Abstract
Five species of Eucalyptus (E. grandis, E. urophylla, E. camaldulensis, E. torelliana, and E. phaeotrica), among the ten species most commonly used in large scale plantations, were selected for studies on the effects of elevated CO2 concentration [CO2] and drought stress on stomatal responses of 2.5-month old seedlings. The first three species belong to the subgenus Smphyomyrtus, whereas the fourth species belongs to the subgenus Corymbia and E. phaeotrica is from the subgenus Monocalyptus. Seedlings were grown in four pairs of open-top chambers, arranged to have 2 plants of each species in each chamber, with four replications in each of two CO2 concentrations: 350 ± 30 mumol mol-1 and 700 ± 30 mumol mol-1. After 100 days in the chambers, a series of gas exchange measurements were made. Half the plants in each chamber, one plant per species per chamber, were drought-stressed by withholding irrigation, while the remaining plants continued to be watered daily. Drought stress decreased stomatal conductance, photosynthesis and transpiration rates in all the species. The effect of drought stress on stomatal closure was similar in both [CO2]. The positive effects of elevated [CO2] on photosynthesis and water use efficiency were maintained longer during the stress period than under well-watered conditions. The photosynthetic rate of E. phaeotrica was higher even in the fourth day of the drought stress. Drought stress increased photoinhibition of photosynthesis, as measured by chlorophyll fluorescence, which varied among the species, as well as in relation to [CO2]. The results are in agreement with observed differences in stomatal responses between some eucalyptus species of the subgenera Symphyomyrtus and Monocalyptus.
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 7
Claim · model-written summary
Drought stress decreased stomatal conductance, photosynthesis and transpiration rates in all Eucalyptus species
- Taxon
- Eucalyptus
.jpg?width=60)
Eucalyptust0 - Treatment
- Drought stresse1
- Outcome
- stomatal conductance, photosynthesis and transpiration ratese1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“Eucalyptus species”
e1“Drought stress decreased stomatal conductance, photosynthesis and transpiration rates in all the species”
Claim · model-written summary
The effect of drought stress on stomatal closure was similar under both CO2 concentrations
- Taxon
- EucalyptusEucalyptust0
- Treatment
- drought stresse2
- Outcome
- stomatal closuree2
- Direction
- similare2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Eucalyptus species”
e2“The effect of drought stress on stomatal closure was similar in both [CO2]”
Claim · model-written summary
Positive effects of elevated CO2 on photosynthesis and water use efficiency were maintained longer during drought than under well-watered conditions
- Taxon
- EucalyptusEucalyptust0
- Treatment
- elevated [CO2]e3
- Outcome
- photosynthesis and water use efficiencye3
- Direction
- maintained longere3
- Comparator
- well-watered conditionse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Eucalyptus species”
e3“The positive effects of elevated [CO2] on photosynthesis and water use efficiency were maintained longer during the stress period than under well-watered conditions”
Claim · model-written summary
Photosynthetic rate of E. phaeotrica was higher on the fourth day of drought stress
Not reportedComparator
Verbatim
t0“Eucalyptus species”
e4“The photosynthetic rate of E. phaeotrica was higher even in the fourth day of the drought stress”
Claim · model-written summary
Drought stress increased photoinhibition of photosynthesis, measured by chlorophyll fluorescence
- Taxon
- EucalyptusEucalyptust0
- Treatment
- Drought stresse5
- Outcome
- photoinhibition of photosynthesise5
- Direction
- increasede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Eucalyptus species”
e5“Drought stress increased photoinhibition of photosynthesis, as measured by chlorophyll fluorescence, which varied among the species, as well as in relation to [CO2]”
Claim · model-written summary
Photoinhibition under drought varied among Eucalyptus species and with CO2 concentration
- Taxon
- EucalyptusEucalyptust0
- Treatment
- Drought stresse5
- Outcome
- photoinhibition of photosynthesise5
- Qualifier
- varied among the species, as well as in relation to [CO2]e5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Eucalyptus species”
e5“Drought stress increased photoinhibition of photosynthesis, as measured by chlorophyll fluorescence, which varied among the species, as well as in relation to [CO2]”
Claim · model-written summary
Stomatal responses differ between Eucalyptus subgenera Symphyomyrtus and Monocalyptus, in agreement with earlier observations
- Taxon
- Eucalyptus speciesEucalyptust0
- Material
- subgenera Symphyomyrtus and Monocalyptuse6
- Outcome
- stomatal responsese6
- Direction
- differencese6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Eucalyptus species”
e6“The results are in agreement with observed differences in stomatal responses between some eucalyptus species of the subgenera Symphyomyrtus and Monocalyptus”
The same questions in other papers
co2 · physiology: photosynthesis · EucalyptusPositive and negative results
2 papers in the same direction as this paper · 2 in the opposite direction
- positive
- negative
- negative
1 paper more in this group
See all 5 papers →drought · physiology: photosynthesis · EucalyptusResults agree
3 papers in the same direction as this paper
- negative
- negative
- no effect
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.