NDLI: Influence of irradiance on photosynthesis and PSII photochemical efficiency in maize during short-term exposure at high CO$

Content Provider	Springer Nature Link
Author	Arena, C. Vitale, L. Santo, A. Virzo
Copyright Year	2011
Abstract	This work aimed to evaluate if gas exchange and PSII photochemical activity in maize are affected by different irradiance levels during short-term exposure to elevated CO$_{2}$. For this purpose gas exchange and chlorophyll a fluorescence were measured on maize plants grown at ambient CO$_{2}$ concentration (control CO$_{2}$) and exposed for 4 h to short-term treatments at 800 μmol(CO$_{2}$) mol$^{−1}$ (high CO$_{2}$) at a photosynthetic photon flux density (PPFD) of either 1,000 μmol m$^{−2}$ s$^{−1}$ (control light) or 1,900 μmol m$^{−2}$ s$^{−1}$ (high light). At control light, high-CO$_{2}$ leaves showed a significant decrease of net photosynthetic rate (P $_{N}$) and a rise in the ratio of intercellular to ambient CO$_{2}$ concentration (C $_{i}$/C $_{a}$) and water-use efficiency (WUE) compared to control CO$_{2}$ leaves. No difference between CO$_{2}$ concentrations for PSII effective photochemistry (Φ$_{PSII}$), photochemical quenching (q$_{p}$) and nonphotochemical quenching (NPQ) was detected. Under high light, high-CO$_{2}$ leaves did not differ in P $_{N}$, C $_{i}$/C $_{a}$, Φ$_{PSII}$ and NPQ, but showed an increase of WUE. These results suggest that at control light photosynthetic apparatus is negatively affected by high CO$_{2}$ concentration in terms of carbon gain by limitations in photosynthetic dark reaction rather than in photochemistry. At high light, the elevated CO$_{2}$ concentration did not promote an increase of photosynthesis and photochemistry but only an improvement of water balance due to increased WUE.
Starting Page	267
Ending Page	274
Page Count	8
File Format	PDF
ISSN	03003604
Journal	Photosynthetica
Volume Number	49
Issue Number	2
e-ISSN	15739058
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-06-21
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science

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