Abstract
Juvenile Eucalyptus grandis were exposed to drought and elevated CO2 to evaluate the independent and interactive effects on growth, gas exchange and wood structure. Trees were grown in a greenhouse at ambient and elevated CO2 (aCO2, 410 ppm; eCO2, 950 ppm), in combination with daily irrigation and cyclic drought during one growing season. The results demonstrated that drought stress limited intercellular CO2 concentration, photosynthesis, stomatal conductance, and transpiration, which correlated with a lower increment in height, stem diameter and biomass. Drought also induced formation of frequent and narrow vessels accompanied by a reduction in vessel lumen area. Conversely, elevated CO2 increased intercellular CO2 concentration as well as photosynthesis, and partially closed stomata, leading to a more efficient water use, especially under drought. There was a clear trend towards greater biomass accumulation at eCO2, although the results did not show statistical significance for this parameter. We observed an increase in vessel diameter and vessel lumen area at eCO2, and, contrarily, the vessel frequency decreased. Thus, we conclude that eCO2 delayed the effects of drought and potentialized growth. However, results on vessel anatomy suggest that increasing vulnerability to cavitation due to formation of larger vessels may counteract the beneficial effects of eCO2 under severe drought.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 14
Claim · model-written summary
Drought limited intercellular CO2 concentration, photosynthesis and stomatal conductance in E. grandis.
- Taxon
- Eucalyptus grandis
Eucalyptus grandise1 - Treatment
- drought stresse0
- Outcome
- intercellular CO2 concentration, photosynthesis, stomatal conductancee0
- Direction
- limitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Juvenile Eucalyptus grandis were exposed to drought and elevated CO2”
e0“drought stress limited intercellular CO2 concentration, photosynthesis, stomatal conductance, and transpiration”
Claim · model-written summary
Drought limited transpiration in E. grandis.
- Taxon
- Eucalyptus grandisEucalyptus grandise1
- Treatment
- drought stresse0
- Outcome
- transpiratione0
- Direction
- limitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Juvenile Eucalyptus grandis were exposed to drought and elevated CO2”
e0“drought stress limited intercellular CO2 concentration, photosynthesis, stomatal conductance, and transpiration”
Claim · model-written summary
Drought correlated with a lower increment in height, stem diameter and biomass of E. grandis.
- Taxon
- Eucalyptus grandisEucalyptus grandise1
- Treatment
- drought stresse0
- Outcome
- increment in height, stem diameter and biomasse2
- Direction
- lowere2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Juvenile Eucalyptus grandis were exposed to drought and elevated CO2”
e0“drought stress limited intercellular CO2 concentration, photosynthesis, stomatal conductance, and transpiration”
e2“which correlated with a lower increment in height, stem diameter and biomass”
Claim · model-written summary
Drought induced formation of frequent and narrow vessels in E. grandis.
- Taxon
- Eucalyptus grandisEucalyptus grandise1
- Treatment
- Droughte3
- Outcome
- formation of frequent and narrow vesselse3
- Direction
- inducede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Juvenile Eucalyptus grandis were exposed to drought and elevated CO2”
e3“Drought also induced formation of frequent and narrow vessels accompanied by a reduction in vessel lumen area”
Claim · model-written summary
Drought reduced vessel lumen area in E. grandis.
- Taxon
- Eucalyptus grandisEucalyptus grandise1
- Treatment
- Droughte3
- Outcome
- vessel lumen areae3
- Direction
- reductione3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Juvenile Eucalyptus grandis were exposed to drought and elevated CO2”
e3“Drought also induced formation of frequent and narrow vessels accompanied by a reduction in vessel lumen area”
Claim · model-written summary
Elevated CO2 increased intercellular CO2 concentration and photosynthesis compared with ambient CO2.
- Taxon
- Eucalyptus grandisEucalyptus grandise1
- Treatment
- elevated CO2e4
- Outcome
- intercellular CO2 concentration as well as photosynthesise4
- Direction
- increasede4
- Comparator
- aCO2e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Juvenile Eucalyptus grandis were exposed to drought and elevated CO2”
e4“Conversely, elevated CO2 increased intercellular CO2 concentration as well as photosynthesis, and partially closed stomata”
e5“ambient and elevated CO2 (aCO2, 410 ppm; eCO2, 950 ppm)”
Claim · model-written summary
Elevated CO2 partially closed stomata in E. grandis compared with ambient CO2.
