NDLI: Comparative Field Summer Stress of Three Tree Species Co-occurring in Mediterranean Coastal Dunes

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Comparative Field Summer Stress of Three Tree Species Co-occurring in Mediterranean Coastal Dunes

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Comparative Field Summer Stress of Three Tree Species Co-occurring in Mediterranean Coastal Dunes

Content Provider	Springer Nature Link
Author	Castillo, J.M. Casal, A.E. Rubio Luque, C.J. Luque, T. Figueroa, M.E.
Copyright Year	2002
Abstract	Chlorophyll a fluorescence, water potential (Ψ$_{s}$), and root system of Juniperus oxycedrus ssp. macrocarpa, Juniperus phoenicea ssp. turbinata, and Pinus pinea were studied in Mediterranean coastal dunes of SW Spain during summer drought and after fall rains in 1999, the driest year in the 90's. A strong and reversible depression in the photochemical efficiency of photosystem 2 of the three species was recorded, which happened concomitantly with the diurnal increase and decrease in radiation. J. phoenicea, with superficial root system, was the most affected species by summer drought. It showed high rates of down-regulation of photosynthesis by photoinhibition and positive correlation between Ψ$_{s}$ and F$_{v}$/F$_{p}$, with Ψ$_{s}$ lower than -7 MPa. However, it tolerated this high stress, showing a fast recovery of its physiological state after fall rains. On the other hand, J. oxycedrus and P. pinea, both with deep root systems, kept their Ψ$_{s}$ values up to -3 MPa, showing lower stress during summer drought. On the other hand, J. oxycedrus and J. phoenicea were more sensible to changes in edaphic water content than P. pinea. These specific responses to summer drought would be determined by their root distributions and stomatal control of transpiration, conditioning the efficiency in getting and using the available water resources. Ecophysiological responses indicate that these species are well-adapted to long periods of drought in Mediterranean climate areas, developing different strategies: J. phoenicea tolerates high stress with a fast recovery after fall rains, while J. oxycedrus and P. pinea are less affected by summer drought since their deep root systems would allow them to reach deep water resources.
Starting Page	49
Ending Page	56
Page Count	8
File Format	PDF
ISSN	03003604
Journal	Photosynthetica
Volume Number	40
Issue Number	1
e-ISSN	15739058
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2002-01-01
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science

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