Work

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

Year: 2018

Type: article

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-1/25Â°C (AC); 360 μmol(CO2) mol-1/4Â°C (AC+LT); 700 μmol(CO2) mol-1/25Â°C (EC); 700 μmol(CO2) mol-1/4Â°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.

Source: Photosynthetica

DOI: 10.1007/s11099-018-0843-3

Authors: C. Arena, L. Vitale

Institutions: National Research Council, Institute for Agricultural and Forest Systems in the Mediterranean, University of Naples Federico II

Language: English

Topic: Plant responses to elevated CO2

Subfield: Plant Science

Field: Agricultural and Biological Sciences

Domain: Life Sciences

SDG: Climate action

Open Access status: bronze

OpenAlex ID: W2809417341