Abstract
The mechanistic bases of thermal acclimation of net photosynthetic rate (An) are still difficult to discern, and the data sets available are scarce, particularly for hybrid poplar. In the present study, we examined the contribution of a number of biochemical and biophysical traits on thermal acclimation of An for two hybrid poplar clones. We grew cuttings of Populus maximowiczii × Populus nigra (M×N) and Populus maximowiczii × Populus balsamifera (M×B) clones under two day/night temperature of 23°C/18°C and 33°C /27°C and under low and high soil nitrogen level. After ten weeks, we measured leaf RuBisCO (RAR) and RuBisCO activase (RARCA) amounts and the temperature response of An, dark respiration (Rd), stomatal conductance, (gs), apparent maximum carboxylation rate of CO2 (Vcmax) and apparent photosynthetic electron transport rate (J). Results showed that a 10°C increase in growth temperature resulted in a shift in thermal optimum (Topt) of An of 6.2±1.6°C and 8.0±1.2°C for clone M×B and M×N respectively, and an increased An and gs at the growth temperature for clone M×B but not M×N. RuBisCO amount was increased by N level but was insensitive to growth temperature while RARCA amount and the ratio of its short to long isoform was stimulated by the warm condition for clone M×N and at low N for clone M×B. The activation energy of apparent Vcmax and apparent J decreased under the warm condition for clone M×B and remained unchanged for clone M×N. Our study demonstrated the involvement of both RARCA, the activation energy of apparent Vcmax and stomatal conductance in thermal acclimation of An.
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Claims 11
Claim · model-written summary
A 10°C rise in growth temperature shifted the photosynthetic thermal optimum by 6.2±1.6°C in M×B.
- Material
- M×Be0
- Treatment
- 10°C increase in growth temperaturee0
- Outcome
- thermal optimum (Topt) of Ane0
- Direction
- shifte0
- Value
- 6.2±1.6°Ce0
PopulusNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a 10°C increase in growth temperature resulted in a shift in thermal optimum (Topt) of An of 6.2±1.6°C and 8.0±1.2°C for clone M×B and M×N respectively”
t0“hybrid poplar”
Claim · model-written summary
A 10°C rise in growth temperature shifted the photosynthetic thermal optimum by 8.0±1.2°C in M×N.
- Material
- M×Ne0
- Treatment
- 10°C increase in growth temperaturee0
- Outcome
- thermal optimum (Topt) of Ane0
- Direction
- shifte0
- Value
- 8.0±1.2°Ce0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a 10°C increase in growth temperature resulted in a shift in thermal optimum (Topt) of An of 6.2±1.6°C and 8.0±1.2°C for clone M×B and M×N respectively”
t0“hybrid poplar”
Claim · model-written summary
Warmer growth increased An and gs at growth temperature in M×B.
- Material
- M×Be0
- Treatment
- 10°C increase in growth temperaturee1
- Outcome
- An and gse0
- Direction
- increasede0
- Qualifier
- at the growth temperaturee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an increased An and gs at the growth temperature for clone M×B but not M×N”
e1“a 10°C increase in growth temperature”
t0“hybrid poplar”
Claim · model-written summary
Warmer growth did not increase An or gs at growth temperature in M×N.
- Material
- M×Ne0
- Treatment
- 10°C increase in growth temperaturee1
- Outcome
- An and gse0
- Direction
- not M×Ne0
- Qualifier
- at the growth temperaturee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an increased An and gs at the growth temperature for clone M×B but not M×N”
e1“a 10°C increase in growth temperature”
t0“hybrid poplar”
Claim · model-written summary
Higher nitrogen increased RuBisCO amount.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“RuBisCO amount was increased by N level”
t0“hybrid poplar”
Claim · model-written summary
RuBisCO amount was insensitive to growth temperature.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“RuBisCO amount was increased by N level but was insensitive to growth temperature”
t0“hybrid poplar”
Claim · model-written summary
Warm conditions stimulated RARCA amount and its short-to-long isoform ratio in M×N.
- Material
- M×Ne0
- Treatment
- warm conditione0
- Gene
- RARCAe0
- Outcome
- RARCA amount and the ratio of its short to long isoforme0
- Direction
- stimulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“RARCA amount and the ratio of its short to long isoform was stimulated by the warm condition for clone M×N”
t0“hybrid poplar”
Claim · model-written summary
At low nitrogen, RARCA amount and its short-to-long isoform ratio were stimulated in M×B.
- Material
- M×Be0
- Treatment
- low Ne0
- Gene
- RARCAe0
- Outcome
- RARCA amount and the ratio of its short to long isoforme0
- Direction
- stimulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“RARCA amount and the ratio of its short to long isoform was stimulated by the warm condition for clone M×N and at low N for clone M×B”
t0“hybrid poplar”
Claim · model-written summary
Warm conditions decreased activation energy of apparent Vcmax and apparent J in M×B.
- Material
- M×Be0
- Treatment
- warm conditione0
- Outcome
- activation energy of apparent Vcmax and apparent Je0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activation energy of apparent Vcmax and apparent J decreased under the warm condition for clone M×B”
t0“hybrid poplar”
Claim · model-written summary
Activation energy of apparent Vcmax and apparent J remained unchanged under warm conditions in M×N.
- Material
- M×Ne0
- Treatment
- warm conditione0
- Outcome
- activation energy of apparent Vcmax and apparent Je0
- Direction
- remained unchangede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activation energy of apparent Vcmax and apparent J decreased under the warm condition for clone M×B and remained unchanged for clone M×N”
t0“hybrid poplar”
Claim · model-written summary
The authors conclude that RARCA, apparent Vcmax activation energy, and stomatal conductance contribute to thermal acclimation of An.
- Gene
- RARCAe0
- Outcome
- thermal acclimation of Ane0
- Qualifier
- activation energy of apparent Vcmax and stomatal conductancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Our study demonstrated the involvement of both RARCA, the activation energy of apparent Vcmax and stomatal conductance in thermal acclimation of An.”
t0“hybrid poplar”
The same questions in other papers
nitrogen · physiology: photosynthesis · Populus (poplar)Results agree
3 papers in the same direction as this paper
- positive
- 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.