
- Direction
- highere0
- Qualifier
- water-stressed plants (IR2)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of potassium in water-stressed plants (IR2) promoted higher A, gs, E and RWC.”
t0“Eucalyptus grandis x E. urophylla”
Claim · model-written summary
Potassium application in water-stressed plants raised relative water content.
- Taxon
- EucalyptusEucalyptust0
- Treatment
- application of potassiume0
- Outcome
- RWCe0
- Direction
- highere0
- Qualifier
- water-stressed plants (IR2)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of potassium in water-stressed plants (IR2) promoted higher A, gs, E and RWC.”
t0“Eucalyptus grandis x E. urophylla”
Claim · model-written summary
G1 was judged the most water-stress-tolerant genotype.
- Taxon
- EucalyptusEucalyptust0
- Material
- G1e0
- Outcome
- most tolerante0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Among genotypes examined, G1 may be considered as the most tolerant and G2 as the most susceptive to water stress.”
t0“Eucalyptus grandis x E. urophylla”
Claim · model-written summary
G2 was judged the most susceptible genotype to water stress.
- Taxon
- EucalyptusEucalyptust0
- Material
- G2e0
- Outcome
- most susceptive to water stresse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Among genotypes examined, G1 may be considered as the most tolerant and G2 as the most susceptive to water stress.”
t0“Eucalyptus grandis x E. urophylla”
Claim · model-written summary
Potassium application may ameliorate negative effects of water stress in early Eucalyptus growth.
- Taxon
- EucalyptusEucalyptuse0
- Organ / stage
- early growth stagese0
- Outcome
- potassium application, could ameliorate negative effects of water stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It is concluded that potassium application, could ameliorate negative effects of water stress on early growth stages of Eucalyptus genotypes.”
The same questions in other papers
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
drought · physiology: gas exchange · EucalyptusResults agree
3 papers in the same direction as this paper
- no effect
- no effect
- no effect
drought · physiology: photosynthesis · EucalyptusResults agree
3 papers in the same direction as this paper
- negative
- negative
- negative
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.