T
Theodor Keller
Researcher at Swiss Federal Institute for Forest, Snow and Landscape Research
Publications - 7
Citations - 672
Theodor Keller is an academic researcher from Swiss Federal Institute for Forest, Snow and Landscape Research. The author has contributed to research in topics: Photosynthetic capacity & Stomatal conductance. The author has an hindex of 7, co-authored 7 publications receiving 659 citations.
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Impairment of gas exchange and structure in birch leaves (Betula pendula) caused by low ozone concentrations
TL;DR: In this paper, the epidermis and mesophyll of fully developed birch leaves were analyzed by gas exchange experiments and low-temperature SEM: (I) after leaf formation in O3-free and ozonated air, and (II) after transferring control plants into ozonoated air.
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Nighttime exposure to ozone reduces whole-plant production in Betula pendula.
TL;DR: For 20 weeks during the growing season, cuttings of one birch clone (Betula pendula Roth) were exposed in the Birmensdorf fumigation chambers to O(3)-free air (control) or 75 nl ozone (O(3) l(-1) l−1) as mentioned in this paper.
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Differentiation and structural decline in the leaves and bark of birch ( Betula pendula ) under low ozone concentrations
TL;DR: In plants grown in filtered air and transferred into ozone on 20 August, injury symptoms developed faster than in leaves formed in the presence of ozone, and reduced tissue area indicated reduced cambial activity.
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Seasonal growth, δ13C in leaves and stem, and phloem structure of birch (Betula pendula) under low ozone concentrations
TL;DR: Overall, whole-plant production was strongly determined by O3-caused changes in crown structure and began to be limited at O3 doses similar to those of rural sites in Central Europe.
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Branch growth and leaf gas exchange of Populus tremula exposed to low ozone concentrations throughout two growing seasons.
TL;DR: It is concluded that the differences in branch growth between the two growing seasons were caused in part by internal changes in those plant organs (root and basal stem), which had experienced both fumigation periods.