Abstract
Two genotypes of Capsicum annuum L. were cold-hardened at sub-optimal temperature (14℃) and an irradiance of 250 μmol m -2 s -1 for 5 d. The responses of photosynthetic characteristics and particularly the chlorophyll fluorescence parameters to low temperature in cold-hardened leaves (HL) and unhardened leaves (UHL) were investigated with a CIRAS-1 photosynthetic analyzer and a FMS2 fluorometer under controlled light intensity and temperature. Along with the decreasing temperature, the carboxylation efficiency, the photosynthetic rate of light saturation and the saturating light intensity of CO 2 fixation in sweet pepper leaves decreased, irrespective of varietal difference and cold-hardening. However, the apparent quantum yield of photosynthesis was less affected by the decrease in temperature, indicating that low temperature had less influence on the process of light reaction than carbon assimilation. The enhancement of light energy utilization due to strengthened carbon dioxide fixation by elevated CO 2 concentrations was able to relieve the chilling-induced photoinhibition. Nevertheless, as temperature was lowered to 8℃, the relief effects of enhancing CO 2 concentration became less significant. The photochemical efficiency of photosystem II (Ф PSII),photochemical quenching of fluorescence (q P) and the efficiency of excitation energy capture by open photosystem II reaction centres (Fv′/Fm′) were lower in HL than in UHL at 25℃, suggesting that photoinhibition occurred during cold-hardening. But cold-hardened leaves could maintain higher values of Ф PSII, q P and Fv′/Fm′ under low temperature, implying that they faced lesser excitation energy pressure. Cold hardening enhanced the resistance to chilling-induced photoinhibition of both two cultivars. However, the effects of cold hardening were more pronounced in cold-tolerant cultivar.
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Claims 8
Claim · model-written summary
Decreasing temperature reduced carboxylation efficiency, light saturated photosynthesis and saturating light intensity.
- Taxon
- sweet pepper
Capsicum annuume0 - Treatment
- decreasing temperaturee0
- Outcome
- carboxylation efficiency, the photosynthetic rate of light saturation and the saturating light intensity of CO 2 fixatione0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Along with the decreasing temperature, the carboxylation efficiency, the photosynthetic rate of light saturation and the saturating light intensity of CO 2 fixation in sweet pepper leaves decreased, irrespective of varietal difference and cold-hardening.”
Claim · model-written summary
Apparent quantum yield was less affected by lower temperature.
- Taxon
- Sweet PepperCapsicum annuumt0
- Treatment
- decrease in temperaturee0
- Outcome
- apparent quantum yield of photosynthesise0
- Direction
- less affectede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sweet Pepper Leaves”
e0“the apparent quantum yield of photosynthesis was less affected by the decrease in temperature”
Claim · model-written summary
Elevated CO2 relieved chilling induced photoinhibition through enhanced carbon fixation and light energy use.
- Taxon
- Sweet PepperCapsicum annuumt0
- Treatment
- elevated CO 2 concentrationse0
- Outcome
- chilling-induced photoinhibitione0
- Qualifier
- strengthened carbon dioxide fixatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sweet Pepper Leaves”
e0“The enhancement of light energy utilization due to strengthened carbon dioxide fixation by elevated CO 2 concentrations was able to relieve the chilling-induced photoinhibition.”
Claim · model-written summary
CO2 relief of photoinhibition weakened at 8℃.
- Taxon
- Sweet PepperCapsicum annuumt0
- Outcome
- relief effects of enhancing CO 2 concentratione0
- Direction
- less significante0
- Qualifier
- 8℃e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sweet Pepper Leaves”
e0“as temperature was lowered to 8℃, the relief effects of enhancing CO 2 concentration became less significant.”
Claim · model-written summary
At 25℃, hardened leaves had lower PSII efficiency, quenching and excitation capture than unhardened leaves.
- Taxon
- Sweet PepperCapsicum annuumt0
- Treatment
- HLe0
- Outcome
- photochemical efficiency of photosystem II (Ф PSII),photochemical quenching of fluorescence (q P) and the efficiency of excitation energy capture by open photosystem II reaction centres (Fv′/Fm′)e0
- Direction
- lowere0
- Qualifier
- 25℃e0
- Comparator
- UHLe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sweet Pepper Leaves”
e0“The photochemical efficiency of photosystem II (Ф PSII),photochemical quenching of fluorescence (q P) and the efficiency of excitation energy capture by open photosystem II reaction centres (Fv′/Fm′) were lower in HL than in UHL at 25℃”
Claim · model-written summary
At low temperature, hardened leaves maintained higher PSII efficiency, quenching and excitation capture.
- Taxon
- Sweet PepperCapsicum annuumt0
- Outcome
- Ф PSII, q P and Fv′/Fm′e0
- Direction
- highere0
- Qualifier
- low temperaturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sweet Pepper Leaves”
e0“cold-hardened leaves could maintain higher values of Ф PSII, q P and Fv′/Fm′ under low temperature”
Claim · model-written summary
Cold hardening improved resistance to chilling induced photoinhibition in both cultivars.
- Taxon
- Sweet PepperCapsicum annuumt0
- Treatment
- Cold hardeninge0
- Outcome
- resistance to chilling-induced photoinhibitione0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sweet Pepper Leaves”
e0“Cold hardening enhanced the resistance to chilling-induced photoinhibition of both two cultivars.”
Claim · model-written summary
Cold hardening effects were stronger in the cold tolerant cultivar.
- Taxon
- Sweet PepperCapsicum annuumt0
- Material
- cold-tolerant cultivare0
- Outcome
- effects of cold hardeninge0
- Direction
- more pronouncede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sweet Pepper Leaves”
e0“the effects of cold hardening were more pronounced in cold-tolerant cultivar.”
The same questions in other papers
cold · physiology: photosynthesis · Capsicum annuum (sweet pepper)Positive and negative results
1 paper in the same direction as this paper · 4 in the opposite direction
- no effect
- negative
- negative
2 papers more in this group
See all 6 papers →in vitro · physiology: photosynthesis · Capsicum annuum (sweet pepper)Results agree
1 paper in the same direction as this paper
- 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.