Scarce population genetic differentiation but substantial spatiotemporal phenotypic variation of water-use efficiency in Pinus sylvestris at its western distribution range

Water and carbon fluxes in forests are largely related to leaf gas exchange physiology varying across spatiotemporal scales and modulated by plant responses to environmental cues. We quantified the relevance of genetic and phenotypic variation of intrinsic water-use efficiency (WUE i , ratio of net...

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Bibliographic Details
Published in:European journal of forest research 2018-12, Vol.137 (6), p.863-878
Main Authors: Santini, F., Ferrio, J. P., Hereş, A.-M., Notivol, E., Piqué, M., Serrano, L., Shestakova, T. A., Sin, E., Vericat, P., Voltas, J.
Format: Article
Language:English
Subjects:
Biomedical and Life Sciences
Carbon
Carbon isotopes
Conductance
Differentiation
Ecosystems
Evergreen trees
Fluxes
Forestry
Gas exchange
Genetic diversity
Genetic variance
Isotopes
Leaves
Life Sciences
Moisture content
Original Paper
Phenotypic variations
Photosynthesis
Pine trees
Pinus sylvestris
Plant Ecology
Plant Sciences
Population genetics
Remote sensing
Resistance
Soil depth
Soil water
Spatial distribution
Stomata
Stomatal conductance
Tree rings
Water resources
Water use
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Summary:Water and carbon fluxes in forests are largely related to leaf gas exchange physiology varying across spatiotemporal scales and modulated by plant responses to environmental cues. We quantified the relevance of genetic and phenotypic variation of intrinsic water-use efficiency (WUE i , ratio of net photosynthesis to stomatal conductance of water) in Pinus sylvestris L. growing in the Iberian Peninsula as inferred from tree-ring carbon isotopes. Inter-population genetic variation, evaluated in a provenance trial comprising Spanish and German populations, was low and relevant only at continental scale. In contrast, phenotypic variation, evaluated in natural stands (at spatial level) and by tree-ring chronologies (at temporal inter-annual level), was important and ten- and threefold larger than the population genetic variance, respectively. These results points to preponderance of plastic responses dominating variability in WUE i for this species. Spatial phenotypic variation in WUE i correlated negatively with soil depth ( r  = − 0.66; p 
ISSN:1612-4669
1612-4677
DOI:10.1007/s10342-018-1145-9