Home > Publications database > Variation in short-term and long-term responses of photosynthesis and isoprenoid-mediated photoprotection to soil water availability in four Douglas-fir provenances > print

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024 7 _ |a 10.1038/srep40145
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100 1 _ |a Junker, Laura
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245 _ _ |a Variation in short-term and long-term responses of photosynthesis and isoprenoid-mediated photoprotection to soil water availability in four Douglas-fir provenances
260 _ _ |a London
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520 _ _ |a For long-lived forest tree species, the understanding of intraspecific variation among populations and their response to water availability can reveal their ability to cope with and adapt to climate change. Dissipation of excess excitation energy, mediated by photoprotective isoprenoids, is an important defense mechanism against drought and high light when photosynthesis is hampered. We used 50-year-old Douglas-fir trees of four provenances at two common garden experiments to characterize provenance-specific variation in photosynthesis and photoprotective mechanisms mediated by essential and non-essential isoprenoids in response to soil water availability and solar radiation. All provenances revealed uniform photoprotective responses to high solar radiation, including increased de-epoxidation of photoprotective xanthophyll cycle pigments and enhanced emission of volatile monoterpenes. In contrast, we observed differences between provenances in response to drought, where provenances sustaining higher CO2 assimilation rates also revealed increased water-use efficiency, carotenoid-chlorophyll ratios, pools of xanthophyll cycle pigments, β-carotene and stored monoterpenes. Our results demonstrate that local adaptation to contrasting habitats affected chlorophyll-carotenoid ratios, pool sizes of photoprotective xanthophylls, β-carotene, and stored volatile isoprenoids. We conclude that intraspecific variation in isoprenoid-mediated photoprotective mechanisms contributes to the adaptive potential of Douglas-fir provenances to climate change.
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700 1 _ |a Kleiber, Anita
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700 1 _ |a Jansen, Kirstin
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700 1 _ |a Wildhagen, Henning
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700 1 _ |a Hess, Moritz
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700 1 _ |a Kayler, Zachary
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700 1 _ |a Kammerer, Bernd
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700 1 _ |a Schnitzler, Jörg-Peter
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700 1 _ |a Kreuzwieser, Jürgen
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700 1 _ |a Gessler, Arthur
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700 1 _ |a Ensminger, Ingo
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