Abstract
We investigated the strategies of four co-occurring evergreen woody species Quercus ilex, Quercus coccifera, Pinus halepensis, and Juniperus phoenicea to cope with Mediterranean field conditions. For that purpose, stem water potential, gas exchange, chlorophyll (Chl) fluorescence, and Chl and carotenoid (Car) contents were examined. We recognized two stress periods along the year, winter with low precipitation and low temperatures that led to chronic photoinhibition, and summer, when drought coincided with high radiation, leading to an increase of dynamic photoinhibition and a decrease of pigment content. Summer photoprotection was related to non-photochemical energy dissipation, electron flow to alternative sinks other than photosynthesis, decrease of Chl content, and proportional increase of Car content. Water potential of trees with deep vertical roots (Q. coccifera, Q. ilex, and P. halepensis) mainly depended on precipitation, whereas water potential of trees with shallow roots (J. phoenicea) depended not only on precipitation but also on ambient temperature.
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Abbreviations
- Car:
-
carotenoid
- DM:
-
dry mass
- DMSO:
-
dimethyl sulphoxide
- E:
-
transpiration rate
- F0, Fm, and Fv :
-
minimal, maximal, and variable chlorophyll fluorescence of dark-adapted leaves, respectively
- F0′, Fm′, and Fv′:
-
minimal, maximal, and variable chlorophyll fluorescence of irradiated leaves, respectively
- FM:
-
fresh mass
- g s :
-
stomatal conductance
- P N :
-
net photosynthetic rate
- PPFD:
-
photosynthetic photon flux density
- PS2:
-
photosystem 2
- qN :
-
non-photochemical quenching
- qP :
-
photochemical quenching
- SLA:
-
specific leaf area
- ΦPS2 :
-
quantum yield of linear electron transport
- Ψws :
-
stem water potential
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Baquedano, F.J., Castillo, F. Drought tolerance in the Mediterranean species Quercus coccifera, Quercus ilex, Pinus halepensis, and Juniperus phoenicea . Photosynthetica 45, 229–238 (2007). https://doi.org/10.1007/s11099-007-0037-x
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DOI: https://doi.org/10.1007/s11099-007-0037-x