Photosynthetica 2018, 56(4):1259-1267 | DOI: 10.1007/s11099-018-0843-3

Chilling-induced reduction of photosynthesis is mitigated by exposure to elevated CO2 concentrations

C. Arena1,*, L. Vitale2
1 Department of Biology, University of Naples Federico II, Naples, Italy
2 Institute for Agricultural and Forestry Systems in the Mediterranean (ISAFoM), Department of Biology, Agriculture and Food Sciences (DiSBA), National Research Council (CNR), Ercolano, Italy

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.

Keywords: chilling; elevated CO2; partitioning of absorbed light to PSII; photosynthetic rate

Received: August 4, 2017; Accepted: January 3, 2018; Prepublished online: December 1, 2018; Published: November 1, 2018Show citation

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Arena, C., & Vitale, L. (2018). Chilling-induced reduction of photosynthesis is mitigated by exposure to elevated CO2 concentrations. Photosynthetica, 56(4), 1259-1267. doi: 10.1007/s11099-018-0843-3.
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