- Taxon
- Eucalyptus grandisEucalyptus grandise1
- Treatment
- elevated CO2e4
- Outcome
- stomatae4
- Direction
- partially closede4
- Comparator
- aCO2e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Juvenile Eucalyptus grandis were exposed to drought and elevated CO2”
e4“Conversely, elevated CO2 increased intercellular CO2 concentration as well as photosynthesis, and partially closed stomata”
e5“ambient and elevated CO2 (aCO2, 410 ppm; eCO2, 950 ppm)”
Claim · model-written summary
Elevated CO2 gave more efficient water use, especially under drought.
- Taxon
- Eucalyptus grandisEucalyptus grandise1
- Treatment
- elevated CO2e4
- Outcome
- water usee6
- Direction
- more efficiente6
- Qualifier
- especially under droughte6
- Comparator
- aCO2e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Juvenile Eucalyptus grandis were exposed to drought and elevated CO2”
e4“Conversely, elevated CO2 increased intercellular CO2 concentration as well as photosynthesis, and partially closed stomata”
e6“leading to a more efficient water use, especially under drought”
e5“ambient and elevated CO2 (aCO2, 410 ppm; eCO2, 950 ppm)”
Claim · model-written summary
Elevated CO2 increased vessel diameter and vessel lumen area in E. grandis.
- Taxon
- Eucalyptus grandisEucalyptus grandise1
- Treatment
- eCO2e7
- Outcome
- vessel diameter and vessel lumen areae7
- Direction
- increasee7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Juvenile Eucalyptus grandis were exposed to drought and elevated CO2”
e7“We observed an increase in vessel diameter and vessel lumen area at eCO2, and, contrarily, the vessel frequency decreased”
Claim · model-written summary
Elevated CO2 decreased vessel frequency in E. grandis.
- Taxon
- Eucalyptus grandisEucalyptus grandise1
- Treatment
- eCO2e7
- Outcome
- vessel frequencye7
- Direction
- decreasede7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Juvenile Eucalyptus grandis were exposed to drought and elevated CO2”
e7“We observed an increase in vessel diameter and vessel lumen area at eCO2, and, contrarily, the vessel frequency decreased”
Claim · model-written summary
Larger vessels formed under elevated CO2 may increase vulnerability to cavitation and counteract the benefits of eCO2 under severe drought.
- Taxon
- Eucalyptus grandisEucalyptus grandise1
- Outcome
- vulnerability to cavitatione2
- Qualifier
- due to formation of larger vesselse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Juvenile Eucalyptus grandis were exposed to drought and elevated CO2”
e2“increasing vulnerability to cavitation due to formation of larger vessels may counteract the beneficial effects of eCO2 under severe drought”
Claim · model-written summary
Elevated CO2 delayed the effects of drought on E. grandis.
- Taxon
- Eucalyptus grandisEucalyptus grandise1
- Treatment
- eCO2e2
- Outcome
- effects of droughte2
- Direction
- delayede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Juvenile Eucalyptus grandis were exposed to drought and elevated CO2”
e2“eCO2 delayed the effects of drought and potentialized growth”
Claim · model-written summary
Elevated CO2 potentialized growth of E. grandis.
- Taxon
- Eucalyptus grandisEucalyptus grandise1
- Treatment
- eCO2e2
- Outcome
- growthe2
- Direction
- potentializede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Juvenile Eucalyptus grandis were exposed to drought and elevated CO2”
e2“eCO2 delayed the effects of drought and potentialized growth”
Claim · model-written summary
Biomass accumulation tended to be greater at elevated CO2, without statistical significance.
- Taxon
- Eucalyptus grandisEucalyptus grandise1
- Treatment
- eCO2e2
- Outcome
- biomass accumulatione2
- Direction
- greatere2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Juvenile Eucalyptus grandis were exposed to drought and elevated CO2”
e2“There was a clear trend towards greater biomass accumulation at eCO2, although the results did not show statistical significance for this parameter”
The same questions in other papers
co2 · growth · Eucalyptus grandis (rose gum)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- no effect
- no effect
- positive
drought · physiology: photosynthesis · Eucalyptus grandis (rose gum)Results agree
1 paper in the same direction as this paper
- negative
drought · physiology: gas exchange · Eucalyptus grandis (rose gum)Results agree
1 paper in the same direction as this paper
- 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.