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Critical conditions for successful regeneration of an endangered annual plant,Cryptantha minima: A modeling approach
Authors:Y Wei  Y Bai  DC Henderson
Institution:1. Deutsches GeoForschungsZentrum GFZ, Telegrafenberg, D-14473 Potsdam, Germany;2. Landesanstalt für Landwirtschaftliche Chemie (710), Universität Hohenheim, Emil-Wolff-Str. 14, D-70593 Stuttgart, Germany;3. Institut für Mineralogie, Leibniz Universität Hannover, Callinstr. 3, D-30167 Hannover, Germany;4. Institute of Soil Landscape Research, Leibniz-Centre for Agricultural Landscape Research (ZALF) e.V., Eberswalder Strasse 84, D-15374 Müncheberg, Germany;5. University of Potsdam, Institute of Earth and Environmental Sciences, Karl-Liebknecht-Str. 24–25, D-14476 Potsdam, Germany;1. Univ. Grenoble Alpes, LTHE, F-38000 Grenoble, France;2. CNRS, LTHE, F-38000 Grenoble, France;3. IRD, LTHE, F-38000 Grenoble, France;4. Centre d''Etudes Spatiales de la BIOsphère (CESBIO), CNES CNRS IRD UPS, OMP, Toulouse, France;5. Météo-France – CNRS, CNRM-GAME UMR 3589, Centre d''Etudes de la Neige, Grenoble, France;6. Swiss Federal Research Institute WSL, Zürcherstrasse 111, 8903 Birmensdorf, Switzerland;7. Gamma Remote Sensing AG, Worbstrasse 225, 3073 Gümligen, Switzerland;8. Karlsruhe Institute of Technology, IMK-IFU, Germany
Abstract:Tiny cryptanthe (Cryptantha minima Rydb.) is an endangered annual plant adapted to prairie sand dunes of Canada. Thermal time and hydrothermal time models were used to quantify the effect of temperature and water potential on seed germination and to relate it to field conditions. Tiny cryptanthe seeds had a base temperature of ?3.9 °C for germination. Final germination percentage was highest at temperatures near the freezing point. Seeds required approximately 130.6 °C d to reach 50% germination under optimal water conditions. Seed germination was sensitive to water stress and large seeds had lower germination than small ones especially at reduced water potentials and higher temperatures. The high potential germination and low seed dormancy indicate that tiny cryptanthe lacks a dormancy mechanism, but the unique germination response to temperature enables it to fully utilize water from spring snowmelt before drought in the summer. Future climate change with higher temperatures could reduce regeneration success of this species unless there is an associated increase in winter and spring precipitation.
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