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Linking morphological and ecophysiological leaf traits to canopy dieback in Persian oak trees from central Zagros

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Abstract

Intraspecific variability in morphological and ecophysiological leaf traits might be theorized to be present in declining populations, since they seem to be exposed to stress and plasticity could be advantageous. Here we focused on declining Persian oaks (Quercus brantii Lindl. var. persica (Jaub and Spach) Zohary) in the Zagros Mountains of western Iran, representing the most important tree species of this region. We selected trees with contrasting crown dieback, from healthy to severely defoliated, to investigate the relationships between canopy dieback and leaf morphology, water content and pigments. We also measured esterase and peroxidase, as enzymatic antioxidants and indicators of contrasting genotypes. Trees showing moderate to severe defoliation showed higher leaf mass area (LMA), reduced relative water content (RWC), and lower stomatal density (SD). Increasing LMA indicates a more sclerophyllic structure, according to drier conditions. We did not find significant differences in leaf pigments (chlorophyll a and b, and carotenoids) among crown dieback classes, suggesting that Persian oak trees are able to maintain accurate photochemical efficiency, while reduced RWC and SD suggest hydraulic limitations. Our results do not provide a consistent pattern as regards enzymatic antioxidant defense in Persian oak. Morphological leaf traits would be important drivers of future adaptive evolution in Persian oak, leading to smaller and thicker leaves, which have fitness benefits in dry environments. Nonetheless, drought responses may be critically affecting carbon uptake, as photosynthetic compounds are less effectively used in leaves with higher sclerophylly.

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Correspondence to Ahmad Hosseini.

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Project funding: Ministerio de Economía y Competitividad, Spain (CGL2013-48843-C2-2-R); European Union FEDER 0087 (TRANSHABITAT); Tarbiat Modares University (Doctorate support to AH).

The online version is available at http://www.springerlink.com

Corresponding editor: Hu Yanbo.

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Hosseini, A., Hosseini, S.M. & Linares, J.C. Linking morphological and ecophysiological leaf traits to canopy dieback in Persian oak trees from central Zagros. J. For. Res. 30, 1755–1764 (2019). https://doi.org/10.1007/s11676-018-0805-4

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  • DOI: https://doi.org/10.1007/s11676-018-0805-4

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