Abstract
This work aimed to evaluate if chilling stress may be mitigated by elevated CO2 (EC) in Beta vulgaris L. plants. Photosynthetic rate was measured at 21% and 2% O2 after a short-term exposure of 5 h at four different treatments: 360 μmol(CO2) mol–1/25°C (AC); 360 μmol(CO2) mol–1/4°C (AC+LT); 700 μmol(CO2) mol–1/25°C (EC); 700 μmol(CO2) mol–1/4°C (EC+LT). Compared to AC+LT, EC+LT plants showed higher values of CO2 fixation, photochemical activity, and Rubisco amount. These latter invest a higher portion of photosynthetic electron flow to O2, differently from AC+LT plants that promote the regulated thermal dissipation processes. In EC+LT plants, the photosynthetic electron flow to O2 acts as a safety mechanism against the excess of absorbed light, upon return to prechilling conditions, allowing photosynthetic apparatus to maintain its efficiency. In AC+LT plants, the increase of thermal dissipation processes was not adequate to guarantee the PSII photoprotection and the photosynthetic recovery after chilling.
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Abbreviations
- AC:
-
ambient [CO2]
- [CO2]:
-
CO2 concentration
- Chl:
-
chlorophyll
- C i :
-
intercellular CO2 concentration
- EC:
-
elevated [CO2]
- F0 :
-
minimal fluorescence yield of the dark-adapted state
- F0’ :
-
minimal fluorescence yield of the light-adapted state
- Fm :
-
maximal fluorescent yield of the dark-adapted state
- Fm’ :
-
maximal fluorescence level in light-adapted state
- Fv :
-
variable fluorescence
- Fv/Fm :
-
maximum quantum yield of PSII photochemistry
- Fs :
-
steady-state fluorescence yield
- gs:
-
stomatal conductance
- Jf :
-
electron transport rate
- Jc :
-
electron transport rate used for CO2 assimilation
- Jo :
-
electron transport rate used for photorespiration
- K:
-
Kelvin
- LT:
-
low temperature
- P N :
-
net photosynthetic rate
- RD:
-
dark respiration
- TCA:
-
trichloroacetic acid
- Vc :
-
carboxylation rate of Rubisco
- Vo :
-
oxygenation rate of Rubisco
- ΦPSII :
-
effective quantum yield of PSII photochemistry
- FNPQ:
-
the yield of regulated energy dissipation
- FNO:
-
the yield of nonregulated energy dissipation
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Arena, C., Vitale, L. Chilling-induced reduction of photosynthesis is mitigated by exposure to elevated CO2 concentrations. Photosynthetica 56, 1259–1267 (2018). https://doi.org/10.1007/s11099-018-0843-3
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DOI: https://doi.org/10.1007/s11099-018-0843-3