Photosynthesis, stomatal conductance and terpene emission response to water availability in dry and mesic Mediterranean forests
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Warmer summer conditions result in increased terpene emissions except under severe drought, in which case they strongly decrease.
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.
KeywordsMediterranean drought conditions Terpene emission rates Gas interchange Pinus halepensis Quercus calliprinos Quercus ithaburensis
This study was supported by the Spanish Government Grant CGL2013-48074-P, the Catalan Government grant SGR 2014-274, the European Research Council Synergy grant ERC-2013-SyG 610028 IMBALANCE-P, and the Air Liquide Foundation AirLiCOVs grant. Roger Seco was partially supported by a postdoctoral grant awarded by Fundación Ramón Areces. This work was supported by the Cathy Wills and Robert Lewis Program in Environmental Science, the KKL-JNF, and the Sussman Center of the Weizmann Institute of Science.
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Conflict of interest
The authors declare that they have no conflict of interest.
- Aschmann H (1973a) Distribution and peculiarity of mediterranean ecosystems. In: Di Castri F, Mooney HA (eds) Mediterranean type ecosistems: originand structure. Springer-Verlag, New York, p 405Google Scholar
- Aschmann H (1973b) Man’s impact on theseveral regions with mediterranean climates. In: Di Castri F, Mooney HA (eds) Mediterranean type ecosistems: originand structure. Springer-Verlag, New YorkGoogle Scholar
- Blanch S, Sampedro L, Llusia J, Moreira X, Zas R, Peñuelas J (2012) Effects of phosphorus availability and genetic variation of leaf terpene content and emission rate in Pinus pinaster seedlings susceptible and resistant to the pine weevil, Hylobius abietis. Plant Biol 14:66–72CrossRefPubMedGoogle Scholar
- Gratani L (2014) Plant phenotypic plasticity in response to environmental factors. Advances in botany, v 2014, Article ID 208747, 17 pages. doi: 10.1155/2014/208747
- Llusia J, Peñuelas J (1998) Changes in terpene content and emission in potted Mediterranean woody plants under severe drought. Can J Bot 76:1366–1373Google Scholar
- Ormeño E, Mévy JP, Vila B, Bousquet-Mélou A, Greff S, Bonin G, Fernandez C (2007) Water deficit stress induces different monoterpene and sesquiterpene emission changes in Mediterranean species. Relationship between terpene emissions and plant water potential. Chemosphere 67:276–284CrossRefPubMedGoogle Scholar
- Plaza J, Núñez L, Pujadas M, Pérez-Pastor R, Bermejo V, García-Alonso S, Elvira S (2005) Field monoterpene emission of Mediterranean oak (Quercus ilex) in the central Iberian Peninsula measured by enclosure and micrometeorological techniques: observation of drought stress effect. J Geophys Res 110:D03303. doi: 10.1029/2004JD005168 CrossRefGoogle Scholar
- Porcar-Castell A, Peñuelas J, Owen SM, Llusia J, Munné-Bosch S, Bäck J (2009) Leaf carotenoid concentrations and monoterpene emission capacity under acclimation of the light reactions of photosynthesis. Boreal Environ Res 14:794–806Google Scholar
- Schiller G, Conkle MT, Grunwald C (1986) Local differentiation among Mediterranean populations of Aleppo pine in their isoenzymes. Silvae Genet 35:11–19Google Scholar
- Seufert G (1997) BEMA: a European commission project on biogenic emissions in the Mediterranean area. In: Seufert G (ed) Atmospheric environment vol 31, pp 1–255Google Scholar
- Staudt M, Mandl N, Joffre R, Rambal S (2001) Intraspecific variability of monoterpene composition emitted by Quercus ilex leaves. Can J For Res 31:174–180Google Scholar
- Welter S, Bracho-Nuñez A, Mir C, Zimmer I, Kesselmeier J, Lumaret R, Schnitzler J-P, Staudt M (2012) The diversification of terpene emissions in Mediterranean oaks: lessons from a study of Quercus suber, Quercus canariensis and its hybrid Quercus afares. Tree Physiol 00:1–10. doi: 10.1093/treephys/tps069 Google Scholar
- Zohary M (1973) Geobotanical foundations to the middle east and adjacent areas. Fisher Verlag, StuttgartGoogle Scholar