Photosynthesis, stomatal conductance and terpene emission response to water availability in dry and mesic Mediterranean forests
Llusià Benet, Joan (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Roahtyn, Shani (Weizmann Instiute of Science. Depatment of Earth and Planetary Sciences)
Yakir, Dan (Weizmann Instiute of Science. Depatment of Earth and Planetary Sciences)
Rotenberg, Eyal (Weizmann Instiute of Science. Depatment of Earth and Planetary Sciences)
Seco, Roger (University of California. Department of Earth System Science)
Guenther, Alex (Washington State University. Department of Civil and Environmental Engineering)
Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)

Data:	2016
Resum:	Water stress results in a reduction of the metabolism of plants and in a reorganization of their use of resources geared to survival. In the Mediterranean region, periods of drought accompanied by high temperatures and high irradiance occur in summer. Plants have developed various mechanisms to survive in these conditions by resisting, tolerating or preventing stress. We used three typical Mediterranean tree species in Israel, Pinus halepensis L. , Quercus calliprinos and Quercus ithaburensis Webb, as models for studying some of these adaptive mechanisms. We measured their photosynthetic rates (A), stomatal conductance (g s), and terpene emission rates during spring and summer in a geophysical gradient from extremely dry to mesic from Yatir (south, arid) to Birya (north, moist) with intermediate conditions in Solelim. A and g s of P. halepensis were threefold higher in Birya than in Yatir where they remained very low both seasons. Quercus species presented 2-3-fold higher A and g s but with much more variability between seasons, especially for Q. ithaburensis with A and g s that decreased 10-30-fold from spring to summer. Terpene emission rates for pine were not different regionally in spring but they were 5-8-fold higher in Birya than in Yatir in summer (P < 0. 05). Higher emissions were also observed in Solelim for the drought resistant Q. ithaburensis (P < 0. 001) but not for Q. calliprinos. α-Pinene followed by limonene and 3-carene were the dominant terpenes. Warmer summer conditions result in increased Terpene emission rates except under severe drought, in which case they strongly decrease.
Ajuts:	European Commission 610028 Ministerio de Economía y Competitividad CGL2013-48074-P Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-274
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Mediterranean drought conditions ; Terpene emission rates ; Gas interchange ; Pinus halepensis ; Quercus calliprinos ; Quercus ithaburensis
Publicat a:	Trees, structure and function, Vol. 30, issue 3 (June 2016) , p.749-759, ISSN 0931-1890

DOI: 10.1007/s00468-015-1317-x

Postprint 24 p, 592.7 KB

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Documents de recerca > Documents dels grups de recerca de la UAB > Centres i grups de recerca (producció científica) > Ciències > CREAF (Centre de Recerca Ecològica i d'Aplicacions Forestals) > Imbalance-P
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