Drought tolerance in the Mediterranean species <Emphasis Type="Italic">Quercus coccifera,Quercus ilex,Pinus halepensis</Emphasis>, and <Emphasis Type="Italic">Juniperus phoenicea</Emphasis> |
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Authors: | F J Baquedano FJ Castillo |
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Institution: | (1) Departamento de Ciencias del Medio Natural, Universidad Pública de Navarra, E-31006 Pamplona, Spain;(2) School of Plant Biology, The University of Western Australia, 6009 Crawley, Australia |
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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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Keywords: | carotenoids chlorophyll fluorescence field conditions net photosynthetic rate photosystem 2 precipitation quantum yield stomatal conductance transpiration water potential |
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