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3. Doktoritööd

Selle kollektsiooni püsiv URIhttp://hdl.handle.net/10492/2490

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Sirvi 3. Doktoritööd Märksõna "abiotic stresses" järgi

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    Uncovering the patterns of woody plants’ adaptations to tolerate multiple abiotic stresses
    (Estonian University of Life Sciences, 2025) Pavanetto, Nicola; Laanisto, Lauri (advisor); Puglielli, Giacomo (advisor); Institute of Agricultural and Environmental Sciences; Pugnaire, Francisco (opponent); Davison, John (pre-opponent)
    ABSTRACT. Identifying the ecological constraints on plants' adaptive strategies to tolerate multiple abiotic stresses is fundamental to plant ecology. Recently, a stress tolerance trade-off space (STS) was formalized, defining the limits of abiotic stress tolerance strategies of woody plants of the Northern Hemisphere. This thesis aimed to establish the STS as both a conceptual and practical tool for characterising woody plant adaptations to abiotic stress through the integration of multiple ecological dimensions, including functional traits and environmental conditions at species' habitats. To support the analysis, a new R package, funspace, was developed for multivariate trait-space analysis and visualisation. Species positions within the STS were linked to six key plant traits - plant size, wood density, seed mass, and leaf-economic traits - as well as species occurrence records with associated climatic and soil variables. Generalised additive models and clustering analyses were used to identify trait–tolerance relationships and reveal global geographic patterns of stress tolerance strategies. Distinct stress-tolerance strategies were related to contrasting plant functional trait syndromes that depended on plant functional type considered. Macroecological analyses showed that size-related traits and soil fertility were the primary determinants of drought and waterlogging/cold tolerance strategies, whereas climatic factors primarily shaped shade tolerance. These findings led to the identification of "stress tolerance biomes"—geographic regions characterised by specialized stress tolerance syndromes—and "polytolerance hotspots," regions with frequent coexistence of multiple tolerance strategies. Collectively, this thesis provides a comprehensive synthesis of woody plant adaptations to multiple abiotic stresses, offering a robust conceptual framework and practical tools for understanding and exploring the multidimensional nature of plant stress tolerance strategies.