Marcos Fernández-Martínez1,2,3, Joan Llusià2,3, Iolanda Filella2,3, Ülo Niinemets4,5, Almut Arneth6, Ian J Wright7, Francesco Loreto8, Josep Peñuelas2,3. 1. Centre of Excellence PLECO (Plant and Vegetation Ecology), Department of Biology, University of Antwerp, Wilrijk, 2610, Belgium. 2. CSIC, Global Ecology Unit, CREAF-CEAB-CSIC-UAB, Bellaterra, Barcelona, Catalonia, 08193, Spain. 3. CREAF, Cerdanyola del Vallès, Barcelona, Catalonia, 08193, Spain. 4. Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, 1 Kreutzwaldi, Tartu, 51014, Estonia. 5. Estonian Academy of Sciences, Kohtu 6, Tallinn, 10130, Estonia. 6. Karlsruhe Institute of Technology, Atmospheric Environmental Research, Kreuzeckbahnstr. 19, Garmisch-Partenkirchen, 82467, Germany. 7. Department of Biological Sciences, Macquarie University, Sydney, NSW, 2109, Australia. 8. Department of Biology, Agriculture and Food Sciences (CNR-DISBA), National Research Council of Italy, Piazzale Aldo Moro 7, Rome, Italy.
Abstract
The emission of isoprenoids (e.g. isoprene and monoterpenes) by plants plays an important defensive role against biotic and abiotic stresses. Little is known, however, about the functional traits linked to species-specific variability in the types and rates of isoprenoids emitted and about possible co-evolution of functional traits with isoprenoid emission type (isoprene emitter, monoterpene emitter or both). We combined data for isoprene and monoterpene emission rates per unit dry mass with key functional traits (foliar nitrogen (N) and phosphorus (P) concentrations, and leaf mass per area) and climate for 113 plant species, covering the boreal, wet temperate, Mediterranean and tropical biomes. Foliar N was positively correlated with isoprene emission, and foliar P was negatively correlated with both isoprene and monoterpene emission rate. Nonemitting plants generally had the highest nutrient concentrations, and those storing monoterpenes had the lowest concentrations. Our phylogenetic analyses found that the type of isoprenoid emission followed an adaptive, rather than a random model of evolution. Evolution of isoprenoids may be linked to nutrient availability. Foliar N and P are good predictors of the type of isoprenoid emission and the rate at which monoterpenes, and to a lesser extent isoprene, are emitted.
The emission of n class="Chemical">isoprenoids (e.g. pan> class="Chemical">isoprene and monoterpenes) by plants plays an important defensive role against biotic and abiotic stresses. Little is known, however, about the functional traits linked to species-specific variability in the types and rates of isoprenoids emitted and about possible co-evolution of functional traits with isoprenoid emission type (isoprene emitter, monoterpene emitter or both). We combined data for isoprene and monoterpene emission rates per unit dry mass with key functional traits (foliar nitrogen (N) and phosphorus (P) concentrations, and leaf mass per area) and climate for 113 plant species, covering the boreal, wet temperate, Mediterranean and tropical biomes. Foliar N was positively correlated with isoprene emission, and foliar P was negatively correlated with both isoprene and monoterpene emission rate. Nonemitting plants generally had the highest nutrient concentrations, and those storing monoterpenes had the lowest concentrations. Our phylogenetic analyses found that the type of isoprenoid emission followed an adaptive, rather than a random model of evolution. Evolution of isoprenoids may be linked to nutrient availability. Foliar N and P are good predictors of the type of isoprenoid emission and the rate at which monoterpenes, and to a lesser extent isoprene, are emitted.
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