Abstract
Quercus ilex plants grown on two different substrates, sand soil (C) and compost (CG), were exposed to photosynthetic photon flux densities (PPFD) at 390 and 800 µmol(CO2) mol−1 (C390 and C800). At C800 both C and CG plants showed a significant increase of net photosynthetic rate (P N) and electron transport rate (ETR) in response to PPFD increase as compared to C390. In addition, at C800 lower non-photochemical quenching (NPQ) values were observed. The differences between C390 and C800 were related to PPFD. The higher P N and ETR and the lower dissipative processes found in CG plants at both CO2 concentrations as compared to C plants suggest that substrate influences significantly photosynthetic response of Q. ilex plants. Moreover, short-term exposures at elevated CO2 decreased nitrate photo-assimilation in leaves independently from substrate of growth.
Abbreviations
- AQF :
-
ratio of net CO2 assimilation to gross rate of O2 evolution from chlorophyll fluorescence
- C:
-
control plants
- C i/C a :
-
ratio of intercellular to ambient CO2 concentration
- CEC:
-
cation exchange capacity
- CG:
-
compost grown plants
- Chl:
-
chlorophyll
- EC:
-
elevated CO2 concentration
- ETR:
-
electron transport rate
- ETRO2 :
-
the gross rate of O2 evolution from chlorophyll fluorescence
- F0 :
-
background fluorescence
- Fm′:
-
maximal fluorescence of closed PS2 reaction centres in the light-adapted state
- Fm :
-
maximal fluorescence of closed PS2 reaction centres in the dark-adapted state
- Ft :
-
steady-state fluorescence signal in the light-adapted state
- Fv/Fm :
-
maximum photochemical efficiency of PS2
- NPQ:
-
non-photochemical quenching
- N-NO3 − :
-
nitrate content
- P N :
-
net photosynthetic rate
- PPFD:
-
photosynthetic photon flux density
- PS2:
-
photosystem 2
- RuBPCO:
-
ribulose-1,5-bisphosphate carboxylase/oxygenase
- ΦPS2 :
-
quantum yield of electron transport
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Arena, C., Vitale, L. & Virzo De Santo, A. Photosynthetic response of Quercus ilex L. plants grown on compost and exposed to increasing photon flux densities and elevated CO2 . Photosynthetica 43, 615–619 (2005). https://doi.org/10.1007/s11099-005-0096-9
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DOI: https://doi.org/10.1007/s11099-005-0096-9