Abstract
Eucalyptus species are grown widely outside of their native ranges in plantations on all vegetated continents of the world. We predicted that such a plantation species would show high potential for acclimation of photosynthetic traits across a wide range of growth conditions, including elevated [CO2] and climate warming. To test this prediction, we planted temperate Eucalyptus globulus Labill. seedlings in climate-controlled chambers in the field located >700 km closer to the equator than the nearest natural occurrence of this species. Trees were grown in a complete factorial combination of elevated CO2 concentration (eC; ambient [CO2] +240 ppm) and air warming treatments (eT; ambient +3 °C) for 15 months until they reached ca. 10 m height. There was little acclimation of photosynthetic capacity to eC and hence the CO2-induced photosynthetic enhancement was large (ca. 50%) in this treatment during summer. The warming treatment significantly increased rates of both carboxylation capacity (V(cmax)) and electron transport (Jmax) (measured at a common temperature of 25 °C) during winter, but decreased them significantly by 20-30% in summer. The photosynthetic CO2 compensation point in the absence of dark respiration (Γ*) was relatively less sensitive to temperature in this temperate eucalypt species than for warm-season tobacco. The temperature optima for photosynthesis and Jmax significantly changed by about 6 °C between winter and summer, but without further adjustment from early to late summer. These results suggest that there is an upper limit for the photosynthetic capacity of E. globulus ssp. globulus outside its native range to acclimate to growth temperatures above 25 °C. Limitations to temperature acclimation of photosynthesis in summer may be one factor that defines climate zones where E. globulus plantation productivity can be sustained under anticipated global environmental change.
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Claims 9
Claim · model-written summary
Elevated CO2 produced little acclimation of photosynthetic capacity in Eucalyptus globulus trees.
- Taxon
- Eucalyptus globulus
Eucalyptus globuluse0 - Treatment
- elevated CO2 concentratione2
- Outcome
- acclimation of photosynthetic capacitye1
- Direction
- no_changeinferrede1
- Comparator
- ambient [CO2]e2
- Setting
- climate-controlled chambers in the fielde3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Eucalyptus globulus Labill.”
e1“There was little acclimation of photosynthetic capacity to eC”
e2“elevated CO2 concentration (eC; ambient [CO2] +240 ppm)”
e3“climate-controlled chambers in the field”
Claim · model-written summary
Elevated CO2 enhanced photosynthesis by about 50% in summer in Eucalyptus globulus trees.
- Taxon
- Eucalyptus globulusEucalyptus globuluse0
- Treatment
- elevated CO2 concentratione2
- Outcome
- CO2-induced photosynthetic enhancemente4
- Direction
- increaseinferrede4
- Value
- ca. 50%e4
- Comparator
- ambient [CO2]e2
- Setting
- summere4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Eucalyptus globulus Labill.”
e2“elevated CO2 concentration (eC; ambient [CO2] +240 ppm)”
e4“the CO2-induced photosynthetic enhancement was large (ca. 50%) in this treatment during summer”
Claim · model-written summary
Warming significantly increased carboxylation capacity and electron transport rates of Eucalyptus globulus in winter.
- Taxon
- Eucalyptus globulusEucalyptus globuluse0
- Treatment
- warming treatmente5
- Outcome
- carboxylation capacity (V(cmax)) and electron transport (Jmax)e5
- Direction
- significantly increasede5
- Qualifier
- measured at a common temperature of 25 °Ce5
- Comparator
- ambiente6
- Setting
- wintere5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Eucalyptus globulus Labill.”
e5“The warming treatment significantly increased rates of both carboxylation capacity (V(cmax)) and electron transport (Jmax) (measured at a common temperature of 25 °C) during winter”
e6“air warming treatments (eT; ambient +3 °C)”
Claim · model-written summary
Warming decreased carboxylation capacity and electron transport rates of Eucalyptus globulus by 20-30% in summer.
- Taxon
- Eucalyptus globulusEucalyptus globuluse0
- Treatment
- warming treatmente5
- Outcome
- carboxylation capacity (V(cmax)) and electron transport (Jmax)e5
- Direction
- decreasede7
- Value
- 20-30%e7
- Comparator
- ambiente6
- Setting
- summere7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Eucalyptus globulus Labill.”
e5“The warming treatment significantly increased rates of both carboxylation capacity (V(cmax)) and electron transport (Jmax) (measured at a common temperature of 25 °C) during winter”
e6“air warming treatments (eT; ambient +3 °C)”
e7“but decreased them significantly by 20-30% in summer”
Claim · model-written summary
The CO2 compensation point of this temperate eucalypt was relatively less sensitive to temperature than that of warm-season tobacco.
- Taxon
- Eucalyptus globulusEucalyptus globuluse0
- Treatment
- temperaturee1
- Outcome
- photosynthetic CO2 compensation pointe1
- Direction
- less sensitivee1
- Comparator
- warm-season tobaccoe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Eucalyptus globulus Labill.”
e1“The photosynthetic CO2 compensation point in the absence of dark respiration (Γ*) was relatively less sensitive to temperature in this temperate eucalypt species than for warm-season tobacco”
Claim · model-written summary
The temperature optima for photosynthesis and Jmax changed significantly by about 6 °C between winter and summer.
- Taxon
- Eucalyptus globulusEucalyptus globuluse0
- Outcome
- temperature optima for photosynthesis and Jmaxe1
- Direction
- significantly changede1
- Value
- about 6 °Ce1
- Comparator
- wintere1
- Setting
- summere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Eucalyptus globulus Labill.”
e1“The temperature optima for photosynthesis and Jmax significantly changed by about 6 °C between winter and summer, but without further adjustment from early to late summer”
Claim · model-written summary
The temperature optima for photosynthesis and Jmax did not further adjust from early to late summer.
- Taxon
- Eucalyptus globulusEucalyptus globuluse0
- Outcome
- temperature optima for photosynthesis and Jmaxe1
- Direction
- no_changeinferrede1
- Setting
- from early to late summere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Eucalyptus globulus Labill.”
e1“The temperature optima for photosynthesis and Jmax significantly changed by about 6 °C between winter and summer, but without further adjustment from early to late summer”
Claim · model-written summary
The authors suggest an upper limit for the photosynthetic capacity of E. globulus ssp. globulus outside its native range to acclimate to growth temperatures above 25 °C.
- Taxon
- E. globulus ssp. globulus
Eucalyptus globulus subsp. globuluse1 - Outcome
- upper limit for the photosynthetic capacitye1
- Qualifier
- to acclimate to growth temperatures above 25 °Ce1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“These results suggest that there is an upper limit for the photosynthetic capacity of E. globulus ssp. globulus outside its native range to acclimate to growth temperatures above 25 °C”
Claim · model-written summary
Limited temperature acclimation of photosynthesis in summer may help define climate zones where E. globulus plantation productivity can be sustained.
- Taxon
- E. globulusEucalyptus globuluse0
- Outcome
- plantation productivitye0
- Qualifier
- Limitations to temperature acclimation of photosynthesis in summere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Limitations to temperature acclimation of photosynthesis in summer may be one factor that defines climate zones where E. globulus plantation productivity can be sustained under anticipated global environmental change”
The same questions in other papers
heat · physiology: photosynthesis · Eucalyptus globulus (blue gum)Positive and negative results
1 in the opposite direction
- negative
co2 · physiology: photosynthesis · Eucalyptus globulus (blue gum)Results agree
2 papers in the same direction as this paper
- positive
- 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.